Series 942 User's Manual TOTAL CUSTOMER CUSTOMER SATISFACTION SATISFACTION 1/4 DIN Microprocessor-Based Ramping Control Watlow Controls 1241 Bundy Blvd., P.O. Box 5580, Winona, MN 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507 W942-XUMN Rev. R00 June, 1995 Supersedes: W942-MA40-9305 $10.00 Made in the U.S.A.
WATLOW Series 985 User's Manual Appendix
Page 4 4 5 5 Item Chapter 1 Starting Out With The Watlow Series 942General Description Opening the 942 Set the DIP Switches 6 6 6 7 8 8 9 11 15 17 20 Chapter 2 How To Install And Wire The Series 942System Planning Installation Information Dimensional Information Wiring The Series 942 Sensor Installation Guidelines Input Wiring Output 1 Wiring Output 2 Wiring Auxiliary Wiring System Wiring Example 21 Chapter 3 How To Use the Keys And Displays 22 22 23 28 Chapter 4 How To Setup The Series 942 Entering
Starting Out Starting Out Chapter 1 The Watlow Series 942, A Microprocessor-Based Control Dual OutputsPID or ON/OFF, User Selectable Single Input Type J, K, T, N, R, S, B, C or Pt2 Thermocouple, RTD or Process Output 1 Heat or Cool Output 1 Auto-tuning (Heat only) Output 2 Heat, Cool or None RS-422A, RS423A (RS-232C compatible), or EIA-485 Optional Computer Interface Dual Alarms/Events Retransmit Output (Up to 10 Slaves) Figure 1 Series 942 Input and Output Overview.
Starting Out Starting Out How to Open the 942 Before going further, open the Series 942 and pull the control chassis from its case. Here's how: The control chassis fastens to the case with a single standard screw located on the Figure 2 How to Open the Series 942. ! ! LOCK Three strip connector plugs, in the rear of the control chassis, feed power and signals through the back of the case to the terminal strips. These plugs will let go as you pull. WARNING: The front panel screw turns 90° only.
Installation Chapter 2 How to Install and Wire the Series 942 System Planning This chapter tells you how to install the Series 942. All mounting and wiring information is right here. Because Watlow controls are thoroughly tested and "burned in" before leaving the factory, the Series 942 is ready to install when you receive it. But before you begin working, read through this chapter to gain an understanding of the entire installation. Consider sensor installation carefully.
Dimensions 3.81" sq. (97 mm) 3.81" sq. (97 mm) Figure 4 Series 942 Dimensions. 6.0" (152 mm) 0.92" (23 mm) Bezel 3.8" (97 mm) Mounting Bracket 3.6" ± 0.015" (90 mm ± 0.381) 3.622 3.62" to to 3.653 3.65" (92.00 to 92.79mm) (92 to 93 mm) Panel Cutout Your Panel Your Panel Thickness Thickness: 0.06" to 0.25" to 0.25 (1.520.06 to 6.35mm) (1.524 to 6.35mm) Install and Wire, Chapter 2 k 3.62" to 3.65" 3.622 to 3.653 3.63" X 3.63" (92 to 93 to mm) 3.625 x 3.625 (92.00 92.79mm (92.08 X 92.08 mm) (92.
Power Wiring How to Wire the Series 942 NOTE: For 50 or 60Hz operation, no adjustment or jumper placement is necessary. The Series 942 wiring is illustrated by model number option. Check the terminal designation sticker on the control and compare your model number to those shown here and to the model number breakdown in the Appendix of this manual. Series 942 internal circuits appear "inside" the line drawing of the 942, while connections and terminal designations appear "outside" the line drawing.
Input Wiring Thermocouple Input Model # 942A - 1 _ _ _ - _ 000 942A - 2 _ _ _ - _ 000 942A - 3 _ _ _ - _ 000 942A - 4 _ _ _ - _ 000 Figure 8 Thermocouple Input Wiring. 7 9 + - You must use an isolated or ungrounded thermocouple, if an external device with a nonisolated circuit common is connected to the 4-20mA or 0 - 5VDC output. Extension wire for thermocouples must be of the same alloy as the thermocouple itself to limit errors.
