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7.3 Troubleshooting
Have a good VOM meter with Min/ Max test button to check voltages and continuity. A Meg-Ohm meter capable of checking up
to 500 meg-ohms of resistance is necessary to properly check the integrity of the ground loops. When a malfunction occurs,
isolate the problem to one of three areas: 1) the operator, 2) the loop system, 3) the keying devices.
Use caution when check-
ing high voltage areas.
Symptom
Possible Solution(s)
•
Check that power to the operator is turned ON.
•
Check for AC power (115/230) at the power input terminals. If power is absent, check incoming
power to operator.
•
Be sure AC power switch is ON. Check for 24 VDC at P2, terminals 1 (+) and 2 (-). If no power,
faulty bridge rectifier or toroidal transformer. If power is present, possible faulty board.
Operator will not run.
Power LED is OFF.
•
Press “Push to Operate” button or momentarily jumper terminal 1 to terminal 2 (or 1 to 6). If the
input LED does not come ON, check the terminal strip or replace the circuit board. If LED does
come ON, proceed to next steps.
•
Check Motor:
Gate must be half way open before testing motor.
1.
Turn AC power OFF
and remove plug P2 from circuit board. On the P2 terminal, connect
terminal 1 to terminal 5 and terminal 2 to terminal 6. Turn AC power
ON – CAUTION – HIGH
VOLTAGE.
The motor should run, turn power
OFF
.
2.
With AC power still OFF
. Connect terminal 1 to terminal 6, and terminal 2 to terminal 5.
Turn AC power
ON – CAUTION – HIGH VOLTAGE.
The motor should run in the opposite direction
as terminal 1 to terminal 5 and terminal 2 to terminal 6, turn power
OFF
.
3.
If the motor does not run, or runs in only one direction, problem can be a bad motor, wire
connections from the control board to the motor or a bad control board. If the motor runs in
both steps above, contunue troubleshooting control board and accessories.
Operator will not run.
Power LED is ON.
1
. Check the input indicator LEDs. They should only come ON when a keying device (card reader, push button, etc.) is
activated. If any of the input LEDs are ON continuously, this will cause the gate operator to hold open. Disconnect the
keying devices one at a time until the LED goes OFF.
2
. Check any external entrapment protection devices. Any short or malfunction in these devices can cause the gate
operator to stop or to hold open.
3
. A malfunction in a loop or loop detector can cause the gate operator to hold open, or to not detect a vehicle when it is
present over the loop. The LEDs next to the loop detector ports on the operator circuit board will light only when the
loop has detected an object above it. If the LEDs stays on after the object has gone, then the loop detector has malfunc-
tioned. Pull the loop detector circuit boards from the loop ports on the operator circuit board. If the malfunction
persists, the problem is not with the loop system. For more information on trouble shooting loops and loop detectors,
refer to your loop detector instruction sheet and to the DoorKing Loop and Loop Detector Information Manual.
4
. Check to be sure that there are no shorted or open control wires from the keying devices to the gate operator. If a
keying device fails to open the gate, momentarily jumper across terminals 1 and 2 (or 1 and 6) on the gate operator
circuit board. If the gate operator starts, this indicates that a problem exist with the keying device and is not with the
gate operator.
5
. Check the high voltage supply. A voltage drop on the supply line (usually caused by using too small supply voltage
wires) will cause the operator to malfunction. Refer to the wire size chart in section 2.1 page 17.
