70 Rockwell Automation Publication 440R-UM013G-EN-P - December 2022
Chapter 11 Troubleshooting
Check the PowerFlex Drive Connections
Confirm that voltage is present at the safety relay terminals and the safety input terminals of
the PowerFlex drive. Figure 82 shows an example of the measurement points for one output
channel (terminal 34). Repeat the checking on the second channel (terminal 44). The terminal
connections from 34 and 44 to S1 and S2 can be reversed.
Figure 82 - Typical Connections to PowerFlex Drive
Figure 83 shows the test connections to verify the common reference between the DIS safety
relay and the AC Drive. Remove power from the application and set the digital multimeter to
ohms. If possible, measure directly at the terminals. The resistance must be less than 1 ohm.
Figure 83 - Continuity Test of the Voltage Supply Common Connection
Step Description
1
The voltage at 34 must be slightly less than the supply voltage. If not, then the DIS safety relay must be
replaced.
2
The voltage at S2 must be slightly less than the supply voltage and must be the same as the voltage at
terminal 34. If not, check for an open circuit (broken wire) between terminal 34 and S2.
3
The voltage at terminal 4 must be zero. If not, check for an open circuit between terminal 4 and the
voltage supply ground connection. Figure 83
shows how to verify the continuity from terminal 4 of the
drive to terminal A2 of the DIS safety relay.
SHOCK HAZARD: Turn the power off before continuity is tested.
34 44 14 24
S2
4
S1
A1
A2
23
Volts
DMM
1
2
3
OUT
24V common
24V DC supply
PowerFlex 525
AC Drive
Motor
34 44 14 24
S2
4
S1
A1
A2
OUT
< 1
Ohms
DMM
24V common
24V DC supply
PowerFlex 525
AC Drive
Motor
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