Installation Manual Models 24A715, 24A715M Master Time/Program Clock Document No.
NOTICE To ensure the performance of our products and systems, we may occasionally make technological changes and updates. Therefore, the model number suffixes (A, B, C, etc.) listed in the manual or in the drawings may not always match the model you are using. Unless specifically noted, this will not affect the product or its installation, operation, or service. FCC COMPLIANCE STATEMENT This device complies with Part 15 of the FCC Rules.
FOR UNITS EQUIPPED WITH AN INTERNAL MODEM (24A715M) NOTICE: This equipment complies with Part 68 of the FCC Rules. On the mounting panel of this equipment is a label that contains, among other information, the FCC Registration Number and Ringer Equivalence Number (REN) for this equipment. If requested, provide this information to your Telephone Company. The registration jack USOC for this equipment is (RJ-11). An FCC-compliant telephone cord and modular plug is provided with this equipment.
SUPPLIER’S DECLARATION OF CONFORMITY Place of Issue: St. Charles, IL Date of Issue: August 17, 2001 Dukane Corporation, located at 2900 Dukane Drive, St.
A NOTE ABOUT THE LITHIUM BATTERY The Lithium Battery (coin cell) contained in this product is NOT user-replaceable. When replaced by an authorized Service Center, used batteries should be disposed of according to the manufacturer’s instructions.
Table of Contents SECTION 1—INSTALLATION General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Mounting the Master Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents SECTION 3—FUNCTION LIST Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Quick Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 [*] READ STATUS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents APPENDIX B—SECONDARY CLOCK TYPES Secondary Clock Type Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 Wiring Secondary Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2 Type 01—Synchronous Wired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents APPENDIX C—WIRING DIAGRAMS Wiring Diagrams List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 Wiring the Master Clock for 120Vac or 220/240Vac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2 Wiring Signal Devices to the Master Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents FIGURES 1-1 Master Clock Wall-Mount Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1-2 Hook Mounting the Display Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 1-3 L Brackets for Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 1-4 Plugging Quick Connects into the Terminal Block . . . . .
Table of Contents B-23 Three-Wire Minute Impulse (44th Minute) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-26 B-24 Cincinnati D1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-27 B-25 Dukane Synchronous Wired (24A Series, Obsolete) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-28 B-26 Condor Digital Clocks (Model 2412) . . . . . . . . . . . . . . . .
Section Installation 1 General Information This installation manual covers the Model 24A715 and 24A715M Master Clocks. Both clocks are installed and programmed in similar fashions. The main difference between the clocks is the 24A715M is equipped with a built-in modem capable of communicating with a PC, or for synchronizing with the NIST Atomic Clock.
Optional equipment (ordered separately from Lathem): • Connection cable if the power supply relay PCB is up to 8 feet (2.4 m) from the display unit • Lathem MasterLink programming software to control the master clock from a PC • Standalone modem • Remote schedule selector switch Mounting the Master Clock The master clock is shipped ready to surface mount on a wall. It can also be semi-flush mounted with the power supply recessed into the wall, or installed in a standard 19-inch (48.3 cm) rack.
Surface Mounting To surface mount the master clock: 1. Place the master clock on its back with the display unit facing up and the key pad to the right. 2. Remove the two screws at the top of the display unit mounting plate. 3. Lift the display unit up and away from the backbox. Two rivets at the bottom of the cover will prevent you from lifting it straight up. 4. Unplug the ribbon cable from the back of the display unit to disconnect it from the power supply. 6.
Semi-Flush Mounting The power supply portion of the master clock can be recessed into the wall, so that the display unit is semi-flush with the wall. This should only be done by a qualified technician. To mount the master clock semi-flush: 1. Place the master clock on its back with the display unit facing up and the key pad to the right. 2. Remove the two screws at the top of the display unit mounting plate. 3. Lift the display unit up and away from the backbox.
Using the Installer’s Hooks to Hang the Display Below the Backbox When mounting the clock in either semi-flush or surface installations, the hooks on the back of the display unit mounting plate can be used to hang the display unit below the backbox to allow access for circuit testing and programming. See Figure 1-2. To use the hooks: 1. Remove the two screws securing the display unit to the backbox. 2. Lift the unit up and away from the backbox, leaving the ribbon cable attached.
