Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 295)

TROUBLESHOOTING 10-53
1557-UM050F-EN-P – June 2013
# FAULT / ALARM PROBABLE CAUSE RECOMMENDED ACTION
26 LINE SYNCH FAULT 1. THE CONVERTER GATING HAS
LOST SYNCHRONIZATION WITH
THE LINE VOLTAGE
1A. CHECK THE DRIVE GROUNDING FOR
PROPER CONNECTIONS
B. CHECK THE CONTROL SUPPLY FOR
ANY NOISE
C. CHECK THE SIGNAL GROUNDS FOR
PROPER CONNECTION
D. CHECK THE SETTING OF THE
COMMUTATION INDUCTANCE
PARAMETER
27 LINE UNDER VOLTAGE
WARNING 1. THE LINE VOLTAGE IS LOW
2. INPUT VOLTAGE SENSING
CORRUPTED
3. LINE DISTURBANCE
1A. VERIFY THE LINE UNDER VOLTAGE
SETTING IN THE PARAMETER TABLE
AND DETERMINE THE SETTING LEVEL
BASED ON THE EXISTING POWER
SYSTEM
B. CHECK AND RAISE THE TAP ON
POWER TRANSFORMER AFTER
CONSULTATION WITH THE CUSTOMER
2A. CHECK THE FUSING OF THE
TRANSIENT SUPPRESSION NETWORK.
B. CHECK THE VOLTAGE FEEDBACK
BOARDS FOR ANY OPEN RESISTORS
(LINE SIDE).
3A. RESET THE WARNING
28 MOTOR AC
OVERVOLTAGE 1. MACHINE SIDE CONVERTER
GATING CORRUPTED
1A. CHECK THE GATING SEQUENCE
B. CHECK THE FIBER OPTIC CABLES
C. CHECK THE FIBER OPTIC INTERFACE
BOARD
D. REPLACE THE FAULTY GATE DRIVER
BOARDS, ISOLATED GATE DRIVER
POWER SUPPLY BOARDS, AS
DETERMINED
E. SET THE EXCITATION LIMIT
PARAMETER TO A HIGHER VALUE
F. CHECK FOR LOW LINE VOLTAGE
29 MOTOR OVERLOAD 1. TRANSIENT LOADING
2. BURDEN RESISTOR OPEN 1A. ENSURE THAT THE ROTOR IS NOT
LOCKED, RESET AND RESTART
SET THE TORQUE LIMIT PARAMETER
TO A LOWER VALUE
2A. CHECK THE BURDEN RESISTORS
30 RATED RPM WARNING 1. RATED RPM SET TO AN
INVALID NUMBER
1A. CHECK THE VALUE OF THE RATED
RPM PARAMETER. THE VALUE MAY
HAVE BEEN SET TO SYNCHRONOUS
SPEED. ENTER THE FULL LOAD RPM
AND SAVE IN EEPROM.
31 PULSE NUMBER FAULT 1. PULSE NUMBER HAS CHANGED 1A. CHECK THE PULSE NUMBER
PARAMETER AND DEPENDING UPON
WHETHER THE DRIVE IS A 6 PULSE
OR 12 PULSE SET. THE PROPER
VALUE AND SAVE IN EEPROM AND
RECYCLE POWER.
32 SPEED COMMAND LOSS 1. DRIVE LOST COMMUNICATION
WITH THE DEVICE PROVIDING
THE SPEED COMMAND
1A. IF THE SPEED COMMAND IS
PROVIDED BY HIM, CHECK THE
ADAPTER CABLE BETWEEN COMM
PROC BOARD
B. IF THE SPEED COMMAND IS FROM
REMOTE SOURCE, CHECK THE
REASONS FOR LOSS OF
COMMUNICATIONS