SCF Series Installation and Operation Manual
THE SCF SUB-MICRO DRIVE INPUT POWER TERMINALS ELECTRONIC PROGRAMMING MODULE (EPM) 3-DIGIT LED DISPLAY PROGRAMMING BUTTONS CONTROL TERMINAL STRIP OUTPUT (MOTOR) TERMINALS DC BUS TERMINALS Safety Information All safety information given in these Operating Instruction have the same layout: Signal Word! (characterizes the severity of the danger) Note (describes the danger and informs on how to proceed) Signal Words Icon Warning of hazardous electrical voltage DANGER! Warning of a general danger WARNING
Table of Contents 1.0 GENERAL.........................................................................................2 2.0 SCF DIMENSIONS...........................................................................4 3.0 SCF MODEL DESIGNATION CODE................................................7 4.0 SCF SPECIFICATIONS....................................................................8 5.0 SCF RATINGS..................................................................................9 6.
1.0 GENERAL 1.1 PRODUCTS COVERED IN THIS MANUAL This manual covers the Lenze AC Tech SCF Series Variable Frequency Drive. 1.2 PRODUCT CHANGES Lenze AC Tech Corporation reserves the right to discontinue or make modifications to the design of its products without prior notice, and holds no obligation to make modifications to products sold previously. Lenze AC Tech Corporation also holds no liability for losses of any kind which may result from this action.
Do not touch any electronic components or contacts. This drive contains electrostatically sensitive components, which can easily be damaged by inappropriate handling. Static control precautions must be adhered to during installation, testing, servicing and repairing of this drive and associated options. Component damage may result if proper procedures are not followed. This drive has been tested by Underwriters Laboratory (UL) and is an approved component in compliance with UL508 Safety Standard.
2.0 SCF DIMENSIONS R H W T U V D P S Dia. Slot Mounting Tab Detail HP kW 0.25 0.18 0.5 1 1.5 2 4 0.37 0.75 1.1 1.5 INPUT VOLTAGE MODEL H W D If R < 6.30" (160) S = 0.19" (5) T = 0.38" (10) U = 0.18" (5) V = 0.66" (17) If R = 6.30" (160) S = 0.28" (7) T = 0.50" (13) U = 0.24" (6) V = 0.90" (23) P R 208 / 240 SF203Y 5.75 (146) 2.88 (73) 3.94 (100) 0.80 (20) 4.37 (111) 208 / 240 SF205Y 5.75 (146) 2.88 (73) 3.94 (100) 0.80 (20) 4.37 (111) 400 / 480 SF405 5.
HP 3 5 7.5 10 15 20 kW 2.2 3.7 5.5 7.5 11 15 25 18.5 30 22 SF01U INPUT VOLTAGE MODEL 208 / 240 SF230Y 5.75 (146) 3.76 (96) 6.74 (171) 3.40 (86) 3.25 (83) 208 / 240 SF230 5.75 (146) 2.88 (73) 5.74 (146) 2.60 (66) 3.06 (78) H W D P R 400 / 480 SF430 5.75 (146) 2.88 (73) 5.74 (146) 2.60 (66) 3.06 (78) 480 / 590 SF530 5.75 (146) 3.76 (96) 6.74 (171) 3.40 (86) 4.37 (111) 4.81 (122) 208 / 240 SF250Y 7.75 (197) 5.02 (128) 7.18 (182) 3.
2.1 SCF THROUGH-HOLE MOUNT DIMENSIONS D P H W HP 1 1.5 2 3 5 7.5 6 kW 0.75 1.1 1.5 2.2 3.7 5.5 INPUT VOLTAGE MODEL H W D P 208 / 240 SF210YF 7.72 (196) 6.80 (173) 4.55 (116) 1.20 (30) 208 / 240 SF210F 7.72 (196) 6.80 (173) 4.55 (116) 1.20 (30) 400 / 480 SF410F 7.72 (196) 6.80 (173) 4.55 (116) 1.20 (30) 480 / 590 SF510F 7.72 (196) 6.80 (173) 4.55 (116) 1.20 (30) 208 / 240 SF215YF 7.72 (196) 6.80 (173) 4.75 (121) 1.20 (30) 208 / 240 SF215F 7.
