Troubleshooting 10-49 – Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE User Manual

Page 291

TROUBLESHOOTING

10-49

1557-UM050F-EN-P – June 2013

FAULT / ALARM

PROBABLE CAUSE

RECOMMENDED ACTION

ADAPTER LOSS
WARNING

1. LOSS OF COMMUNICATION

1A. CHECK THE CABLES BETWEEN

SCANport ADAPTER AND
COMMUNICATIONS PROCESSOR
BOARD

B. CHECK THE CONTROL VOLTAGE (+12V

DC)

C. CHECK THE HEALTHY LED ON COMM

PROC BOARD

D. CHECK WHETHER THE R/IO ADAPTER

IS CONNECTED ON PORT 2 OF THE
COMM PROC.

E. CHECK THE REMOTE I/O LINK TO PLC

BYPASS CLOSED
WARNING

1. BYPASS CONTACTOR CLOSED

WHEN IT SHOULD BE OPEN

2. CONTACTOR CONTROL POWER

NOT PRESENT OR
INTERMITTENT

3. OPEN CONTACT IN THE

CONTACTOR CONTROL WIRING

1A. CHECK THE I/O MODULES FOR

PROPER LEDs ON THE MODULE

B. CHECK THE PLC PROGRAM
C. CHECK THE FUNCTIONING OF THE

VACUUM CONTACTOR

2A. CHECK IF MEDIUM VOLTAGE FEED IS

CLOSED.

B. VERIFY THAT ISOLATION SWITCH

HANDLES ARE ENGAGED

C. CHECK THAT NORMAL-OFF-TEST

SELECTOR SWITCH IS IN THE
PROPER POSITION.

D. CHECK THE MEDIUM VOLTAGE

POWER AND LOW VOLTAGE
CONTROL FUSES.

E. CHECK THAT ISOLATION SWITCH AUX.

CONTACT ADJUSTMENTS.

F. CHECK FOR LOOSE WIRES OR

JUMPERS.

3A. RESET DRIVE EMERGENCY STOP.
B. CHECK IF EXTERNAL CUSTOMER

EMERGENCY STOP/PERMISSIVE
CONTACT IS OPEN.

BYPASS OPEN
WARNING

1. BYPASS CONTACTOR OPEN

WHEN IT SHOULD BE CLOSED