Rockwell Automation 1771-P4R_P6R Allen-Bradley Redundent Power Installation Instructions - Manual (Page 13)

Allen-Bradley Redundant Power Supplies 13
Publication 1771-IN030B-EN-P - July 2002
Your power supply has two indicators located in the upper half of the
module front panel.
The top indicator is yellow and is labeled NON REDUNDANT
SYSTEM. This indicator tells you that the number of supplies in
operation is below the number required for redundant operation. The
yellow indicators in a redundant system operate together; they are
either all on or all off.
The lower indicator is green and is labeled P/S ACTIVE. The
following table shows how to interpret this indicator.
If P/S ACTIVE
indicator is
Then
ON This power supply is operating normally and a sufficient number of
power supplies is operational for the system configuration.
OFF The supply has detected one of the following conditions:
• dc overvoltage (the supply shuts down)
• dc undervoltage (the supply shuts down)
• dc overcurrent (the supply shuts down)
• power switch turned off (the supply is turned off)
• ac undervoltage
• insufficient number of operational power supplies for the system
configuration
When the P/S ACTIVE indicator is off because of an ac undervoltage
or because an insufficient number of supplies
is operational, the power supply may continue to deliver
output power.
When you troubleshoot your power supplies, you may be required to
remove and replace the power supply while power is still applied to
the chassis.
For information on See page
Removing the power supply 14
Inserting the power supply 14
Troubleshooting a single power supply 15
Troubleshooting multiple power supplies 16
Interpreting the Power
Supply Indicators
Troubleshoot Your Power
Supplies