HP kW 10 7.5 15 11 20 15 25 18.5 INPUT VOLTAGE MODEL H W D P 208 / 240 SF2100F 15.59 (396) 11.14 (283) 7.65 (194) 3.60 (91) 400 / 480 SF4100F 11.59 (294) 11.14 (283) 7.65 (194) 3.60 (91) 480 / 590 SF5100F 11.59 (294) 11.14 (283) 7.65 (194) 3.60 (91) 208 / 240 SF2150F 18.09 (459) 11.14 (283) 8.29 (211) 3.60 (91) 400 / 480 SF4150F 15.59 (396) 11.14 (283) 8.29 (211) 3.60 (91) 480 / 590 SF5150F 15.59 (396) 11.14 (283) 8.29 (211) 3.
4.0 8 SCF SPECIFICATIONS Storage Temperature -20° to 70° C Ambient Operating Temperature 0° to 50° C (derate 2.
5.0 SCF RATINGS MODEL NUMBER (NOTE 1) FOR MOTORS RATED HP kW INPUT (50-60 Hz) INPUT PHASE SF200Y SERIES (NOTE 2) CURRENT (AMPS) OUTPUT POWER (kVA) 208 / 240 Vac CURRENT (AMPS) HEAT LOSS (WATTS) (NOTE 5) 0 - 200 / 230 Vac STD THRU SF203Y 0.25 0.20 1 3.6 / 3.2 0.76 1.6 / 1.4 19 N/A SF203Y 0.25 0.20 3 1.9 / 1.7 0.71 1.6 / 1.4 19 N/A SF205Y 0.5 0.37 1 5.4 / 4.7 1.2 2.5 / 2.2 26 N/A SF205Y 0.5 0.37 3 3.1 / 2.7 1.1 2.5 / 2.2 26 N/A SF210Y 1 0.75 1 10.6 / 9.
MODEL NUMBER (NOTE 1) FOR MOTORS RATED HP kW INPUT (50-60 Hz) INPUT PHASE SF400 SERIES (NOTE 3) CURRENT (AMPS) OUTPUT POWER (kVA) 400 / 480 Vac CURRENT (AMPS) HEAT LOSS (WATTS) (NOTE 5) 0 - 400 / 460 Vac STD THRU SF405 0.5 0.37 3 1.6 / 1.4 1.1 1.3 / 1.1 26 N/A SF410 1 0.75 3 2.9 / 2.5 2.1 2.4 / 2.1 40 12 SF415 1.5 1.1 3 4.0 / 3.6 3.0 3.4 / 3.0 56 13 SF420 2 1.5 3 4.6 / 4.0 3.3 3.9 / 3.4 67 14 SF430 3 2.2 3 6.2 / 5.4 4.5 5.5 / 4.8 100 19 SF450 5 3.
6.0 INSTALLATION NOTE SCF Series drives are intended for inclusion within other equipment, by professional electrical installers according to EN 61000-3-2. They are not intended for stand-alone operation WARNING! Drives must NOT be installed where subjected to adverse environmental conditions such as: combustible, oily, or hazardous vapors or dust; excessive moisture or dirt; vibration; excessive ambient temperatures.
6.2 EXPLOSION PROOF APPLICATIONS Explosion proof motors that are not rated for inverter use lose their certification when used for variable speed. Due to the many areas of liability that may be encountered when dealing with these applications, the following statement of policy applies: “Lenze AC Tech Corporation inverter products are sold with no warranty of fitness for a particular purpose or warranty of suitability for use with explosion proof motors.
7.1 INPUT VOLTAGE RATINGS SF200 Series drives are rated for 208/240 Vac, three phase, 50-60 Hz input. The drive will function with input voltages of 208 to 240 Vac (+ 10%, - 15%), at 48 to 62 Hz. SF200Y Series drives are rated for 208/240 Vac, single or three phase, 50-60 Hz input. The drive will function with input voltage of 208 to 240 Vac (+10%, -15%), at 48 to 62 Hz. SF400 Series drives are rated for 400/480 Vac three phase, 50-60 Hz input.
WARNING! This product can cause a DC current in the protective conductor. Where a residual current device (RCD) is used for protection in case of direct or indirect contact, only an RCD of Type B is allowed on the supply side of this product. Otherwise, another protective measure shall be applied, such as separation from the environment by double or reinforced insulation, or isolation from the supply system by a transformer. Observe the following when using RCDs: 1.
