Recovering from fatal error, Warning buzzer – Rockwell Automation 8720MC 8720MC Regenerative Power Supply User Manual User Manual

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Fatal error codes normally indicate a malfunction of the Regulator
Board. In some cases, fatal error codes can be reset by once
disconnecting the power supply and reapplying power. But in order
to prevent any problem, the Regulator Board must be replaced.

The table below lists the fatal error codes.

Error
Code

SCx

CHS

CPU

SYS

Error
Description

Self Check Error

Checksum Error

CPU Error

System Error

Error Cause

Error was detected during
self-diagnostics. "x" in the error code
shows an integer value of 1 to 7.

Writing parameter value to EEPROM
was not successful.

Unexpected error occurred during
CPU internal calculation.

Unexpected error occurred.

Corrective Action

Contact the Allen-Bradley Company or replace the Regulator
Board.

Set again the Unit Selection (F.001), and restore all the
parameters to the default values.

If this error occurs intermittently, contact the Allen-Bradley
Company or replace the Regulator Board.

Contact the Allen-Bradley Company or replace the Regulator
Board.

Step 3.

Press the ENT key.

If there is no error that occurred,
"0---" will be displayed.

If there is any error that occurred,
the last error that occurred will be
displayed.

Step 4. When the RST key is pressed while the error log is being

displayed, all the entries of the error log will be cleared,
and "Err" will be displayed again, indicating that the error
log became empty.

8-6

Error Codes and Warning Buzzer

Recovering from Fatal Error

RST PRG ENT

READY

FAULT

PROGRAM

RST PRG ENT

READY

FAULT

PROGRAM

RST PRG ENT

READY

FAULT

PROGRAM

Warning Buzzer

Model 8720MC-RPS190BM and 8720MC-RPS190BS units are
provided with thermo switch so that warning buzzer will alert
operators when intake air temperature to the 8720MC-RPS
Regenerative Power Supply exceeds about 50 degree C (122 degree
F). In such a case, check the ambient temperature and the cooling
fans.