Rack Mounting The two L-shaped brackets and the box cover supplied with the master clock can be used to install it in a standard 19-inch (48.3 cm) rack. See Figure 1-3 on page 1-7. To rack mount the clock: 1. Place the master clock on its back with the display unit facing up and the key pad to the right. 2. Remove the two screws securing the display unit to the backbox. 3. Lift the display unit up and away from the backbox. Two rivets at the bottom of the cover will prevent you from lifting it straight up.
L Bracket Rectangular Knock Out L Bracket Figure 1-3 L Brackets for Rack Mounting 24A715/24A715M Master Clock Installation Manual 1-7
Wiring the Master Clock This section provides instructions on wiring the power source, secondary clocks, and signaling devices to the master clock. It does not cover the connection of the optional modem, a computer, any RS-485 devices, and a power source for the optional remove schedule selector. Instructions for those devices are provided in Appendix C. Stranded wire is recommended for use inside the power supply box, as it allows a firm connection to the quick connect terminals.
Figure 1-5 Master Clock Terminal Blocks 1. Wire the power source to P4 as shown in either Figure C-1 or C-2 on page C-2. Note: The master clock is shipped set up for 120Vac operation. To wire it for 220/240Vac, change the jumper settings as shown in Figure C-2. —WARNING— DO NOT turn on AC power, and keep the power/relay unit’s toggle switch OFF until you complete the rest of the wiring in this section.
2. Wire the secondary clocks to P1 and/or to P2. See Wiring Secondary Clocks on page B-2 for complete instructions. Note: You may need to add external metal-oxide varistors (MOVs) or diodes to synchronize a specific clock type. See the clock wiring diagrams in Appendix B. 3. Wire the signaling devices to P3. See Typical Signal Device Wiring on page C-3. Note: If the master clock is not connected to any secondary clocks, signaling devices can be wired to P1 and P2. 4.
Section Configuration 2 Setting Up the Master Clock Once the master clock is installed, it is ready for programming. This chapter covers the programming instructions needed to set the master clock for operations. Note: To completely clear the clock of all settings and reset the master clock to its factoryshipped configuration, press the following number sequence on the master clock key pad: 355379768274. This clears all programmed schedules and reinitializes the master clock.
Programming Functions This section explains how to put the master clock in program mode and configure the necessary functions to get the master clock running. For definitions of all functions, key pad commands, and the bell test, see Section 3—Function List. The master clock is normally in clock mode, displaying the date and time. To access program mode, press [#] on the key pad. Pressing [*] stops programming so you can re-enter a setting or quit.
Setting the Date and Time Use the [1]=SET DATE / TIME function to set the date and time. Enter the user password as shown on page 2-2, then follow the key sequences below: Press Display [#] SELECT FUNCTION CODE [1] [1]=SET DATE / TIME [#] ENT. DATE: MM-DD-YYYY [0]...[8] Enter the numbers for the month, date, and year (four-digit year) [#] ENTER DAY-OF-WEEK: D 1=SUNDAY...7=SATURDAY [1]...
Enabling the Relays Use the [6]=ENABLE CIRCUITS function to enable or disable the master clock’s control relays during circuit wiring or maintenance. This function can also hold back clocks to manually adjust for daylight saving time in the fall if the daylight saving function is not in use (see Setting Daylight Saving Time on page 2-7). The ENABLE CIRCUITS function only enables the relays; it does not turn them on. See Manually Activating Bell Controls on page 2-6 to turn on the relays.
Choosing the Clock Types to Synchronize To select a clock type for the master clock to synchronize, use the [2]=SELECT CLOCK CTL function. This allows you to match the master clock to the type of secondary clocks installed. This function configures both clock #1 (relays 7 and 8) and clock #2 (relays 5 and 6), if present. Notes: To check the current master clock configuration, use the quick command [*] while the clock is in clock mode.
Manually Activating Bell Controls Use the [3]=MANUAL BELL CTRL function to test the bell circuits. This function does not require a password. Follow the key sequences below: 2-6 Press Display [#] SELECT FUNCTION CODE [3] [3]=MANUAL BELL CTRL [#] MANUAL BELL CONTROLS 1-2-3-4-5-6-7-8 PRESS AND HOLD [#] TO EXECUTE. [*] TO END [1]...[8] Enter the circuit numbers to be tested, then press and hold [#].