Filter: The input to the drive (or group of drives) must include a filter to reduce the electrical noise reflected back to the AC Line. The SCM can be installed to meet the industrial standards set by the EU, EN 61800-3 for conducted emissions and EN 55011 for radiated emissions to class A compliance when installed with an appropriately installed external line filter.
It is not recommended to install contactors or disconnect switches between the drive and motor. Operating such devices while the drive is running can potentially cause damage to the drive's power components. If such a device is required, it should only be operated when the drive is in a STOP state.
10.0 CONTROL WIRING 10.1 CONTROL WIRING VS. POWER WIRING External control wiring MUST be run in a separate conduit away from all other input and output power wiring. If control wiring is not kept separate from power wiring, electrical noise may be generated on the control wiring that will cause erratic drive behavior. Use twisted wires or shielded cable grounded at the drive chassis ONLY. Recommended control wire is Belden 8760 (2-wire) or 8770 (3-wire), or equivalent.
10.6 SPEED REFERENCE SELECTION If an analog speed reference input is used to control the drive speed, terminal TB-13A, 13B, or 13C (Parameter 10, 11, or 12) may be programmed as the input select for the desired analog input signal. When that TB-13 terminal is then closed to TB-2, the drive will follow the selected analog speed reference input.
NOTE If TB-13A, TB-13B, and TB-13C are all programmed to select speed references, and two or three of the terminals are closed to TB-2, the higher terminal has priority and will override the others. For example, if TB-13A is programmed to select 0-10VDC, and TB-13C is programmed to select PRESET SPEED #3, closing both terminals to TB-2 will cause the drive to respond to PRESET SPEED #3, because TB-13C overrides TB-13A. The exception to this is the MOP function, which requires the use of TB-13B and TB-13C.
11.0 SCF CONTROL WIRING DIAGRAMS 11.1 SCF TERMINAL STRIP Shown below is the terminal strip on the main control board, along with a brief description of the function of each terminal. The TB-2 terminals are internally connected to each other RS-485 SERIAL COMMUNICATIONS 30 31 TXA TXB 0-10 OR 2-10 VDC OUTPUT: LOAD CIRCUIT COMMON 2 0-10 OR 2-10 VDC OUTPUT: FREQ.
11.2 TWO-WIRE START/STOP CONTROL Shown below is the wiring diagram for a typical two-wire start/stop control scheme, using one maintained contact (such as that from a PLC) for RUN and STOP commands.
11.3 ALTERNATE TWO-WIRE START/STOP CONTROL Shown below is the wiring diagram for an alternate two-wire start/stop control scheme, using one maintained contact for RUN FORWARD and another maintained contact for RUN REVERSE.
11.4 THREE-WIRE START/STOP CONTROL Shown below is the wiring diagram for a typical three-wire start/stop control scheme, using momentary contacts (such as pushbuttons) for START and STOP commands.
11.5 SPEED POT AND PRESET SPEED CONTROL Shown below is the wiring for SPEED POT and/or PRESET SPEED control, and either a two-wire or three-wire start/stop circuit: The TB-2 terminals are internally connected to each other 2 30 31 TXA TXB COMMON PRESET SPEED SELECT PRESET SPEED SELECT 2.5k - 10kΩ PRESET SPEED SELECT START 10 VDC SUPPLY COMMON 0-10 VDC INPUT STOP 1 2 5 6 11 12 2 14 13A 13B 13C 15 25 NOTE • Program the PRESET SPEEDS (Parameters 31-37) to the desired values.
12.0 INITIAL POWER UP AND MOTOR ROTATION DANGER! Hazard of electrical shock! Wait three minutes after disconnecting incoming power before servicing drive. Capacitors retain charge after power is removed. STOP! • DO NOT connect incoming AC power to output terminals T1, T2, and T3 or terminals B+, B-! Severe damage to the drive will result. Do not continuously cycle input power to the drive more than once every two minutes. Damage to the drive will result.
3. Use the button to increase the speed setpoint until the motor starts to rotate. The left decimal point will light as the speed setpoint is increased. If the button is held down, the speed setpoint will increase by tenths of Hz until the next whole Hz is reached, and then it will increase by one Hz increments. Otherwise, each push of the button will increase the speed setpoint by a tenth of a Hz. 4.
