Rockwell Automation DC3R Isolation Option Board - Manual (Page 19)

13 Calibration
Current input signal calibration
The following minimum and maximum values should be known:
Vomax - Maximum voltage output signal
Vomin - Minimum voltage input signal
Iimax
- Maximum current input signal
Iimin - Minimum current input signal
Iimin and Iimax is the current applied through terminals 8 and 9 (COM and INPUT
1). Vomin and Vomax is the voltage applied across terminals 1 and 2 (OUT1 and
OUT2).
Calibration procedure:
Use a voltmeter and ammeter for voltage and current measurements, respectively.
1. Switch only one of the SW501 DIP switches to the ON position (Figure 9, pg
12):
DIP switch 1 ON for 1–5 mA,
DIP switch 2 ON for 4–20 mA, or
DIP switch 3 ON for 10–50 mA.
2. Connect (but do not power) the current input signal as follows:
a. Connect the signal negative (–) to COM (terminal 7).
b. Connect the signal positive (+) to INPUT 1 (terminal 8).
3. Adjust the regenerative drive’s MIN SPD trimpot full CCW and the MAX SPD
trimpot full CW.
4. Apply both the AC line voltage and the current input signal.
5. Set the current input signal to Iimin.
6. Adjust the MIN OUT trimmer potentiometer (P503) so that the output voltage is
Vomin.
7. Set the current input signal to Iimax.
8. Calculate the test point voltage, Vtp:
ATTENTION: The control circuit is at line potential when the drive is
energized. Use a non-metallic screwdriver when making adjustments to the
circuit board potentiometers. Exercise extreme caution as hazardous voltage
exists. Failure to observe these precautions could result in severe bodily injury
of loss of life.
ATTENTION: The DC3 drive is intended to operate at a predetermined
minimum speed. If the application requires zero speed operation, the user is
responsible for assuring safe conditions for operating personnel by providing
suitable guards, audio or visual alarms, or other devices. Failure to observe
these precautions could result in bodily injury.
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