Testing the Bells Use the AUTO BELL TEST function to turn on all bell relays once per minute at the start of each minute. This tests the continuity of the bell wiring circuits. This function does not require a password. 1. If you have entered a password within the last several minutes, deactivate it by following the instructions under Securing the Setup on page 2-9. If you do not, you will toggle the clock between 12- and 24-hour format during this procedure. 2.
Setting Communications The [B]=COMMUNICATIONS function is used to enter data transmission speed and a terminal ID number. Use this function if the clock will be programmed to call the NIST atomic clock, or if you are using the optional Lathem MasterLink software to program the master clock. The clock can be set up using RS-232 (serial), RS-485 (networked), or modem (remote) communications. You must enter the same settings for the Model 24A715M in the programming software.
Securing the Setup At this point you have finished the basic setup of the master clock and it should be up and running. The clock can now be programmed with user-specific settings such as bell schedules and holidays. For detailed information, see the Master Clock User Guide, document 427-07-00047. The master clock automatically exits from program mode if you stop using the key pad for five minutes.
Notes 2-10 24A715/24A715M Master Clock Installation Manual
Section Function List 3 Introduction This chapter list all functions accessible through the master clock key pad. For detailed instructions on these functions, see Section 2—Configuration and the Master Clock User Guide, document 427-07-00047. Quick Commands Quick commands are used to display system information for about two seconds. You can press the quick keys, [*], [1], or [3], when the master is displaying the time and date.
[1] VIEW EDIT KEYS Any time the master clock is in clock mode (displaying time and date), press [1] to see the edit key designations. See Figure 3-2 and Table 3-2. The edit keys are used when programming bell schedules, automatic schedule change dates, and holiday dates. Quick command [1] only displays a listing of the edit keys for reference; you cannot make a selection from this display.
Programming Commands To access the master clock’s programming functions, press [#] to enter program mode. When SELECT FUNCTION CODE appears on the display, the clock is ready for programming. The master clock will automatically exit out of program mode if you have not made a key pad entry for five minutes. [0]=PASSWORD A password is required for most programming functions. To enter either the administrative or user password, press [#][0][#], followed by the six-digit password, then press [#].
[3]=MANUAL BELL CTRL This function does not require a password. Use this function to test bell circuits or to manually ring a bell at an unscheduled time. See Manually Activating Bell Controls on page 2-6. [4]=PROGRAM SCHEDULE Use this function to set bell schedules. Bell schedules are defined as the days and times when the bell circuits will turn on. Enter the password, then press [#][4][#]. See the Master Clock User Guide, document 427-07-00047, for complete instructions.
[7]=DAYLIGHT SAVINGS This function requires the administrative password. Programming the master clock with the appropriate two-digit country code enables it to automatically adjust for daylight saving time. See Appendix A for the country code list, and see Setting Daylight Saving Time on page 2-7.
[B]=COMMUNICATIONS This function requires the administrative password. Use this function to set the master clock’s terminal ID# and baud rate. See Setting Communications on page 2-8. [C]=CHANGE PASSWORD Use this function to change the default user password (000000) to another six-digit number to prevent unauthorized access to the master clock’s programming functions. Keep a copy of this password in a safe place. Enter the current user password, then press [#][9][0][0][0][#].