Use the and buttons to scroll to the password value (the factory default password is “225”) and press the Mode button. Once the correct password value is entered, the display will read "P01", which indicates that the PROGRAM mode has been accessed at the beginning of the parameter menu (P01 is the first parameter).
Pressing the Mode will store the new setting and also exit the PROGRAM mode. To change another parameter, press the Mode key again to re-enter the PROGRAM mode (the parameter menu will be accessed at the parameter that was last viewed or changed before exiting). If the Mode key is pressed within two minutes of exiting the PROGRAM mode, the password is not required access the parameters. After two minutes, the password must be entered in order to access the parameters again. 13.
13.2 ELECTRONIC PROGRAMMING MODULE (EPM) Every SCF Series drive has an Electronic Programming Module (EPM) installed on the main control board. The EPM stores the user’s parameter settings and special OEM default settings (if programmed). The EPM is removable, allowing it to be installed in another drive for quick set-up. For example, if a drive is being replaced with a new one, the EPM can be taken out of the first drive and installed in the new drive.
14.0 PARAMETER MENU NOTE: If the drive is equipped with the PI option, please refer to Appendix B for additional parameter information. NO.
NO.
FACTORY DEFAULT NO. PARAMETER NAME RANGE OF ADJUSTMENT 31-37 PRESET SPEEDS 0.0 - MAXIMUM FREQUENCY 0.0 Hz 38 SKIP BANDWIDTH 0.0 - 10.0 Hz 0.0 Hz (NOTE 1) 39 SPEED SCALING 0.0 - 6500.0 0.0 40 FREQUENCY SCALING 3.0 - 2000.0 Hz 60.0 Hz 41 LOAD SCALING 10 - 200 % 200 % 42 ACCEL/DECEL #2 0.1 - 3600.0 SEC 20.
15.0 DESCRIPTION OF PARAMETERS P01 LINE VOLTAGE SELECTION This calibrates the drive for the actual applied input voltage, and can be set to HIGH (01) or LOW (02). Refer to the table below for the proper setting depending on the input voltage.
P03 START METHOD WARNING! Automatic starting of equipment may cause damage to equipment and/or injury to personnel! Automatic start should only be used on equipment that is inaccessible to personnel. 01 NORMAL: The drive will start when the appropriate contact is closed on the terminal strip, or by pressing the START key on the optional remote keypad. See Parameter 14. 02 START ON POWER UP: The drive will automatically start upon application of input power.
P04 STOP METHOD 01 COAST TO STOP: When a STOP command is given, the drive shuts off the output to the motor, allowing it to coast freely to a stop. 02 COAST WITH DC BRAKE: When a stop command is given, the drive will activate DC braking (after a delay of up to 2 seconds, depending on frequency) to help decelerate the load. Refer to Parameters: 21 - DC BRAKE TIME, and 22 - DC BRAKE VOLTAGE.
08 CURRENT LIMIT: Closes if the output current exceeds the CURRENT LIMIT setting. Opens if the output current is equal to or less than CURRENT LIMIT (see Parameter 25). 09 AUTOMATIC SPEED MODE: Closes if an AUTOMATIC (terminal strip) speed reference is active. Opens if a STANDARD (Parameter 5) speed reference is active. 10 REVERSE: Closes when reverse rotation is active. Opens when forward rotation is active. (see Parameter 17 - ROTATION DIRECTION).
P10 TB-13A FUNCTION SELECT This selects the function of terminal TB-13A. Closing TB-13A to TB-2 (or opening in the case of settings 7 and 10) activates the selected function. The following functions can be selected: 01 NONE: Disables the TB-13A function. 02 0-10 VDC: Selects a 0-10 VDC signal (at TB-5) as the AUTO speed reference input. 03 4-20 mA: Selects a 4-20 mA signal (at TB-25) as the AUTO speed reference input. 04 PRESET SPEED #1: Selects PRESET SPEED #1 as the AUTO speed reference.
P11 TB-13B FUNCTION SELECT This selects the function of terminal TB-13B. Closing TB-13B to TB-2 (or opening in the case of setting 08) activates the selected function. The following functions can be selected: 01 NONE: Disables the TB-13B function. 02 0-10 VDC: Selects a 0-10 VDC signal (at TB-5) as the AUTO speed reference input. 03 4-20 mA: Selects a 4-20 mA signal (at TB-25) as the AUTO speed reference input. 04 PRESET SPEED #2: Selects PRESET SPEED #2 as the AUTO speed reference.
