Rockwell Automation Publication 750-UM006C-EN-P - March 2022
177
Troubleshooting
Chapter 6
Reset Drive via the Circuit Breaker Switch
The main 400/480V AC input rotary circuit breaker is provided power via the
M35 power receptacle (L123). The mechanical brake circuit breaker and the
control power circuit breaker are located under the auxiliary circuit breaker
door and are provided power by receptacles CP (24V DC auxiliary power) and
CPBR (24V DC brake options B2 and B3), or L123 (source brake option SB).
A visual inspection can verify that the breakers are individually open or closed.
Figure 11 - Circuit Breaker Definition Diagram
1. 400/480V AC rotary power for main circuit breaker (140G-G6C3-C30-AJ).
2. 24V DC mechanical brake circuit breaker (1489-M2D040) is shown on the enclosure.
The 400/480V AC source mechanical brake circuit breaker (140M-C2E-B25/140MT-C3E-B25) is shown on the left.
3. 24V DC control power circuit breaker (1489-M2D2040).
In addition to visual inspection, two of these breakers (24V DC control power
circuit breaker and the mechanical brake circuit breaker) have normally open
(N.O.) contacts. The N.O. contacts are wired in series to digital input 1 on the
digital I/O module mounted in slot 7.
When the 24V DC auxiliary control power is supplied to the unit (receptacle
CP), you can check the status of the breakers by monitoring
07:01 [Dig In
Sts] bit 1
, via the cover-mounted HIM or via EtherNet/IP. If it is equal to 1 all
breakers are closed/energized. If it is 0, then one or more of the three breakers is
open/tripped.
To help determine which of the three breakers are open (or tripped), check the
following in order:
1. Visually inspect the three breakers to verify if one of them is open.
• If yes, reset it and energize it.
• If no, something else is wrong.
