Nabco GT-300 - User Manual

Questions and Answers

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allenrachaelAug 20, 2025
What to do if Nabco GT-300 safety sensor does not function?
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  Amber ValenciaAug 20, 2025
  If the safety sensor on your Nabco Gate Opener isn't working, there could be a few reasons. First, check the wiring on the harness and the power to the sensor to ensure it's receiving power. Next, ensure the sensor is properly connected to the Terminal Block, connecting the output of the sensor to the correct terminals (Terminals 5 (Red) and Terminal 4 (White) for header-mounted sensors, or Terminals 5 (Red) and Terminal 3 (Violet) for door-mounted sensors). Finally, verify that Dip Switch (2) Safety is set correctly: turn Dip Switch ON for sensors using N.O. Contacts, and turn Dip Switch OFF for sensors using N.C. Contacts.
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Robin JonesAug 22, 2025
Why Nabco Gate Opener door slams closed?
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  Carlos LopezAug 22, 2025
  If your Nabco Gate Opener door slams closed, here are some potential causes: For GT-710 models, the main speed on the Hydraulic Closer may need adjustment; turn the main speed adjustment on the Hydraulic Closer clockwise to decrease the closing speed. For GT-300/400/500 models, the closing speed on the Magnum control may need adjustment; turn it counterclockwise to decrease the closing speed. Another cause could be an open motor circuit, so check the connections on Pin (1) and Pin (2). Lastly, the Latch Check may be set too high; decrease the speed by turning counterclockwise for GT-300/400/500 models or clockwise for GT-710 models.
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Julie NguyenAug 25, 2025
What to do if Nabco Gate Opener door slams open?
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  Michelle KingAug 26, 2025
  If your Nabco Gate Opener door slams open, it might be due to the Back Check being set too high. For GT-300/400/500 models, decrease the speed by turning the BCHK Potentiometer on the Magnum 4A Control board counterclockwise. For GT-710 models, adjust the Back Check speed on the hydraulic closer clockwise to decrease the speed. Another cause could be a misplaced back check magnet on GT-710 models; reposition the magnet to its proper location. Also, the operator may not be correctly preloaded; pre-load the operator by correctly installing the arm on the operator spindle.
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Monique CombsAug 27, 2025
Why Nabco Gate Opener motor spins but the door doesn't open?
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  rmcclainAug 27, 2025
  If the motor spins when activated but the door doesn't open on your Nabco Gate Opener, the issue might be that, for GT-300/400/500 models, the motor is connected backwards; reverse the motor leads on the motor. Alternatively, the Motor/Operator coupling or spider coupling may be loose between the motor and operator. In this case, remove the motor and operator from the Header, separate the motor from the operator, and inspect the couplings for looseness.
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Michael RobinsonAug 30, 2025
Why Nabco Gate Opener header mounted swing side presence sensor is activated by opening or closing door?
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  Kirsten RichardsonAug 30, 2025
  The issue might be the connection of the Sensor to the Terminal Block was to “Continuous Safety” not “Safety w/Lockout”. Rewire Safety Sensor to “Safety w/Lockout” and connect the output of the Sensor to Terminal (5) Red Wire and Terminal (4) White Wire.
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john69Sep 1, 2025
Why Nabco GT-300 Gate Opener sensor shows activation signal was sent, but door does not open?
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  Maria HerreraSep 1, 2025
  If the sensor shows an activation signal was sent, but the door doesn't open, it could be due to the sensor not being properly connected to the activation circuit; check the wiring on the harness. Alternatively, a safety signal might be preventing the door from opening; correct the cause of the safety signal.
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April CurtisSep 4, 2025
How to fix Nabco GT-300 Gate Opener with no back check?
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  Rachel NavarroSep 4, 2025
  The absence of Back Check on your Nabco Gate Opener could stem from: the Back Check switch not closing at the correct position, so pre-load the operator by correctly installing the arm on the operator spindle; or, for GT-710 models, the magnets on the main sprocket not being in the correct position, so align the magnets.
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Michael WolfeSep 6, 2025
Why Nabco GT-300 back check adjustment on Magnum 4A has no effect?
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  Sonya DavidSep 6, 2025
  If the Back Check adjustment on your Magnum 4A control board has no effect, it could be because the door isn't going into Back Check at the 80° position. Pre-load the operator by correctly installing the arm on the operator spindle. Alternatively, for GT-710 models, the back check resistance on the Hydraulic closer might be set too high, preventing the motor from powering the door through back check to the open position; adjust the Back Check screw on the bottom of the header out one turn.
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Jamie JarvisSep 9, 2025
What to do if Nabco GT-300 door does not stay tightly closed?
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  Mary GarciaSep 9, 2025
  If your Nabco Gate Opener door isn't staying tightly closed, it could be due to incorrect preload; pre-load the operator by correctly installing the arm on the operator spindle. For GT-710 models, the closing spring tension on the Hydraulic Closer may be too light, so adjust the spring tension. Also, for GT-710 models, excessive building stack pressure could be the cause; consider upgrading the Operator Unit to GT-500 or install a power close module.
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John CarterSep 12, 2025
What happens if Fuse 1 (F1) opens in Nabco GT-300 Gate Opener?
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  Julia McbrideSep 12, 2025
  If Fuse 1 (F1) opens, it indicates a current consumption overload. Check the current consumption at Terminals 1 & 2. If the 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.