Input Wiring When using a process input such as 0 - 5VDC or 4 - 20mA, the rL and rH settings scale the display to match the measured range of the process signal. An example of this is: A pressure transducer operates over a range of 0 - 300 PSI, delivering a 4 - 20mA output signal for this range. By setting rL = 0 and rH = 300, the Series 942 now displays a direct reading of pressure. 0 - 5VDC Process Input Model # 942A - 2 _ _ _ - _ 000 Figure 10 0 - 5VDC Process Input Wiring.
Output 1 Wiring Solid State Relay With Contact Suppression, Output 1 Model # 942A - _ B _ _ - _ 000 Figure 12 Solid State Relay With Contact Suppression, Output 1 Wiring. Solid State Relay, Form A, 0.5 Amp External Load 17 N.O. L2 18 COM. L1 Fuse Solid State Relay With Contact Suppression Watlow's solid state relay changes state at zero volts, which is "zero-cross switching.
Output 1 Wiring Mechanical Relay, 6 Amp, Form C, Output 1 Model # 942A - _ D _ _ - _ 000 Figure 14 6 Amp Mechanical Relay, Output 1 Wiring. Mechanical Relay, Form C, 6 Amp 16 COM. Fuse L1 17 N.O. External Load 18 N.C. NOTE: This output is supplied with an arc suppression snubber across the output terminals. High impedance loads may remain energized even though the output device is turned OFF. L2 Mechanical Relay The electromechanical relay is an electrical and mechanical device with moving parts.
Output 1 Wiring Process, 4 - 20mA, Output 1 Model # 942A - _ F _ _ - _ 000 Figure 16 Process, 4 - 20mA, Output 1 Wiring. Process, 4-20 mA, Non-Isolated + I DC 17 + 18 - - External Load Process Output Proportional value determined by the control to balance the sensor input and set point. This value will fall between 4 - 20mA depending on the thermal characteristics of the system. Load impedance is 600Ω maximum.
Output 1 Wiring Process, 0 - 5VDC, Output 1 Model # 942A - _ H _ _ - _ 000 Figure 18 Process, 0 - 5VDC, Output 1 Wiring. Process, 0-5VDC, Non-Isolated + 17 + - 18 - External Load Process Output Proportional value determined by the control to balance the sensor input and set point. This value will fall between 0 - 5VDC depending on the thermal characteristics of the system. Load impedance is 10KΩ minimum.
Output 2 Wiring Solid State Relay With Contact Suppression, Output 2 Model # 942A - _ _ B _ - _ 000 Solid State Relay, Form A, 0.5 Amp 14 N.O. Fuse L1 L2 15 COM. Figure 20 Solid State Relay With Contact Suppression, Output 2 Wiring. L1 L2 External Load Solid State Relay With Contact Suppression Watlow's solid state relay changes state at zero volts, which is "zero-cross switching.
Output 2 Wiring Mechanical Relay, 6 Amp, Form A, Output 2 Model # 942A - _ _ D _ - _ 000 Figure 22 6 Amp Mechanical Relay, Output 2 Wiring. Mechanical Relay, Form A, 6 Amp 14 N.O. External Load 15 COM. L1 L2 L1 L2 Fuse NOTE: This output is supplied with an arc suppression snubber across the output terminals. High impedance loads may remain energized even though the output device is turned OFF. Mechanical Relay The electromechanical relay is an electrical and mechanical device with moving parts.
Auxiliary Wiring For more information on alarms, alarm jumper selection and events, see Chapter 6. Mechanical Relay The electromechanical relay is an electrical and mechanical device with moving parts. When power is applied to the relay solenoid, contact closure is created through movement of the "common" contact of the relay. Off state impedance is 20KΩ minimum. Mechanical Relay, 6 Amp, Single Form A or B, Auxiliary Output Model # 942A- _ _ _ 1 - _ 000 Figure 24 Auxiliary Option 1 Wiring.
