Rockwell Automation Publication 20P-TG003B-EN-P - September 2021
23
Component Test Procedures
Chapter 2
A malfunctioning thyristor is connected to the relative gate. For example, if the
tested signal is at XR25 and the positive bridge is active (MP high) from the
following figure you can deduce that SCR connected to gate G6 is open.
Figure 5 - Open Thyristor Example
Troubleshoot a Field Current
Loss Fault
If the drive faults with a “Field Current Loss” fault (F6) and there is low or
incorrect field current present at the motor, as seen in parameter 351 [Field
Current], complete the steps in
Low or Incorrect Field Current
below. If the drive
faults with a “Field Current Loss” fault (F6) and there is no field current present
at the motor, as seen in parameter 351 [Field Current], complete the steps in
.
Low or Incorrect Field Current
Note: For a flow chart version of these steps, see
Low or Incorrect Field Current
.
1.
General Safety Precautions on page 10
.
2.
Verify the actual value of parameter 351 [Field Current] by measuring the
DC motor field current using a DC clamp.
3.
Verify that the drive rated field bridge current is set correctly in parameter
374 [Drv Fld Brdg Cur] and DIP switch S14 is configured to correctly
(according to the instructions in the PowerFlex Digital DC Drive User
Manual, publication
) and make any necessary corrections.
for DIP switch location.
5 V
0 V
XY19
Содержание Allen-Bradley PowerFlex 4M
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