P12 TB-13C FUNCTION SELECT This selects the function of terminal TB-13C. Closing TB-13C to TB-2 (or opening in the case of setting 06) activates the selected function. The following functions can be selected: 01 NONE: Disables the TB-13C function. 02 0-10 VDC: Selects a 0-10 VDC signal (at TB-5) as the AUTO speed reference input. 03 4-20 mA: Selects a 4-20 mA signal (at TB-25) as the AUTO speed reference input. 04 PRESET SPEED #3: Selects PRESET SPEED #3 as the AUTO speed reference.
P15 SERIAL LINK This parameter configures the drive for serial communications. The options are listed by baud rate, number of data bits, parity, number of stop bits, and whether the watchdog timer is enabled or disbabled. The watchdog timer will stop the drive after 10 seconds of no serial activity to safeguard against a failed serial link. During set-up or troubleshooting, it may be useful to disable the watchdog timer, but is it not recommended to run normally without the watchdog timer.
P20 DECELERATION TIME This parameter sets the deceleration rate for all of the speed reference sources (keypad, speed pot, 4-20 mA, 0-10 VDC, jog, MOP, and preset speeds). This setting is the time to decelerate from BASE FREQUENCY to 0 Hz. If the drive is set for COAST TO STOP (setting 01 or 02 in Parameter 04), this parameter will have no effect when a STOP command is given. P21 DC BRAKE TIME This determines the length of time that the DC braking voltage is applied to the motor.
P25 CURRENT LIMIT This sets the maximum allowable output current of the drive. The maximum setting is either 180% or 150%, depending on whether LINE VOLTAGE SELECTION (Parameter 01) is set to HIGH or LOW. The drive will enter current limit when the load demands more current than the CURRENT LIMIT setting. When this happens, the drive will reduce the output frequency in an attempt to reduce the output current.
HP DEFAULT HP DEFAULT 0.25 - 1 5.3% 10 2.4% 1.5 - 2 4.4% 15 2.2% 3 3.6% 20 2.0% 5 3.0% 25 1.8% 7.5 2.7% 30 1.6% Full Output Volts V/Hz Ratio Affected By Fixed Boost "Normal" Linear V/Hz Ratio 1/2 Base Frequency P29 Base Frequency ACCELERATION BOOST ACCELERATION BOOST helps accelerate high-inertia loads. During acceleration, the output voltage is increased to increase motor torque.
P38 SKIP BANDWIDTH The SCF drive has two skip frequencies that can be used to lock out critical frequencies that cause mechanical resonance in the system. Once SKIP BANDWIDTH is set to a value other than 0.0 Hz, the skip frequencies are enabled. When the skip frequency function is enabled, PRESET SPEED #6 and #7 are used as the skip frequencies. SKIP BANDWIDTH sets the range above the skip frequencies that the drive will not operate within.
P41 LOAD SCALING This scales the analog output signal at TB-30 and/or TB-31 when they are configured for a load output. This setting is the load (in %) that is indicated when the output signal measures 10 VDC. Example: A 0-10 VDC signal is required to indicate 0-150% load. Setting this parameter to 150% will yield 10 VDC at 150% load. P42 ACCEL / DECEL #2 This parameter sets the second acceleration and deceleration rate of the drive.
04 RESET 60: Resets the user parameters to the factory defaults for a 60 Hz base frequency. 05 RESET 50: Resets the user parameters to the factory defaults for a 50 Hz base frequency. Parameters 24, 27, and 40 will reset to 50.0 Hz. 06 TRANSLATE: If an EPM from a drive with a previous parameter version is installed in a new drive, the new drive will function like the previous version drive, but none of the parameter settings can be changed ("cE" will be displayed if this is attempted).
P54 MOTOR LOAD This displays the motor load in percent of the drive’s output current rating. P55 0-10 VDC ANALOG INPUT This displays the level of the 0-10 VDC analog input signal at TB-5. A reading of 100% indicates a 10 VDC input at TB-5. P56 4-20 mA ANALOG INPUT This displays the level of the 4-20 mA analog input signal at TB-25. A reading of 20% indicates a 4 mA input at TB-25, and a reading of 100% indicates a 20 mA input at TB-25.
