20 Rockwell Automation Publication 20P-TG002B-EN-P - February 2018
Chapter 2 Component Test Procedures
• If any of the voltage measurements above are incorrect or missing,
continue with step 5.
• If the voltage measurements above are correct but the value of
parameter 466 [AC Line Voltage] is incorrect, replace the control
board.
5. Remove the ribbon cable connected to XR on the control board and
pulse transformer board and test the continuity of the cable using the
measurements in Ta b l e 24
on page 116.
If the measurements on the XR cable are correct, replace the pulse transformer
board.
Troubleshoot an Armature
Bridge Failure
If the drive is running unstable or faults with an Overcurrent Fault (F13) an
armature bridge failure may have occurred. All of the signals going to and
coming from the SCR bridges are transmitted via the ribbon cable connected
to XR on the control board and can be measured at these points. See Figure 27
on page 119
for location of the XR connector on the control board.
Note: If using an AC input contactor, this step requires that the cable remain
connected to the XR connector on the control board and that an adapter be
used to measure these signals.
1. Read the General Safety Precautions on page 10
.
2. Remove the protective covers (see page 43
).
3. If using a DC output contactor, disconnect the cable from XR on the
control board and measure the signal for each SCR gate as indicated in
this table:
Figure 3
and Figure 4 on page 21, and Figure 5 on page 22 are examples
representing gate pulse, current and voltage signal measurements taken
on an SCR. In the figures below:
– The current signal is taken on the testpoint XY17 (+2.5V offset;
+0.6V=Drive size current).
– The voltage signal is taken on the testpoint XY19 (+2.5V offset).
– The ground signal is taken on either testpoint XY10 or XY18.
Signal Name XR Cable Pin Gate Note
MP MN
IT1 27 G1 G04
IT2 29 G2 G05
IT3 31 G3 G06
IT4 21 G4 G01
IT5 23 G5 G02
IT6 25 G6 G03
MN 33 – – Negative bridge MN - active when high (+5V)
MP 34 – – Positive bridge MP - active when high (+5V)
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