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Rockwell Automation Publication 8720MC-RM001K-EN-P - September 2018
Chapter 8
Troubleshoot the 8720MC-RPS Unit
Table 31 - Error Codes Relating to Leader Units
Error Code
Error Description
Error Cause
Corrective Action
P.U1
Small unit - Power
Module Phase L1 Error
Over current, overheat, or voltage drop of gate
power supply occurs in the L1 phase power
modules of the leader unit.
Check the wiring of the AC input power.
Check the ambient temperature, the cooling fan, and the clearances around the
unit.
If the error occurs intermittently, contact your Rockwell Automation sales
representative or replace the unit. Check that the harmonic filter is located on
the primary side of the line reactor and the secondary side of the line reactor is
connected to the unit.
Large unit - Power
Module Over Current
Overcurrent or short circuit occurs in power
modules of the leader unit.
Make sure that an overload or overcurrent failure or short circuit has not
occurred in the external equipment such as motors and inverters.
PU.1
Small unit - Power
Module Phase L2 Error
The phase L2 power module of the leader unit is
faulty.
Check the wiring of the AC input power.
Check the ambient temperature, the cooling fan, and the clearances around the
unit.
If the error occurs intermittently, contact your Rockwell Automation sales
representative or replace the unit. Check that the harmonic filter is located on
the primary side of the line reactor and the secondary side of the line reactor is
connected to the unit.
Large unit
Large unit is not used.
–
PU1.
Small unit - Power
Module Phase L3 Error
The phase L3 power module of the leader unit is
faulty.
Check the wiring of the AC input power.
Check the ambient temperature, the cooling fan, and the clearances around the
unit.
If the error occurs intermittently, contact your Rockwell Automation sales
representative or replace the unit. Check that the harmonic filter is located on
the primary side of the line reactor and the secondary side of the line reactor is
connected to the unit.
Large unit - Module
Overheating Error
Power modules of the leader unit has been
overheated.
Make sure that the unit is not running in an overload condition.
Check the ambient temperature, cooling fan, and available space around the
unit.
FA1
Fan Error
Small unit - Cooling fan of the leader unit failed.
Check the cooling fan and wiring of the cooling fan.
Large unit- The leader unit or cooling fan of the
line reactor failed. The line reactor is overheated.
Fuse for the control power supply (FU3) of the
leader unit is blown. Power supply board (APS)
failed.
Check the ambient temperature.
Check the fuse for the control power supply (FU3).
Check the voltage of TB4 (between 24V2 and 0V2).
LE1
Line Connect Error
The phases (L1, L2, and L3) of the AC input
power of the leader unit do not match with
those of the control power.
Make the phases (L1, L2, and L3) of the AC main power same as those of the
control power.
PS1
Power Supply Board Error
The Power Interface Board (PIFS) of the leader
unit is faulty.
If the error occurs intermittently, contact your Rockwell Automation sales
representative or replace the Power Interface Board (PIFS).