Auxiliary Wiring Mechanical Relay The electromechanical relay is an electrical and mechanical device with moving parts. When power is applied to the relay solenoid, contact closure is created through movement of the "common" contact of the relay. Mechanical Relay, 6 Amp, Form A or B/0 - 5VDC Retransmit Model # 942A- _ _ _ 3 - _ 000 Figure 26 Auxiliary Option 3 Wiring.
Auxiliary Wiring Retransmit Output When using a retransmit output such as 0 - 5VDC or 4 - 20mA, the rL and rH settings scale the range of the retransmit output. An example of this is: By setting rL = 0, rH = 1000 and Ot4 = PrOC a process value of 500 will result in a retransmitted signal of 2.5VDC or 12mA. 0 - 5VDC Retransmit, Auxiliary Output Model # 942A- _ _ _ 5 - _ 000 Figure 28 Auxiliary Option 5 Wiring. Process, 0-5VDC non-isolated - 24 - 25 + + External Load Load impedance 10KΩ mimimum.
Wiring Example CAUTION: All wiring and fusing must conform to the National Electric Code NFPA70. Contact your local board for additional information. Failure to observe NEC safety guidelines could result in injury to personnel. Figure 30 System Wiring Example ! WARNING: Watlow mercury relays are designed to be used only with resistive loads.
Keys/Displays Chapter 3 How to Use the Keys and Displays After 1 minute with no key activations, the control reverts to the process value in the Upper display and the set point in the Lower display, except when in the RUN menu. Upper Display Red, 0.56" (14 mm) high, seven segment, four digit LED display, indicating process variable (such as actual temperature) in addition to parameter values, or an open sensor. When powering up, the Process display will be blank for 8 seconds.
Setup Chapter 4 How To Setup The Series 942 Setting up the Series 942 is a simple process. First configure the 942's features to your application in the Setup Menu, enter values in the Operating Menu, and program your control. Use the MODE key to move through the menus and the UP/ DOWN keys to select data. At this point, enter the Calibration menu, and select US or SI under the dFL parameter if necessary. Rate, reset and °F appear with US, and integral, derivative and °C appear with SI. See Appendix III.
Setup Setup Parameters When you are at the top of the menu, the Series 942 displays the user level of operation in the Upper display, and the LOC parameter in the Lower display. When you press the MODE key, the value of the next parameter appears in the Upper display, and the parameter appears in the Lower display. Lock: Selects the level of operator lockout. Range: 0 - 3 Default: 0 LOC LOC 0: All operating parameters may be viewed or changed. LOC 1: Locks out the PID parameters.
Setup Ot1 HYS1 Ot2 HYS2 Ot3 AL1 LAt1 HYS3 SIL 24 Output 1: Selects the output action for the primary output. Action in response to the difference between set point and process variable. Select ht (heat) for reverse acting or select CL (cool) for direct acting. Range: ht, CL Default: ht Hysteresis 1: Selects the switching hysteresis for Output 1 when Pb1 = 0 (ON/ OFF). See Page 29 for the Pb1 parameter. Range: 1°F - 999°F 0.1°F - 99.9°F Default: 3°F 1°C - 540°C 0.1°C - 54.0°C 1Unit - 999 Units 0.
Setup Output 4: Selects Output 4 as an alarm (AL) or event (Ent) if Output 4 is an auxiliary output. Selects Output 4 as retransmit of Process (PrOC) or Set Point (StPt) if Output 4 is a retransmit output. Hardware must also be present. Scaling of the retransmit output is determined by rL and rH. Auxiliary Output: Range: AL, Ent, no Default: AL Retransmit Output: Range: PrOC, StPt, no Default: PrOC Ot4 Alarm 2: Determines whether the alarm type for Output 4 is process or deviation.