16.0 TROUBLESHOOTING To aid in troubleshooting, Parameters 50 through 60 can be accessed without entering the PASSWORD. Simply press the Mode button twice to “skip” over the PASSWORD prompt, and “P50” will be displayed to indicate that the parameter menu has been entered and Parameter 50 (FAULT HISTORY) can be viewed. The and buttons can then be used to scroll from Parameter 50 to Parameter 60. Once the desired parameter is found, press the Mode button to view its “contents”.
The table below lists the fault conditions that will cause the drive to shut down, as well as some possible causes. Please contact the factory for more information on troubleshooting faults. FAULT MESSAGES FAULT DESCRIPTION & POSSIBLE CAUSES AF High Temperature Fault: Ambient temperature is too high; Cooling fan has failed (if equipped). CF Control Fault: A blank EPM, or an EPM with corrupted data has been installed. Perform a factory reset using Parameter 48 - PROGRAM SELECTION.
17.0 SCF DISPLAY MESSAGES The following describes the various displays and messages that can appear on the SCF drive. 17.1 SPEED DISPLAY If the drive is in a STOP state (indicated by "- - -" on the display), and the commanded speed is changed, the display will show the commanded speed, and the upper left decimal point will turn on solid. About five seconds after a change is made, the display will begin to alternate between the commanded speed value and the "- - -" display.
SPEED SOURCE DISPLAYS DISPLAY DESCRIPTION CP CONTROL PAD: Speed is set using the and buttons on the front of the drive EI EXTERNAL CURRENT: Speed source is a 4-20 mA signal wired to TB-25 and TB-2. EU EXTERNAL VOLTAGE: Speed source is a 0-10 VDC signal wired to TB-5 and TB-2. JG JOG: The drive is in Jog mode, and the speed is set by Preset Speed #2 (Parameter 32). OP MOP (Motor Operated Pot): Contacts wired to TB-13B and TB-13C are used to increase and decrease the drive speed.
APPENDIX A - THROUGH-HOLE MOUNT OPTION The Through-Hole Mount option for the SCF drive allows the drive to be mounted with the heatsink outside of the enclosure for better heat dissipation. This is done by using a special heatsink that mounts to the outside of the enclosure. The drive (which has a flat plate instead of a heatsink) is mounted to the heatsink from the inside of the enclosure. This requires cutting a hole in the enclosure that is slightly smaller than the heatsink.
THROUGH-HOLE MOUNT DIMENSIONS FOR MODELS UP TO 10 HP (7.5 kW) HP (kW) 1 (0.75) 1.5 (1.1) 2 (1.5) 3 (2.2) 5 (3.7) 7.5 (5.5) 10 (7.5) MODEL H W A B C E F J K SF210YF 7.72 6.80 2.76 2.76 6.00 2.69 N/A N/A N/A SF210F 7.72 6.80 2.76 2.76 6.00 2.69 N/A N/A N/A SF410F 7.72 6.80 2.76 2.76 6.00 2.69 N/A N/A N/A SF510F 7.72 6.80 2.76 2.76 6.00 2.69 N/A N/A N/A SF215YF 7.72 6.80 2.76 2.76 6.00 2.69 N/A N/A N/A SF215F 7.72 6.80 2.76 2.76 6.00 2.
THROUGH-HOLE DRAWING FOR 15 HP (11 kW) AND 20 HP (15 kW) MODELS This drawing applies to the following models only: SF2150F, SF4150F, SF5150F, SF4200F, and SF5200F. 1.04 (26) 2.24 (57) 2.24 (57) 1.04 (26) 0.24 (6) L M TOP F HEATSINK 0.63 (16) (left & right) E MOUNTING HOLES (#8) H PANEL CUTOUT E 1.00 (25) (top & bottom) F M 1.04 (26) 2.24 (57) 2.24 (57) 1.04 (26) 10.14 (258) 11.
