Troubleshooting
9-29
Rev. 9-09-16
Part #C-00084
Magnum 4A Control Wiring and Adjustment Manual
CHAPTER 9: Troubleshooting
Trouble
Possible Cause
Action
Operator does not function
Fuse 2 (F1) may be blown.
Replace Fuse.
Fuse installed on Brake Module
may be blown (except GT-710).
Test and Replace Fuse.
No incoming power.
Ensure 120 VAC incoming power is connected.
J5 Motor circuit may not be
properly connected.
X
GT-300/400/500:
1.►Go to J5 Motor Feed.
2.►Check connections to Pin (1) and Pin (2)
and also both Motor Leads connected to
brake module.
3.►
Replace motor if necessary.
X
GT-710:
1.►Go to J5 Motor Feed.
2.►Check connections to Pin (1) and Pin (2)
leading to Motor.
3.►
Replace motor if necessary.
Current consumption overload. 1.►Go to Terminal Block.
2.►Check current consumption at Terminals 1 & 2.
3.►If current draw exceeds 0.5 amps at 24 VAC,
disconnect auxiliary devices such as sensors
from Terminals 1 and 2 and install an alternate
power supply such as a Transformer.
Motor may be blown.
Replace motor.
Safety circuit is activated.
X
Check to ensure Dip Switch (2) is set correctly.
X
Ensure safety sensors are not activated.
GT-710: Activation Circuit may
not be properly connected.
To signal a Door Open command activation devices
must provide a Dry Switch closure across Terminals
5 and 6.
Door slams closed
GT-710: Main speed
on Hydraulic Closer
needs adjustment.
Turn main speed adjustment on Hydraulic Closer
clockwise to decrease closing speed.
GT-300/400/500: Closing
speed on Magnum control
needs adjustment.
1.►Go to CLOSE Potentiometer. Operation should
continue as soon as recycling is done.
2.►Turn counterclockwise to decrease closing
speed.
Motor circuit may be open.
1.►Go to J5 Motor Feed.
2.►Check connections on Pin (1) and Pin (2).
Latch Check may be set too high.
X
GT-300/400/500:
1.►Go to LCHK Potentiometer.
2.►Turn counterclockwise to decrease speed.
X
GT-710:
1.►Adjust latch check speed on hydraulic closer.
2.►Turn clockwise to decrease speed.
