96 Rockwell Automation Publication 750-IN119A-EN-P - April 2022
Chapter 6 Service and Maintenance
Remove Power from the
System
The following procedures must be followed before attempting to service any
part of a PowerFlex 755TS drive.
1. Turn off and lock out all input power, including any external power
sources.
2. Wait 15 minutes.
3. If a conduit box is present, remove the M6 x 12 mm torx screw that
secures the conduit box cover to the chassis and remove the cover.
4. Remove the cover. See Chapter 4
.
If the conduit box is present, loosen the four M6 captive torx screws that
secure the cover to the conduit box and remove the cover.
5. Measure the AC input voltage to verify that there is no voltage present
(See Three-phase Power Terminal Locations on page 65
):
• Measure the AC input terminals R/L1, S/L2, and T/L3, L to L and L to
chassis GND (PE).
Multimeter
Digital multimeter, capable of AC and DC voltage, continuity, resistance,
capacitance measurements, and forward diode bias tests. Fluke model 87 III
or equivalent.
Nose pliers —
Oscilloscope Portable, digitizing, dual channel scope, with isolation
Phillips screwdriver/bit #1, #2, 492-C
Pozidriv #2, M3 x 7
Torque wrench 1...12 N
•m (8.8…106 lb•in)
Torque wrench 6...50 N•m (53…443 lb•in)
Wire cutter —
Table 29 - Installation and Service Tools (continued)
Tool Description Details
WARNING: Remove power before you remove or make cable connections.
When you remove or insert a cable connector with power applied, an
electric arc can occur. An electric arc can cause personal injury or property
damage in theses ways:
• An electric arc can send an erroneous signal to system field devices,
which can cause unintended machine motion
• An electric arc can cause an explosion in a hazardous environment
Electric arcs cause excessive wear to contacts on both the module and
its mating connector. Worn contacts can create electrical resistance.
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