Electrical Troubleshooting; Confirming Tests For Led Status - Greenlee 555 Instruction Manual

Electrical Troubleshooting

The electrical control circuit of the 555 Bender consists
of the pendant switch unit, the control module circuit, the
power module circuit and the drive motor.
Drive motor will not operate
If the operating instructions for the 555 Bender are being
followed, but the drive motor does not operate when
either the bend or unload switches are held in the
DOWN position, the following procedure should be
utilized for locating the trouble in the electrical control
circuit.
A. Power Check
1. Check that the plug on the power cord is fully mated
with the female plug from the power source and that
all switches, fuses and disconnects in the power line
are on and operating.
2. Check to see that the bender circuit breaker is not
tripped. If tripped, reset by pushing the lever left,
then right.
If motor still does not operate, the next step is to isolate
the problem to the control section (pendant and control
module) or to the power section (power module and
motor) by the following procedure.
B. Control Section Analyses
1. Unplug the power cord from the power source.
2. Remove the cover of the control box and locate the
three small LED lights located near the center of the
control module.
LED Light
Red LED fails to light
Green LED fails to light
Amber LED fails to light
Greenlee Textron / Subsidiary of Textron Inc.
555 Electric Bender

Confirming Tests for LED Status

Probable Cause
No power to control
module
No power in bend
circuit of module
No power in unload
circuit of module
3. While observing the red center LED light, plug the
power cord into the power source connector. The
red light will momentarily light up if there is power in
the control module. (See chart below for confirming
test if red LED fails to light.) This red LED will also
momentarily light up when either the pendant bend
and unload switches are released from the down
position, indicating that the dynamic brake system
is functioning properly.
4. If there is power in the control module as tested
above, individually press the pendant switch in the
BEND and UNLOAD positions while observing the
amber and green LED lights. The green LED, when
lighted, indicates that the bend circuit of the control
module is operating and the amber LED, when
lighted, indicates that the unload circuit of the control
module is operating. (See chart below for confirming
test if the LEDs fail to light.)
Control Module - Front
503 5411.4
Amber LED
Confirming Test
Check for input power to control module across the
white wire of power cord and circuit breaker with
AC voltmeter. If there is power present, replace the
control module.
If not functioning, replace control module. If still not
functioning, go to Section C.
If not functioning, replace control module. If still not
functioning, go to Section C.
31 4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
Red LED
Green LED