Greenlee 855 - Wont Bend - Display Blank; Will Bend - Wont Count; Will Bend - Display Blank

Greenlee Textron / Subsidiary of Textron Inc.
59
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
855 Smart Bender™
The following flow charts will show some of the most likely areas
to look at for certain problems. They by no means encompass all
the possible problems or the only possible solutions.
Troubleshooting (cont’d)
WILL BEND – WON’T COUNT
NO
YES
Is bending shoe on in the proper
orientation?
Is 5 VDC measured across the center
and right legs of the voltage regulator
on the I/O board labeled VR2?
Does bender count with different
(good) pendant?
Do both Quad 1 and Quad 2
LEDs light when bend or unload
is pressed?
YES
YES
NO
YES
NO
YES
NO
When jog is pressed, does the
bender continue to run slowly
without stopping after 1/2 degree?
YES
Install shoe per
instructions in this
manual.
Replace optical
encoder.
Replace pendant
board.
Replace or adjust
limit switches or
wire unit.
NO
NO
Do Home 1 and Home 2 LEDs
light when the shoe is run past
the Start position?
YES
YES
NO
Is 12 VDC measured across
center and right legs of VR1 on
I/O board or does display light up
when brake is unplugged?
WILL BEND – DISPLAY BLANK
Is at least 80 volts measured at
the power cord?
NO
Find 120 VAC
power source.
Replace I/O
board.
Replace I/O
board.
Replace pendant board.
Replace optical
encoder.
Replace I/O board.
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Replace transformer unit.
Does bender work with
different (good) pendant?
Is fuse blown?
Is 115 VAC measured at
PGU board input?
Do any of the 8 LEDs on
the I/O board light?
Turn switch off and then
back on.
Bad pendant board, bad
pendant cord or plug inside
pendant is unplugged.
Bent pin connector in
receptacle or bad recep-
tacle unit?
Replace fuse.
Plugged into dead circuit,
bad power cord, or
switch is bad or off.
YES
Replace PGU.
Was pendant plugged in
after the bender was
turned on?
NO
Are metal oxide varistors
(MOVs) on PGU Board
damaged or discolored?
NO
YES
NO
Does PWM LED light
when BEND is pressed?
Disconnect I/O-PGU
cable on the I/O board
and reconnect to test
terminal. Disconnect
brake wire unit. Restore
power and push test
switch. Does shoe move?
(The toggle switch, lo-
cated next to the push
button switch, controls
the direction the shoe
moves.)
Replace PGU.
WON’T BEND – DISPLAY BLANK
Replace receptacle.
Replace PGU.
NO
YES
Replace I/O board.