Appendix Daylight Saving Country Codes A DAYLIGHT SAVING COUNTRY CODES ALBANIA 02 ENGLAND 01 MALTA 02 ANDORRA 02 ESTONIA 02 MONACO 02 ARMENIA 02 FALKLAND ISLANDS 10 NETHERLANDS 02 AUSTRIA 02 FINLAND 02 NEW ZEALAND 11 AZERBJAN 02 FRANCE 02 NORWAY 02 AZORES 02 GERMANY 02 POLAND 02 BAHAMAS 08 GIBRALTER 02 PORTUGAL 02 BALEARIC ISLANDS 02 GREECE 02 ROMANIA 02 BELARUS 02 GREENLAND 07 RUSSIA 02 BELGIUM 02 HAITI 07 SAN MARINO 02 BERMUDA 08 HUNGARY 02
DAYLIGHT SAVING TIME CODES AND DURATION Code Start and end date Code Start and end date 01 Last Sunday in March, 3rd Sunday in October 08 First Sunday in April, last Sunday in October 02 Last Sunday in March, last Sunday in September 09 First day of May, last day of September 03 First day of April, last day of September 10 Second Sunday in September, 2rd Sunday in March 04 First Friday in April, 1st Sunday in September 11 First Sunday in October, 3rd Sunday in March 05 First Friday in Ap
Appendix Secondary Clock Types B SECONDARY CLOCK TYPE CODES Type Description Type Description 01 Synchronous Wired 06 Faraday 01 Lathem Type SS 06 Honeywell ST402A 01 Cincinnati D10 07 Dukane 24F200 Digital (Obsolete) 01 Dukane 24SS Series 07 Dukane 24F750, 24F750A (Obsolete) 01 IBM 77 Series 07 Dukane 24D20, 24D20A, 24D40 01 Simplex 77 Series 08 Rauland 2410 Digital 01 Simplex 93-9 09 Simplex Dual Motor/59 01 Simplex 91-9 10 Simplex Dual Motor/45 01 Simplex 941-9 11
Wiring Secondary Clocks The next several pages contain wiring diagrams and theory of operation for the secondary clocks. These are listed in numerical order according to type code number. Note: All circuits should be fused or protected by a circuit breaker (10A maximum). The 24A715 and 24A715M master clocks are factory-equipped to operate analog clocks on the CLK1 output (relays 7 and 8), and CLK2 output (relays 5 and 6).
Please note that the relay contacts used in the CLK2 circuit are rated at 10 amps. The combined load of the correction circuit and the run circuit should not exceed 8 amps. In general, 20–35 analog clocks can be operated on a single string. This number depends on the clock style and the distances involved. To estimate clock loads for Dukane 24SS series clocks, see the Dukane Analog Clock Installation Guide (document number 402-455).
TYPE 02—Three-Wire Minute Impulse (59th Minute) There are two types of Type 02 secondary clocks: the three-wire minute impulse covered on this page, and the two-wire reverse polarity minute impulse on the following page. Note: For a list of Type 02 clocks, see the chart on the first page of this appendix. From the 58th second to 00 seconds each minute, a 24Vdc pulse is transmitted to the secondary clocks. From the 59th minute through the 49th minute, the pulse is transmitted on both the A and B lines.
TYPE 02—Two-Wire Reverse Polarity Minute Impulse (59th Minute) There are two kinds of Type 02 secondary clocks: the two-wire reverse polarity minute impulse covered on this page, and the three-wire minute impulse on the previous page. Note: For a list of Type 02 clocks, see the chart on the first page of this appendix. Every minute, from the 58th second to 00 seconds, a 24Vdc pulse is transmitted to the secondary clocks.
TYPE 03—Standard Electric Synchronous During normal operation, 120Vac is applied to the run motor. A 15-minute correction signal on the correction motor line causes a 12-hour correction from 5:12:00 to 5:28:00. This occurs twice daily (AM and PM). Run motor power is connected during the 12-hour correction. A 29-second signal is applied to the correction motor line from HH:59:30 to HH:59:59 to cause hourly corrections. During hourly corrections, power is disconnected from the run motor line.
TYPE 04—Standard Electric Time AR-2A Two-Wire, Dual Voltage Each minute, from 58 seconds to 00 seconds, a low-voltage pulse (24Vdc) is transmitted. The secondary clocks receive the pulses until the 59th minute. At this time, from 50 seconds to 00 seconds, a higher voltage pulse (48Vdc) is required to advance to the hour. Manual clock advances and daylight saving advances cause the master clock to transmit 62 pulses (one second ON and one second OFF at 0.5Hz), all at 24Vdc.
TYPE 05—Three-Wire Minute Impulse (58th Minute) Each minute, from the 58th second to 00 seconds, a 24Vdc pulse is transmitted to the secondary clocks. From the 58th minute through the 48th minute, the pulse is transmitted on both the A and B lines. From the 49th minute to the 58th minute, the pulse is transmitted on the A line only. Clocks that reach the 58th minute ahead of the master clock stop, since at this time they respond only to pulses transmitted on the B line.
