22 Rockwell Automation Publication 750-UM002H-EN-P - February 2017
Chapter 2 Installation and Wiring
For PowerFlex 755 and PowerFlex 753 Drives (Frames 8…10), measure the DC
bus voltage at the DC+ and DC- TESTPOINT sockets on the front of the
power module.
Verify Zero Voltage on PowerFlex 755T Drive Products
1. For low-harmonic/regenerative drives and common bus supplies,
complete steps a…d.
a. On the power input bay, turn the disconnect switch to the Off
position.
b. Wait 15 minutes and open the enclosure door.
c. Close and lock the hasp on the circuit breaker.
d. Lock the fused disconnect switch.
2. For common-bus inverters, complete steps a…e.
a. Turn the disconnect switch to the “Off ” position.
b. Wait 15 minutes and open the enclosure door.
c. Close and lock the hasp on the molded case switch.
d. Lock the fused disconnect switch.
e. If a control bay is used, turn the selector switch to the Off position
and lock the switch.
3. For low-harmonic/regenerative drives and common-bus supplies,
measure the AC input and DC-bus voltage at the following testpoint
sockets in the power bay:
• Measure L to L and L to chassis GND using the circuit breaker
output (CB1) testpoints R/L1, S/L2, and T/L3.
• Measure L to L and L to chassis GND using the fused disconnect
output (FD1) testpoints R, S, and T.
• Measure +DC to -DC, +DC to chassis GND, and -DC to chassis
GND using the DC bus testpoints +DC and -DC.
The voltage at all test points must be 0 volts.
ATTENTION: To avoid an electric shock hazard, verify that there is no AC
input and DC bus voltage before servicing by taking these measurements:
• Verify that there is no AC input voltage present using the R/L1, S/L2, and
T/L3 testpoint sockets in the input bay by measuring L to L and L to GND.
• Verify that there is no AC input voltage present using the R, S, and T
testpoint sockets in the input bay by measuring L to L and L to GND.
• Verify that there is no DC bus voltage present using the +DC to -DC
testpoints in the input bay by measuring +DC to -DC, +DC to GND, and -DC
to GND.
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