Tweco Merlin 6000 Slave PS - Manual (Page 30)

CUSTOMER/OPERATOR SERVICE 5-2 Manual 0-2570
Troubleshooting Specific Problems
A. Main disconnect fuse blows when primary power
is connected
1. Voltage selection busbars connected incorrectly
a. Check and correct if necessary.
2. One leg of three-phase primary connected to chassis
ground
a. Rewire input cable
3. Faulty power supply
a. Isolate and replace component(s) per Service
Manual.
B. AC Power Indicator on Front Panel not ON; Fan
OFF
1. Customer’s main power disconnect is turned OFF
a. Turn ON main power disconnect
2. Front Panel ON/OFF switch is turned OFF
a. Turn ON front panel power switch
3. No primary power
a. Check for proper three-phase power at input
terminal board
4. Blown fuse (F2)
a. Check and replace fuse if necessary
5. Faulty power supply
a. Isolate and replace component(s) per Service
Manual.
C. AC power indicator ON; Fan OFF
1. Remote Control or TB2 Enable switch not ON
a. Turn ON switch or enable signal at TB2 in Mas-
ter Power Supply
2. Primary power - missing phase
a. Check for proper three-phase power at input
terminal board
3. Blown fuse (F1 or F2)
a. Check and replace fuse if necessary
4. Power Supply Parallel Cable not installed
a. Connect cable between Master and Slave
Power Supplies
5. Faulty Slave Power Supply
a. Isolate and replace component(s) per Service
Manual
6. Faulty Master Power Supply
a. Isolate and replace component(s) per Service
Manual
D. TEMP indicator ON (red).
1. Unit overheated
a. Allow unit to cool. Check for adequate air flow
around unit
2. Faulty power supply
a. Isolate and replace component(s) per Service
Manual
E. DC indicator OFF (after pre-flow); No main
contactor closure
1. RUN/SET/PURGE switch not set to RUN on Master
Power Supply
a. Normal operation, set switch to RUN position
2. Faulty torch switch, remote control, or remote pendant
a. Isolate and replace component(s) per Service
Manual.
3. Parallel Cable not connected
a. Install Parallel Cable between Master and Slave
Power Supplies
4. Faulty power supply
a. Isolate and replace component(s) per Service
Manual.
F. System cuts at one-half expected current
1. Work lead not connected
a. Check work lead connections from Master and
Slave Power Supplies. Both work leads must
be connected.
2. Slave Power Supply not ON
a. Turn ON front panel ON/OFF power switch
3. Parallel Cable not connected
a. Install Parallel Cable between Master and Slave
Power Supplies
4. Faulty Slave Power Supply
a. Isolate and replace component(s) per Service
Manual
5. Faulty Master Power Supply
a. Isolate and replace component(s) per Service
Manual