TYPE 06—Synchronous Wired For a list of Type 06 clocks, see the chart on the first page of this appendix. The clock run motor receives 120Vac continuously, with 120Vac furnished to the clock correction coil for 55 seconds each hour from HH:58:05 to HH:59:00 to cause hourly corrections. Ten 120Vac signals are furnished to the clock correction coil (each for 95 seconds) beginning at 5:05:00, 5:07:00, 5:09:00, 5:11:00, 5:13:00, 5:15:00, 5:17:00, 5:19:00, 5:21:00 and 5:23:00 to cause the 12-hour correction.
TYPE 07—Dukane Digital Clocks For a list of Type 07 clocks, see the chart on the first page of this appendix. —IMPORTANT— Dukane digital clocks MUST be connected to CLK1 (relays 7 and 8) on the master clock. Also, for the master clock to operate Dukane Digital clocks, its factory-installed relay K7 MUST be replaced with a solid-state relay, part number 596-303, available from Dukane in the Model 438-860 kit.
X = Normally open contact DUKANE DIGITAL CLOCKS 24F200, 24F750, 24F750A = To obtain the solid state relay, order Dukane Model 438-860 1 2 3 4 5 6 7 BLANK DSPL. YEL –V +V RED BLK CLK RESET ORN BRN BLANK DSPL. YEL –V +V BLK BRN MASTER CLOCK FIELD CONNECTIONS CLK x CLK1 RED x * RESET DUKANE SOLID-STATE RELAY (596-303) K7 RELAY K8 ORN * 8 BRN (RESET) 2.
TYPE 08—Rauland 2410 Digital Clocks (24Vac and 120Vac) Rauland 24Vac or 120Vac digital clocks initialize to 12:01 AM when first powered up. During normal operation, the clocks maintain time by counting the 60Hz AC line frequency. When the line voltage drops below 120Vac, the digital clocks start rapidly advancing at two minutes per second.
X = Normally open contact I = Normally closed contact 1 = V250LA4 MOV or equal RAULAND 2410 CLOCK MODULES RELAY K5 (K7) RELAY K6 (K8) x I I x CLK2 x 5 6 7 8 BLK 4 BRN 3 BLU 2 BLK 1 BRN FIELD CONNECTIONS BLU MASTER CLOCK 10 ASB MAX.
TYPE 09—Simplex 59th Minute, Dual Motor Power is normally applied to the 1 RPM run motor. Each hour, from HH:58:05 through HH:58:59, power is removed from the run motor and applied to the fast advance motor. During manual clock corrections, power is applied to both motors for 4 minutes and 15 seconds. See Figure B-12. TYPE 10—Simplex 45th Minute, Dual Motor Power is normally applied to the 1 RPM run motor.
TYPE 11—Edwards Dual Motor Power is applied only through relay K6 to the run motor for normal timekeeping. During power interruptions (while clocks are stopped) and during correction, the master clock accumulates the number of seconds. Immediately after power is restored, both relays K6 and K5 operate. Relay K5 applies power to the 10 RPM motor for 1/10th the number of seconds accumulated, causing the clocks to advance to the correct time. After correction, relay K5 opens and relay K6 continues to operate.
TYPE 12—Cincinnati D6 Clocks Normal pulsing is sent out on lines A and C from second 58 through second 00 each minute. From minute 59 through minute 49, line A is positive with respect to line C. From minute 50 through minute 58, except from 4:49 through 5:55 AM and PM, line C is positive with respect to line A. To provide hourly corrections, 20 rapid pulses at 0.
TYPE 13—Two-Wire Pulse Alternating (24Vdc) Every minute from 59 seconds to 00 seconds, a 24Vdc signal is applied on lines A and B, causing the clocks to advance one minute. The polarity of the pulse is alternated each minute to cause A to be positive with respect to B one minute, then B positive with respect to A the next minute, and so on. During power interruptions, the master clock accumulates the number of minutes lost.
TYPE 14—Electronic Coded Clocks Clocks normally run with 120Vac power. For bells or clock correction, the generator prestart relay (K6) first turns on for the signal generator to reach frequency. K6 turns on at the 00 second after a programmed time or manual bell time. Then relay K5 turns on for three seconds, from the 10th to the 13th second, to apply the generator signal (coded cup start signal) onto the 120Vac.
