Rockwell Automation 20T PowerFlex Diode Bus Supply - Manual (Page 29)

Start Up/Troubleshooting 2-3
PowerFlex Diode Bus Supply User Manual
Publication 20T-UM001D-EN-P
Power On LED The green Power On LED is visible through the front panel and will
illuminated if power is applied.
Figure 2.1 Power On LED
Troubleshooting Table 2.A Possible Faults and Corrective Actions
!
ATTENTION: The Power On LED is only operational when the
unit is energized. Servicing energized equipment can be
hazardous. Severe injury or death can result from electrical shock,
burn, or unintended actuation of the controlled equipment. Follow
safety-related practices of NFPA 70E, Electrical Safety For
Employee Workplaces. DO NOT work alone on energized
equipment!
Power On LED
Fault Cause Corrective Action
Heat sink
Overtemperature Heat sink temperature
exceeds maximum
rating 1. Verify that maximum ambient temperature has not
been exceeded.
2. Check Overtemperature Switch (N.C. contacts) at
control terminals 10 and 11.
3. Check fan for correct operation.
4. Check for excess load on the Diode Bus Supply.
5. Check for minimum mounting clearance around the
Diode Bus Supply.
6. Contact your local Rockwell Automation sales office.
DC Output
Voltage Loss Loss of DC Bus power
and loss of 24V power 1. Check 3-phase AC incoming power for undervoltage
or phase loss.
2. Check Diode Bus Supply input circuit breaker or fuses.
3. Contact your local Rockwell Automation sales office.
Loss of 24V power
only (used for fan
power only) 1. Check fans for correct operation.
2. Check Overtemperature switches.
3. Contact your local Rockwell Automation sales office.