Rockwell Automation Allen-Bradley PowerFlex 20P, Manual

Page: 22 / 142

22
Rockwell Automation Publication 20P-TG004C-EN-P - September 2021
Chapter 2
Component Test Procedures
Troubleshoot an AC
Undervoltage Fault If the drive faults with an AC Undervoltage Fault (F4), or parameter 466 [AC
Line Voltage] does not equal the expected incoming AC line voltage, measure the
AC line input signals as directed in the steps below.
1.
Read the General Safety Precautions on page 10 .
2.
Remove the bottom control panel and I/O and control terminal covers
from the drive. See Protective Cover Removal and Installation on page
47 .
3.
Using a voltmeter, measure the voltage at terminals U, V, and W of the
drive.
Note: If an AC input contactor is used, the voltage must be measured on
both the input and output sides of the contactor.
If any of the voltage measurements is incorrect or missing, remove
incoming AC power and verify the wiring to the drive and the power
supply source and correct any problems.
4.
Using a voltmeter, measure the combined voltages of the AC lines on the
following testpoints on the control board (all waveforms have a 2.5V
offset). See
Figure 2 on page 20 and Figure 3 on page 21 for location of the
testpoints. Also, see Figure 16 on page 117 for a schematic diagram.
Table 1 - Combined AC Line Input Signal Testpoints
Incoming AC
Line Voltage Phases Measure From
Testpoint … To Testpoint Peak to Peak
Measurement RMS Measurement
240 VAC
V and U XY22 … XY18
1.42 VAC 0.500 V
V and W XY21 … XY18
480 VAC
V and U XY22 … XY18
2.95 VAC 1.040 V
V and W XY21 … XY18
575 VAC
V and U XY22 … XY18
2.85 VAC 1.007 V
V and W XY21 … XY18
690 VAC
V and U XY22 … XY18
3.45 VAC 1.220 V
V and W XY21 … XY18