Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 294)

10-52 TROUBLESHOOTING
1557-UM050F-EN-P – June 2013
# FAULT / ALARM PROBABLE CAUSE RECOMMENDED ACTION
19 INPUT OPEN WARNING 1. INDICATION THAT THE INPUT
CONTACTOR IS OPENED WHEN
IT IS REQUESTED TO CLOSE
1A. CHECK THE OPERATION OF VACUUM
CONTACTOR. CHECK “HC” & “CC”
B. CHECK THE CONTROL CIRCUIT
C. CHECK THE DRIVE I/O BOARD FOR
MALFUNCTION
D. CHECK AUXILIARY CONTACTS OF
INPUT CONTACTOR
20 LINE A/C OVERVOLTAGE
FAULT
1. THE LINE VOLTAGE HAS
EXCEEDED THE SETTING IN
PARAMETER P-165 FOR THE
DURATION SET IN P-166
1A. CHECK THE INPUT VOLTAGE AT THE
C USTOMER‟S INCOMING AND GET
THE TAPS CHANGED ON THE
TRANSFORMER IF THE SYSTEM
VOLTAGE IS TOO HIGH
21 LINE DC OVERVOLTAGE
FAULT 1. THE LINE SIDE DC LINK
VOLTAGE IS EXCESSIVE
1A. CHECK THE SETTING FOR DC LINK
SIDE VOLTAGE ON PARAMETER P187
AND CHANGE THE VALUE IF REQUIRED,
IF THE OTHER PARAMETERS ARE SET
PROPERLY
B. CARRY OUT A FIRING PULSE CHECK
FOR THE LINE SIDE CONVERTER AND
MACHINE SIDE CONVERTER THE
CHECKS FOR FIRING PULSES FOR
SCR/GTO.
C. CHECK THE POWER SUPPLY BOARDS
D. CHECK TO ENSURE EACH LEG OF THE
MACHINE SIDE CONVERTER IS
CONDUCTING PROPERLY BY
MEASURING THE DC LINK VOLTAGE
22 LINE PARAMETER
FAULT 1. THE PARAMETERS STORED IN
EEPROM ON THE LINE
CONVERTER CONTROL BOARD
HAVE BEEN CORRUPTED
1A. CHECK AND CORRECT THE VALUES
OF ALL PARAMETER
B CHECK THE +5V POWER SUPPLY AT
DCB
C. CHECK THE RIBBON CABLE
CONNECTIONS
D. REPLACE THE LINE DCB IF FAULT
PERSISTS
23 LINE REVERSE
SEQUENCE WARNING 1. THE DRIVE ATTEMPTED TO
MAKE A SYNCHRONOUS
TRANSFER WITH REVERSE
SEQUENCE LINE VOLTAGE
1A. CHECK THE PHASING ON THE LINE
SIDE TO BYPASS AND CORRECT THE
SEQUENCE
B. CHECK THE SEQUENCE ON THE
OUTPUT SIDE OF LINE CONTACTOR
AND BYPASS CONTACTOR AND
CORRECT THE SEQUENCE
24 LINE SCR OPEN FAULT 1. AN OPEN SCR HAS BEEN
DETECTED IN THE LINE
CONVERTER
1A. CHECK THE SCR FOR OPEN CIRCUIT
B. CHECK THE SNUBBER CIRCUIT AND
DIAGNOSTIC RESISTOR
C. CHECK THE FIBER OPTIC CABLE
D. CHECK THE SCR GATE DRIVER
POWER SUPPLY BOARD
E. CHECK THE OPTICAL INTERFACE
BOARD
25 LINE SELF TEST FAULT 1. THE LINE CONVERTER BOARD
HAS FAILED ITS POWER UP
TEST
1A. CHECK THE DC POWER AT THE DRIVE
CONTROL BOARD FOR THE
PRESENCE OF +5V, +15V, -15V
B. CHECK WHETHER THE EPROM‟s ARE
PROPERLY SEATED IN THE SOCKETS
C. REPLACE THE DCB IF FAULT
PERSISTS