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Rockwell Automation Publication 20P-TG004C-EN-P - September 2021
27
Component Test Procedures
Chapter 2
No Field Current
Note: For a flow chart version of these steps, see No Field Current on page
.
1.
Read the General Safety Precautions on page
.
2.
Remove the top control panel cover from the drive. See Protective Cover
Removal and Installation on page
3.
Verify that the correct AC voltage is present at terminals U1 and V1 at the
top of the field fuse holder mounted on the control panel. See
on
page
for a schematic diagram.
•
If the voltage is correct, continue with step 4 below.
•
If the voltage is incorrect or missing, remove power from the drive and
verify the wiring to the drive and the power supply source and correct
any problems. Test the voltage level again to verify that it is correct. If
the voltage is correct, but the fault persists or parameter 351 [Field
Current] is incorrect, continue with step 4 below.
4.
Remove AC power to the drive and check the fuses at FU1 and FV1.
•
If the fuses are blown, complete the steps in Test Field Wiring and
Voltage Signals on page
.
•
If the fuses are not blown, complete the steps in Test Field Control
Signals on page
.
Test Field Wiring and Voltage Signals
1.
Test the resistance of the motor field wiring and motor field for possible
short circuits.
•
If there are no short circuits, continue with step 2 below.
•
If a short circuit exists, correct any problems.
2.
Check the field SCR/dual diode module for a short circuit condition. See
Check the Field SCR/Dual Diode Module on page
•
If there are no short circuits, continue with step 3 below.
•
If a short circuit exists, replace the field SCR/dual diode module.
3.
Replace the field fuses at FU1 and FV1 and apply power to the drive.
4.
If the field fuses blow, replace the field board.
Test Field Control Signals
1.
Disconnect the cable from connector XR on the control board and
measure the U1-V1 voltage synchronization signal at pin 11 on the cable.
See
for location of the XR connector on the control
board.