Setup PStr Profile Start: Selects whether the profile starts at the current set point value or the current process value. Range: Proc or StPt Range: StPt bAud Baud: Represents the current baud rate for serial communications. This parameter appears if your Series 942 has communications. Range: 300, 600, 1200, 2400, 4800, 9600 Default: 1200 dAtA Prot Addr LOg Int tAg Data: Allows the user to select the data bits and parity for communication.
Use this page as a master copy for configuring your Series 942. Do not enter any values here; make photocopies instead. Setup Table 2 Setup Menu Parametersand Descriptions. Setup Parameters Range Factory Default LOC 0 to 3 0 In J, K (appears as H), t, n, c, r, S, b, Pt2, rtd1, rtd.1, 0-5, 420 Dependent on model number. J or r dEC 0, 0.0, or 0.00 Dependent on input type. 0 C_F C or F Will not appear if In = 0-5 or 420. F rL rL to rH Input selection dependent.
Operation Operation Menu In the Operation menu, the 942 operates as a digital set point control. Select a set point and the 942 attains that value on a non-linear ramp. If your unit has auxiliary outputs programmed as events, they can be selected as ON or OFF. All outputs are turned OFF when set point is set to OFF. NOTE: The Upper display always returns to the process value after 1 minute without key strokes. M [Set Point] [SP] Figure 34 The Operation Menu.
Operation Ent2: Select whether Event 2 (Output 4) is ON or OFF. When a profile is complete or has been put on hold, it will hold at its previous state. This parameter only appears if Ot4 = Ent, and your unit has auxiliary outputs. For more information on events see Chapter 6. Range: On or OFF Default: OFF Ent2 Proportional Band 1: A proportional band expressed in degrees or process units, or % of span, within which a controller proportioning function is active for Output 1.
Operation A1HI Alarm 1 High: This parameter represents the high process alarm or high deviation alarm for Alarm 1. This parameter appears if your unit has an auxiliary output and Ot3 = AL. See the model number. If AL 1 = Pr: Range: A1LO to rH Default: rH AL 1 = dE: Range: 0 to -999°F/0 to -999°C/0 to -999 Units Default: -999°F A2LO Alarm 2 Low: Represents the low process alarm or low deviation alarm for Alarm 2. Appears if your unit has an auxiliary output and Ot4 = AL. See the model number.
PROGRAM Menu Chapter 5 How to Program & Run the Series 942 We begin this chapter by introducing the Program menu. Each parameter is clearly defined. A description of a few Series 942 features follows, along with a sample profile to experiment with programming the Series 942. You will quickly grasp the necessary terms and concepts by entering and observing your profiles. Enter your profile values in the Master Step Chart at the end of the chapter. PROGRAM Menu Create your profiles here in the Program menu.
Program Program Parameters Prog (YES) StEP Step: Represents the current step of the profile to be edited or viewed. When selecting Step 1, you will not see the JL step type. Range: 1 to 24 Default: 1 then automatic increment StYP Step Type: Choose from four different step types. Range: StPt, SoAh, JL or End Default: End (StPt) Set Point Step (StPt) : The following parameters are associated with the set point step. SP Set Point: Represents the temperature the system tries to achieve.
Program Soak (SoAh) : The following parameters are associated with the soak step. Hour: The number of hours, in combination with the Min and SEC parameters, equaling total step time to achieve the temperature under the SoAh step type. This parameter only appears if PtYP = ti. Range: 0 to 23 Default: 0 Minutes: The number of minutes, in combination with the HOUr and SEC parameters, equaling total step time to achieve the temperature under the SoAh step type. This parameter only appears if PtYP = ti.
RUN Menu Running a Series 942 Profile You can run your Series 942 profile from anywhere except the Setup menu. Press the HOLD/RUN key. The RUN LED begins flashing, and the lower display flashes and asks what StP (step) to begin on. Use the UP/DOWN key to enter the step and press the HOLD/RUN key once again, your profile begins, and the RUN LED is lit. If the HOLD/RUN key is not pressed twice within 1 minute, the RUN function will abort. While the profile is RUNning, you can only view the RUN menu.
