Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 292)

10-50 TROUBLESHOOTING
1557-UM050F-EN-P – June 2013
# FAULT / ALARM PROBABLE CAUSE RECOMMENDED ACTION
12 COMM PROC BOARD
WARNING 1. FAILURE OF COMMUNICATION 1A. CHECK THE HEALTHY LED ON DCB
B. CHECK THE HEALTHY LED ON COMM
PROC BOARD
C. CHECK THE RIBBON CABLES
D. REPLACE THE COMM PROC BOARD
13 DC CONTROL POWER
FAULT
1. NO OUTPUT FROM AC/DC
POWER SUPPLY
2. LOW DC OUTPUT VOLTAGE
1A. CHECK THE OUTPUT FROM AC/DC
POWER SUPPLY, IT SHOULD BE AT
LEAST 50V WHEN THE LOAD IS
CONNECTED
B. DISCONNECT THE OUTPUT LOAD AND
VERIFY THE DC VOLTAGE AT POWER
SUPPLY
C. IF LOAD IS FAULTY, ISOLATE THE LOAD
D. CHECK THE CONTROL WIRING
2A. CHECK THE DC OUTPUT VOLTAGE
(98% OF 48V). IF THE VALUE IS LOW,
A DC CONTROL POWER FAULT IS
SIGNALED. ADJUST THE OUTPUT TO
50.8V. (CALIBRATE INDIVIDUAL
MODULES.)
B. CHECK THE ANNUNCIATOR CIRCUIT
IN THE POWER SUPPLY
C. REPLACE THE ANNUNCIATOR BOARD
D. CHECK THE LOADING ON THE POWER
SUPPLY
14 DRIVE OVERLOAD
WARNING / FAULT
1. THE DRIVE OVERLOAD
PROTECTION HAS REACHED
THE SET VALUE
1A. CHECK THE LOAD FOR ABNORMAL
CONDITIONS AND CORRECT.
B. THE LOAD MAY BE SLIPPING
EXCESSIVELY. TAKE CORRECTIVE
ACTION.
C. THE TORQUE LIMIT MOTORING IS SET
FAR TOO HIGH. VERIFY THE
PARAMETER AND SET THE VALUE TO
A PROPER VALUE.
D. CHECK THE BURDEN RESISTORS
15 FIRMWARE REVISION
FAULT 1. FIRMWARE IN THE DCB OR THE
COMM PROC BOARD NOT
COMPATIBLE
1A. CHECK THE FIRMWARE REVISION
LEVELS IN THE TWO DRIVE CONTROL
BOARDS WITH THAT OF
COMMUNICATION PROCESSOR
BOARD AS PER THE COMPATIBILITY
CHART AND INSTALL CORRECT
VERSIONS
16 GROUND FAULT 1. THE SIGNAL FROM THE
GROUND FAULT CT EXCEEDED
THE VALUE SET IN THE
PARAMETER P171 FOR
DURATION SET IN THE
PARAMETER P172
2. BURDEN RESISTOR OPENED
1A. CHECK THE LOAD FOR ANY GROUND
FAULT.
B. MEGGER THE DRIVE, AS PER THE
PROCEDURE AND LOCATE THE
GROUND FAULT.
C. CHECK THE CABLES FROM/TO LINE
REACTOR/ISOLATION TRANSFORMER
FOR ANY GROUND FAULT AND
RECTIFY
2A. CHECK THE BURDEN RESISTOR AND
REPLACE IF DEFECTIVE