THROUGH-HOLE MOUNT DRAWING FOR 25 HP (18.5 kW) MODELS This drawing applies to SF4250F and SF5250F models only. 2.50 (64) 3.00 (76) 2.50 (64) 1.34 (34) 0.50 (13) 1.00 (25) TOP 3.00 (76) HEATSINK 1.50 (38) 3.00 (76) MOUNTING HOLES (#10) 3.00 (76) 3.00 (76) 0.75 (19) 0.75 (19) 28.50 (724) 3.00 (76) 3.00 (76) 3.00 (76) 3.00 (76) PANEL CUTOUT 1.50 (38) 2.50 (64) 10.
APPENDIX B - PI SETPOINT CONTROL OPTION The following describes the PI Setpoint Control software option for the SCF drive. This software option has additional parameters compared to the standard SCF drive. Also, some of the parameters found in the standard drive have changed in the PI version. PI Setpoint Control allows the SCF drive to maintain a process setpoint, such as PSI or CFM, without using an external controller.
B.3 SETPOINT REFERENCES The following references can be used to adjust the process setpoint: 1. 2. 3. 4. 5. Keypad ( and buttons) 0-10 VDC signal (from speed pot or other source) 4-20 mA signal Preset Setpoints (using Preset Speeds #4 and #5) MOP (using terminals 13B and 13C) NOTE The setpoint reference and the PI feedback cannot be the same signal.
B.5 P10 12 P11 09 P12 10 P61 DESCRIPTION OF PI PARAMETERS TB-13A FUNCTION SELECT KEYPAD SETPOINT: This option has been added so that the and buttons on the front of the drive can be used as the PI setpoint reference source. Closing TB-13A to TB-2 will enable the PI mode and the and buttons can be used to select the desired process setpoint.
Example: A 0-100 psi transducer outputs 4 mA at 0 psi and 20 mA at 100 psi. Set MIN FEEDBACK to 0, and set MAX FEEDBACK to 100. The setpoint will then be adjustable between 0 and 100. NOTE If a reverse-acting feedback device is being used, MIN FEEDBACK should be set to the maximum process value, and MAX FEEDBACK should be set to the minimum process value. P64 PROPORTIONAL GAIN The Proportional Gain setting represents the speed command output (in % of maximum speed) that results from each 1% of error.
P74 ANALOG INPUT FILTER This adjusts the filter on the analog input terminals (TB-5 and TB-25) to reduce the effect of any electrical noise that may be present on the analog input signals. This filter works both in PI mode and standard speed control mode. It should be set to the lowest value that yields acceptable performance, as setting it too high may cause the drive to react too slowly to signal changes. The range of adjustment is 1 to 1000, which actually corresponds to 0.01 to 10.0 seconds.
B.6 DESCRIPTION OF OTHER PARAMETERS In addition to the PI feature, two parameters have been added, and additional options have been added to the open-collector status outputs: P06/P13 TB-14 / TB-15 OUTPUT Three more options have been added to the open-collector outputs: 11 MIN ALARM: Opens when the feedback signal falls below the MIN ALARM setting. 12 MAX ALARM: Opens when the feedback signal exceeds the MAX ALARM setting.
B.7 SCF SERIES PI CONTROL WIRING EXAMPLES The following diagrams illustrate the most common PI control configurations. The wiring and corresponding parameter settings are given. In these examples, TB-13A is used to select the setpoint reference (TB-13B or TB-13C could also be used for this function). The examples show a 2-wire start/stop circuit.
Example 2: Speed Pot Setpoint and 4-20 mA Feedback 1 2 5 6 11 12 2 14 13A 13B 13C 15 25 2 Speed Pot Start/Stop Contact Speed Pot Setpoint Select (PI Mode Enable/Disable) 4-20 mA Feedback - Set PI MODE (Parameter 61) to NORMAL 4-20 mA (02) or REVERSE 4-20 mA (04) depending on the system. Refer to section B.1 to determine whether the system is normal or reverse acting. - Set TB-13A FUNCTION SELECT (Parameter 10) to 0-10 VDC (02). - Close TB-13A to TB-2 to put the drive into PI mode.
B.8 TUNING THE PI CONTROL Once the PI control is configured properly, it needs to be tuned in order to maintain the process setpoint. First, set the Integral Gain (Parameter 65) to zero, and increase the Proportional Gain (Parameter 64) until the system becomes unstable, then lower the gain until the system stabilizes again. Set the Proportional Gain about 15% less than that value that stabilizes the system.
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