Master Step Chart Chart 1 - Master Step Chart Step # √ Step Type StPt Make photocopies, keep original clean.
Events Event Outputs One of the features of the Series 942 is its capability for two event outputs. An "event output" is simply a pre-programmed ON/OFF event per profile step. The event may turn any number of peripheral devices ON or OFF to assist you in controlling your process, system or environment. For instance, in an environmental chamber, you might wish to circulate air at a given time in your profile for one or more steps.
Jumploop Set Point Figure 37 Guaranteed Soak Deviation Example Set Point Guaranteed Soak Deviation Window Around Set Point Time Multiple Profiles The Series 942 is a single profile control, but can be programmed for multiple profiles. To do this, enter your first profile; the next step you enter following the End step is the start of another profile. You can continue entering profiles until you run out of steps, remember there are a total of 24 steps. Jumploop The Series 942 can only jump backwards.
This is a sample program. Depending on your application and parameter settings, your system may not respond like this. Sample Program Programming a Ramping Profile Our first step in programming is to make a short ramp and soak profile. Step 1 initializes the set point to a known starting point for the ramp, Step 2 is a short ramp, and Step 3 is a soak step, which holds the programmed set point constant for the programmed time. Step 4 is an end step signalling the end of the profile. 1.
Sample Program The RUN LED is continually lit. The upper display shows the PROCESS value, and the lower display shows the current set point. You may step through the Run menu parameters with the MODE key to see what the step type is and what the parameters are set at. At any time you may press the HOLD/RUN key to stop the profile. To resume running the profile where it was stopped, press the HOLD/RUN key once; the RUN LED begins flashing.
Tuning Chapter 6 How to Tune and Operate Tuning - Automatic Auto-tuning: The Series 942 can automatically tune the PID parameters to fit the characteristics of your particular thermal system. The auto-tuning procedure operates on a thermal response value — slow, medium, or fast. Use the slow thermal response when your process does not need to reach set point too rapidly, or if it usually does not exceed set point. A fast thermal response produces a rapid temperature change over a short period of time.
Tuning Tuning - Manual For optimum control performance, tune the Series 942 to the thermal system. The tuning settings here are for a broad spectrum of applications; your system may have somewhat different requirements. NOTE: This is a slow procedure, taking from minutes to hours to obtain optimum value. 1. Apply power to the Series 942 and enter a set point. Begin with these Operation Parameters: Pb1 = 1, rE1/It1 = 0.00, Ct1 = 5, rA1/dE1 = 0.00, CAL = 0, AUt= 0. 2.
Auxiliary Changing the Position of an Auxiliary Jumper Whenever you change the position of a jumper, follow this procedure: 1. Remove power from the Series 942. Turn the front panel screw 90° counterclockwise. 2. Grip the front panel bezel and pull it straight out from the control case. The control chassis will come out of the case as you pull the bezel. 3. Set the jumper to the position you want. See Figure 38 for jumper location. 4. Return the control chassis to the case.
Alarms A Deviation alarm alerts the operator when the process strays too far from set point. The operator can enter independent high and low alarm settings. The reference for the deviation alarm is the set point. Any change in set point causes a corresponding shift in the deviation alarm. Example: If the set point is 100°F, and a deviation alarm is set at +7°F as the high limit, and -5°F as the low limit, the high alarm trips at 107°F, and the low alarm at 95°F.
Error Codes Error Code Messages ! Four dashes, "- - - -", in the upper display indicate a Series 942 error. • The error code is visible in the lower display. Figure 41 Error Code Display Example ! WARNING: Electrical noise or a noise event, vibration or excess environmental moisture or temperature may cause Series 942 errors to occur. If the cause of an error is not otherwise apparent, check for these.