X = Normally open contact I = Normally closed contact 1 = V250LA4 MOV or equal RELAY K5 (K7) RELAY K6 (K8) x I I x x CLK1 OR CLK2 MASTER CLOCK 1 2 3 4 5 6 7 8 FIELD CONNECTIONS START SIGNAL 1 10 ASB MAX.
TYPE 15—Straight Frequency Clock correction and bell circuit operations are generated by sequentially applying various frequencies onto the 120Vac. Each bell and clock correction circuit has its own frequency and a receiver circuit that applies the associated bell or clock frequency (3,510Hz normally used for clock signals). The daylight saving feature advances clocks correctly but has no means, other than normal 12-hour correction, to correct secondary clocks at 2:00 AM.
TYPE 16—Three-Wire Minute Impulse (59th Minute) with 12-Hour Correction There are two types of type 16 secondary clocks: the three-wire minute impulse covered on this page, and the two-wire reverse polarity minute impulse on the following page. Each hour from the 59th minute through the 49th minute, a two-second pulse is transmitted on both the A and B lines, starting at the 58th second and ending at 00 seconds, causing all clocks to advance each minute.
TYPE 16—Two-Wire Reverse Polarity Minute Impulse (59th Minute) with 12-Hour Correction There are two types of type 16 secondary clocks: the two-wire reverse polarity minute impulse covered on this page, and the three-wire minute impulse on the previous page. Each hour, from the 59th minute through the 49th minute, a two-second pulse is transmitted between lines AB and PC (with AB positive with respect to PC), starting at the 58th second and ending at 00 second. This causes all clocks to advance each minute.
TYPE 17—Standard Electric Time AR-3 Three-Wire Impulse Each minute from 58 seconds to 00 seconds, a pulse is transmitted on line. The secondary clocks receive the pulses on line A until the 58th minute. At this time, from 50 seconds to 00 seconds, a pulse on line B is required to advance to the 59th minute.
TYPE 18—National Synchronous Wired For a list of Type 18 clocks, see the chart on the first page of this appendix. Relay K5 is normally operated to power the clock run motors. Each hour from HH:00:00 to HH:00:28, relay K6 is operated to power the clock correction coils for 28 seconds and cause hourly corrections. Every 12 hours, from 6:00:00 to 6:27:27, relay K6 is again operated to power the clock correction coils for 27 minutes, causing 12-hour correction.
TYPE 19—Stromberg Synchronous Wired (56th Minute) For a list of Type 19 clocks, see the chart on the first page of this appendix. This clock is normally operated by 120Vac/24Vac. Relay K5 is normally operated to supply motor power. Relay K6 activates each hour from HH:56:10 to HH:56:18, causing an eight-second signal to be transmitted on the correction line for hourly correction.
TYPE 20—Three-Wire Minute Impulse (44th Minute) Every minute, from the 58th second to 00 seconds, a 24Vdc pulse is transmitted to the secondary clocks. From the 44th minute through the 34th minute, the pulse is transmitted on the A and B lines. From the 35th minute to the 44th minute, the pulse is transmitted on the A line only. Clocks that reach the 44th minute ahead of the master clock stop, since at this time they respond only to pulses transmitted on the B line.
TYPE 21—Cincinnati D1 Every minute, from HH:MM:58 to HH:MM:00, relay K6 is activated, causing an output on line A for two seconds. During minutes 07 through 58 only relay K6 activates, causing the output on line A to be 24Vdc. During minutes 59 through 06, relay K5 is also activated, together with relay K6, causing the output on line A to be 60Vdc to advance all clocks. Clocks that reach the 59th minute ahead of the master clock stop, since at this time they respond only to the 60Vdc pulses.
TYPE 22—Dukane Synchronous Wired (24A Series, Obsolete) During normal operation, either 24Vac or 120Vac is furnished to the clock run motor through relay K6. Power is removed from the run motor during power failures, while K6 de-energizes during fall daylight saving changes. Each hour from HH:57:00 to HH:57:55, relay K5 energizes to furnish a 24Vdc signal to the correction coil.
TYPE 23—Condor Digital Clocks (Model 2412) For a list of Type 23 clocks, see the chart on the first page of this appendix. Condor digital clocks initialize to 12:00 AM when power is first applied. During normal operations, the clocks maintain time by counting the 60Hz AC line frequency. When the line voltage drops to approximately two-thirds normal level, the clocks start rapidly advancing at a rate of two minutes per second.
