Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 297)

TROUBLESHOOTING 10-55
1557-UM050F-EN-P – June 2013
# FAULT / ALARM PROBABLE CAUSE RECOMMENDED ACTION
35 MOTOR DOES NOT
ROTATE
1. IMPROPER MODE SELECTED
2. MOTOR FAILURE
3. MV SENSING NOT AVAILABLE
TO THE DRIVE CONTROLS
4. FAILURE OF TACHOMETER
5.
THE STOP SIGNAL IS AT LOW
LEVEL FROM C
USTOMER‟S
PLC
6.
FAILURE OF MOTOR
CAPACITOR
1A. CHECK THE MODE OF OPERATION
FROM THE PARAMETER TEST MODE
AND SET IT TO ZERO, WHICH IS THE
NORMAL MODE OF OPERATION
2A. MEGGER THE MOTOR AND
DETERMINE THE CONDITION
3A. CHECK THE VARIABLE V
LINE
AND IT
SHOULD READ AROUND 1.0 PU.
DETERMINE THE CAUSES AND
RECTIFY.
4A. THE PANEL VIEW MAY INDICATE THAT
THE DRIVE IS RUNNING WHEN THE
MOTOR IS NOT ROTATING, CHECK
THE FUNCTIONING OF THE
TACHOMETER
5A. CHECK THE STATUS VARIABLE LOGIC
COMMAND WORD OR STOP OWNER
VARIABLE AND RECTIFY.
6A. CHECK THE MOTOR FILTER
CAPACITORS FOR ANY SHORTING
36 OVER TEMPERATURE 1
THROUGH 7.
1. OPEN THERMISTOR
2. OPEN FEED BACK CIRCUIT
3. FAN FAILURE
4. FAILED RECEIVER CIRCUIT
1A. CHECK THE THERMISTOR ON THE
MACHINE SIDE CONVERTER STACK
2A. CHECK THE POWER TO THE
THERMISTOR FEED BACK BOARD
CHECK THE FIBER OPTIC CABLE
FROM THE THERMISTOR FEED BACK
BOARD TO THE OPTICAL INTERFACE
BOARD
3A. CHECK FOR THE CORRECT FAN
OPERATION
B. CHECK FOR PROPER VENTILATION
4A. CHECK THE RECEIVER CIRCUIT ON
THE OPTICAL INTERFACE BOARD AND
REPLACE THE BOARD IF NECESSARY
37 NO READY LIGHT
1. NO MEDIUM VOLTAGE
2. BLOWN FUSE ON SURGE
SUPPRESSION NETWORK
3. LOW LINE VOLTAGE.
1A. CLOSE THE INPUT ISOLATOR
B. CHECK THE POWER SUPPLY FROM
CUSTOMER SIDE
C. INPUT CONTACTOR CONFIGURED AS
NORMALLY OPEN
2A. CHECK THE FUSES ON THE SURGE
SUPPRESSION NETWORK
B. CHECK THE MOV‟S INTEGRITY AND
REPLACE THE DEFECTIVE MOV
C. CHECK THE V
LINE
VARIABLE, IT
SHOULD READ 1.0 P.U.
D. SCOPE THE WAVEFORM AT V
12
, V
23
,
V
31
ON LINE SIDE DRIVE CONTROL
BOARD FOR PROPER SHAPE
3.
VERIFY V line AND ENSURE PROPER
VOLTAGE TO DRIVE.