Errors/Outputs Error Code Actions • Error codes Er 1, Er 2, Er 3, Er 6, and Er 7 will result in these conditions: • Control outputs turn OFF. • The auxiliary output (if present and programmed as an alarm) will be in the alarm state (LED lit). If programmed as an event, the output turns OFF. • The Upper display will read "- - - -". • The Lower display indicates the error code. • The HOLD/RUN and MODE keys are inactive. The UP/DOWN keys may be used together to enter the Setup Menu.
Specifications Appendix 1 Control Mode • • • • • • • NOTE: An X applies to either Hysteresis 1, 2, 3, or 4. 24 step ramping control or programmer. Simple, non-ramping set point. Single input, dual outputs. Optional dual auxiliary outputs, selectable as alarms or time based events. Optional retransmit of set point or process variable. RS-422A, RS-423A, or EIA-485 data communications available.
Specifications Secondary Output (Heat, Cool or None) • Solid state relay, Form A 0.5A @ 24VAC min., 264VAC maximum, optoisolated, zero cross switching. Off state impedance is 20KΩ minimum for 942A-XBXX-X0000 units, and infinite impedance for 942A-XKXX-X000 units. • Electromechanical relay, Form A, 6A @ 120/240VAC, 6A @ 28VDC, 1/8 hp. @ 120VAC, 125VA @ 120VAC. Off state impedance is 20KΩ min. • Switched DC, Open collector, 500Ω minimum load resistance, 1KΩ load, 9mA minimum, 22mA maximum, non-isolated.
Model No. Series 942 Model Number Information The Series 942 Model Number, listed on your unit sticker, is defined below. 9 4 52 A Control Series 942 = 000 1/4 DIN, single input, dual output, dual auxiliary outputs, dual digital displays. Inputs Type 1 = Type J, K, T, N, C, PT 2 thermocouple 2 = Type J, K, T, N, C, PT 2 thermocouple, RTD 1°, 4 - 20mA, 0-5VDC 3 = Type J, K, T, N, C, PT 2 thermocouple, RTD 0.
Install - Wire Appendix 2 Noise and Installation Guidelines Installation Guidelines For Preventing Noise For improved electrical noise immunity, install the Series 942 as far away as possible from motors, relays, and other similar electrical noise generators. Do not run low power (sensor input) lines in the same bundle as AC power lines. Grouping these lines in the same bundle can create electrical noise interference which may result in error codes in the Series 942.
Wiring Guide • Another important practice is to look at the system layout; identify and locate electrical noise sources such as solenoids, relay contacts, motors, etc. Route the wire bundles and cables as far away as possible from these noise sources. Don't mount relays or switching devices close to a microprocessor control. Don't have phase angle-fired devices in the same electrical enclosure or on the same power line with the control.
Wiring Guide How To Eliminate Noise • Use "snubbers" ("QUENCHARC™") to filter out noise generated by devices such as relays, relay contacts, solenoids, motors, etc. A snubber is a simple filter device using a 0.1µf, 600 volt, non-polarized capacitor in series with a 100 ohm, 1/2 watt resistor. The device can be used on A.C. or D.C. circuits to effectively dampen noise at its source. • The general purpose Watlow snubber, described above, is 0804-0147-0000. For other "QUENCHARC" sizes contact: PAKTRON P.O.
Noise Guidelines How to Check for Ground Loops To check for ground loops, disconnect the ground wire at the ground termination. Measure the resistance from the wire to the point where it was connected. The ohmmeter should read a high ohm value. If you have a low ohm value across this gap, there is at least one ground loop present in your system. Or check for continuity; your reading should be "open." If you do find continuity, you must now begin looking for the ground loops.
Noise Guidelines Line Filtering Configurations For Controls These three diagrams show you filter configurations for removing input power noise. Choose the one best suited for your system. For very dirty or critical applications - use a microcomputer-regulated power supply or Uninterruptable Power Supply (U.P.S.). Don't fasten common mode line filters or filters with metal cases to metal that is at ground potential. This prevents ground loops and maintain filter effectiveness. D.M.