TYPE 24—Edwards Synchronous Wired Clocks, Type E1 During normal operation, 120Vac is applied between the run motor and common lines to operate the clocks until the 58th minute. At HH:58:00 of each hour, the 120Vac is replaced by 120Vdc between the correction and common lines for a period of 200ms, with the common line being positive. This pulse initiates hourly corrections for clocks that are less than 60 minutes slow.
TYPE 27—Simplex 2310 Dual Motor Type 27 secondary clocks have the same hourly corrections as type 09, with the addition of 12-hour corrections as for type 03. Power is normally applied to the 1 RPM run motor. Each hour, from HH:58:05 through HH:58:59, power is removed from the run motor and applied to the fast advance motor. During manual clock corrections, power is applied to both motors for 4 minutes and 15 seconds. During normal operation, 120Vac is applied to the run motor.
Notes B-32 24A715/24A715M Master Clock Installation Manual
Appendix Wiring Diagrams C Wiring Diagrams List This appendix contains wiring information and diagrams for the installation of the Dukane 24A715/M Master Clock: C-1 Wiring the 24A715/M for 120Vac Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2 C-2 Wiring the 24A715/M for 220/240Vac Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2 C-3 Typical Signal Device Wiring—Terminal Block P1 . . . . . . . . . . . . . . . . .
Wiring the Master Clock for 120Vac or 220/240Vac The master clock is factory-shipped ready for 120Vac. Figure C-1 shows the correct wiring for 120Vac operation. Figure C-2 shows the correct wiring and adjusted jumper settings for 220 and 240Vac operation. All circuits should be fused or protected by a circuit breaker (10-amp maximum). 120Vac External Sync Input (Opt.
Wiring Signal Devices to the Master Clock Typically, signal devices (such as bells or lights) are wired to terminal block P3. If no secondary clocks are connected to terminal blocks P1 or P2, signal devices can also be wired to those blocks. See the figures below. Zone 7A and 7B operate together, and 5A and 5B operate together. You can use either of these circuits for bells. All circuits should be fused or protected by a circuit breaker (10A maximum).
Wiring the Communications Terminal Block The communications terminal block is on the back of the display unit. See Figure C-6. It is used to connect the optional modem, a computer, any RS-485 devices, and a power source for the optional remove schedule selector.
Figure C-7 RS-232 Cable for Permanent Connection to the Communications Terminal Block RS-485—Terminal block pair for RS-485 communications with an IBM-compatible computer running the optional Lathem MasterLink programming software and SWIFT (RS-485 to RS-232 converter). MODEM—Modular connector for modem use. The optional internal modem can be used to dial out to the Atomic Clock at Fort Collins, Colorado, USA, or for a remote site using the optional Lathem MasterLink programming software.
Wiring RS-485 Time Synchronization Devices Up to 30 RS-485 Data Synchronization Devices (DSDs) can be connected to the sync terminals. Since the SYNC IN port can send as well as receive, 30 extra devices can be connected. If more than 60 DSDs are to be connected, another master clock must be used as a booster.
Wiring the 12 Volt AC Out Terminals The 12 Volt AC Out Terminals connect to a non-regulated 12V 250mA power source and are used with the optional remote schedule selector (available from Lathem) when in close proximity to the master clock. Contact Lathem Time Corporation for details. —WARNING— This circuit is not fused separately. Attaching devices with a higher current load may damage the master clock.
Connecting a Computer to the Front Access Port A computer can be temporarily connected to the master clock via the front access port. See the figure below to make a cable for this purpose.
D D12 K5 K6 K7 K8 D3 D4 D5 D6 D11 D10 D9 K4 K3 C3 K2 C4 C5 K1 Appendix Power Supply Schematic Figure D-1 Power Supply Schematic for the 24A715/M Master Clock 24A715/24A715M Master Clock Installation Manual D-1
Notes D-2 24A715/24A715M Master Clock Installation Manual
DUKANE CORPORATION COMMUNICATIONS SYSTEMS DIVISION - 2900 Dukane Drive, St. Charles, Illinois 60174 © 2001. Printed in USA. All specifications subject to change without notice.
