Rockwell Automation Allen-Bradley PowerFlex 4M, Hardware Service Manual

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32 Rockwell Automation Publication 20P-TG003B-EN-P - September 2021
Chapter 2 Component Test Procedures
Check the Pulse Transformer Board
The armature pulse transformer circuit board contains an isolated gate firing
circuit and also provides dv/dt protection for the armature SCR modules. A
malfunction of these devices will be indicated by either an Overcurrent fault
(F13), blown or tripped incoming protection devices or erratic motor operation.
Use the following procedure if a malfunction in this circuitry is suspected.
1. Read the General Safety Precautions on page 10 .
2. Remove power from the drive. See Remove Power from the Drive on
page 42 .
3. Remove the pulse transformer board (see Pulse Transformer Circuit Board
Removal and Installation on page 62 ).
4. With a digital multimeter set for a “continuity check”, measure each
connection point on the pulse transformer board listed in the tables below.
See
Figure 27 on page 132 for connector locations.
If any of the actual measurements are out of tolerance, replace the pulse
transformer board.
Table 6 - Armature Pulse/Snubber Circuit Measurements for Regenerative Drives
Table 7 - Armature Pulse/Snubber Circuit Measurements for Non-Regenerative Drives
For SCR Measure From
. . . To . . . Meter reading: Connector XY Pinout
1 KG1 XY-4
“open circuit”
4 KG4 XY-1
2 KG2 XY-5
5 KG5 XY-2
3 KG3 XY-6
6 KG6 XY-3
01 KG01 XY-1
04 KG04 XY-4
02 KG02 XY-2
05 KG05 XY-5
03 KG03 XY-3
06 KG06 XY-6
For SCR Measure From
. . . To . . . Meter reading: Connector XY Pinout
1 KG1 XY-1
“open circuit”
4
KG4 XY-4
2 KG2 XY-2
5
KG5 XY-5
3 KG3 XY-3
6
KG6 XY-6
10
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1
10
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1