Calibration Appendix 3 Before attempting to calibrate, make sure you have the proper equipment called for in each procedure. Entering the Calibration Menu In the Calibration Menu, various input signals must be supplied in order for the control to go through its auto calibration. The calibration menu can only be entered from the LOC parameter in the Setup menu. Press the UP/DOWN keys simultaneously for 3 seconds (± 1 second). The CAL parameter appears in the lower display with "no" in the upper display.
Calibration Calibration Menu CAL ( ) YES to calibrate, No skips to display test. tCL ( ) Input 0.00mV for low thermocouple input. tCH ( ) Input 50.00mV (or 16.035 for r, S or b units) for high thermocouple input. tC ( ) Connect a "J" T/C compensator, with inputs shorted. T/C units only. rLO ( ) rHI ( ) Connect the JIS RTD high resistance per model number. 0 U ( ) Set the voltage source to 0.000 volts. 5 U ( ) Set the voltage source to 5.000 volts.
T/C Calibration Thermocouple Field Calibration Procedure Before attempting to calibrate, make sure you have the proper equipment called for in each procedure. Equipment Required • • NOTE: Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35. Type "J" or "R" reference compensator with reference junction at 32°F/0°C, or Type "J" or "R" thermocouple calibrator set at 32°F/0°C.
RTD Calibration RTD Field Calibration Procedure Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure. Equipment Required • 1KΩ precision decade resistance box with 0.01 ohms resolution. Setup And Calibration 1. Connect the AC line voltage L1, L2, and ground to the proper terminals of the 942. See Chapter 2. 2. Connect the decade resistance box to Terminal #4, 5 and 6 on the terminal strip.
0 - 5 Volt Input 0 - 5 Volt Input Field Calibration Procedure Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure. Equipment Required • Precision voltage source 0-5 volt minimum range with 0.001 volt resolution. Setup And Calibration NOTE: Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35. 1.
4-20mA Input 4-20mA Input Field Calibration Procedure Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure. Equipment Required • Precision current source 0-20mA minimum range with 0.01 mA resolution. NOTE Setup And Calibration 1. Connect the AC line voltage L1, L2, and ground to the proper terminals on the Series 942. Jumper for correct line voltage. See Chapter 2. 2. Connect the voltage/current source to Terminal #1 and #3.
0-5/0-10 Volt Output 0-5 or 0-10 Volt Output Field Calibration Procedure Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure. Equipment Required • • 20KΩ, 1/4 watt, 10% resistor 4 1/2 digit Digital Multimeter. Setup and Calibration 1. Connect the AC line voltage L1, L2, and ground to the proper terminals of the 942. See Chapter 2. NOTE Before calibration on an installed control, make sure all data and parameters are documented.
0-20/4-20mA Output 0-20/4-20mA Output Field Calibration Procedure Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure. Equipment Required • • 470Ω, 1/2 watt 10% resistor. 4 1/2 digit Digital Multimeter. Setup and Calibration 1. Connect the AC line voltage L1, L2, and ground to the proper terminals of the 942. See Chapter 2. 2.
0-5V Retransmit 0 - 5 Volt Retransmit Field Calibration Procedure Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure. Equipment Required • • 20KΩ, 1/4 watt, 10% resistor. 4 1/2 digit Digital Multimeter. Setup and Calibration NOTE Before calibration on an installed control, make sure all data and parameters are documented. See the Setup and Operation Tables, and the Master Step Chart, Pages 27, 30 and 35. 1.
4-20mA Retransmit 4-20mA Retransmit Field Calibration Procedure Before attempting any calibration procedure, make sure you have the proper equipment called for in each procedure. Equipment Required • • 470Ω, 1/2 watt 10% resistor. 4 1/2 digit Digital Multimeter. Setup and Calibration 1. Connect the AC line voltage L1, L2, and ground to the proper terminals of the 942. See Chapter 2. 2.
