Greenlee 555RSC Instruction Manual page 31

Troubleshooting (cont'd)
Won't bend
Is 115 VAC (90 VAC minimum)
measured at rectifier input?
YES
Is 28 VAC measured across the green
wires of the transformer?
YES
For 115 VAC input, is 165 (±5) VDC
measured at the rectifier output?
YES
Is there continuity across the red and
black wires of the pendant when BEND
is pressed?
YES
Does contactor K2 move?
YES
Is one arm of contactor stuck?
YES
Clean contacts or replace K2.
Bender runs only in the BEND direction
Is 90 VAC (minimum) measured at
rectifier input?
YES
Is there continuity across the red
and black wires of the pendant when
UNLOAD is pressed?
YES
Does contactor K1 move?
YES
Is one arm of contactor stuck?
YES
Clean contacts or replace K1.
Greenlee Tools, Inc.
• Verify circuit voltage.
NO
• Turn switch ON.
• Isolate and replace power cord or switch.
• Use a shorter or heavier gauge extension cord.
NO
Replace the transformer unit.
NO
Replace the rectifier.
NO Check the connections in the pendant.
Replace the switch if faulty.
NO
When BEND is pressed, is 24 VAC
(approx.) measured across the K2 coil?
YES
Replace contactor K2.
NO
Contact Greenlee for assistance.
• Connect bender to a receptacle with
the proper circuit voltage.
NO
• Use a shorter or heavier gauge
extension cord.
Check the connections in the pendant.
NO
Replace the switch if faulty.
NO
When UNLOAD is pressed, is 24 VAC
(approx.) measured across the K1 coil?
YES
Replace contactor K1.
Is there continuity across the normally
NO
open contacts of the auxiliary switch on
contractor K1?
YES
Contact Greenlee for assistance.
31
555C Electric Bender Classic
Is there continuity
across the normally
closed contacts of
NO
the auxiliary switch
on contactor K1?
Replace time delay
relay TD1.
NO
Replace time delay
relay TD2.
NO
Replace contactor
K1.
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Replace
contactor
NO
K1.
YES