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Magnum 4A Control Wiring & Adjustment Manual
Part #15-10682
Door slams open.
Trouble
Fuse 1 (F1) or Fuse 2
(F2) blows when OPEN
Potentiometer is activated.
Motor spins when
activated but door does
not open.
Back Check adjustment on
Magnum 4A has no effect.
No Back Check.
Door does not stay
tightly closed.
9-32
Back Check may be set too high.
Possible Cause
GT-710: Back check magnet not
in place.
Operator may not be correctly
preloaded.
Current consumption overload.
GT-300/400/500: motor
connected backwards.
Motor/Operator coupling or
spider coupling loose between
motor and operator.
Door is not going into Back
Check at 80 ° position.
GT-710: Back check resistance
on Hydraulic closer set too
high and motor cannot power
door through back check to
open position.
Back Check switch may not be
closing at correct position.
GT-710: Magnets on main
sprocket not in correct position.
Preload may not be correct.
GT-710: Closing spring tension
on Hydraulic Closer may be
too light.
GT-710: Building stack pressure
is excessive.
X GT-300/400/500:
Action
1.►Go to BCHK Potentiometer on Magnum 4A
Control board.
2.►Turn counterclockwise to decrease speed.
X GT-710:
1.►Adjust Back Check speed on hydraulic closer.
2.►Turn clockwise to decrease speed.
Reposition magnet back to its proper location.
Pre-load operator by correctly installing arm on
operator spindle per hardware installation manuals.
1.►Go to Terminal Block.
2.►Check current consumption at Terminals 1 & 2.
3.►If power 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.
Reverse motor leads on motor.
1.►Remove motor and operator from Header.
2.►Separate motor from operator.
3.►Inspect couplings for looseness.
X Pre-load operator by correctly installing
arm on operator spindle per Hardware Installation
manuals.
X GT-710: Reposition Back Check magnet.
Adjust the Back Check screw on the bottom of the
header out one turn.
Pre-load operator by correctly installing arm on
operator spindle per Hardware Installation manuals.
Align magnets per Hardware Installation manual.
Pre-load operator by correctly installing arm on
operator spindle per hardware installation manuals.
Adjust spring tension on Hydraulic Closer.
Upgrade Operator Unit to GT-500 or install power
close module.
X GT-300/400/500: Kit Part Number: 11-13140.
X GT-710 Swinger: Kit Part Number: 11-13141.
Note: Please refer to section C-1 in Price Binder for
more information.
www.NabcoEntrances.com
Rev. 7-03-14
Troubleshooting
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