Delta SG1420 - Troubleshooting

Copyright 2001 Delta Scientific Corporation Page 7 of 18
All Rights Reserved Document: A2026.3 SG1420 Instructions
Troubleshooting
If Gate fails to move:
1) Check Gate ‘Power’ switch. Switch must be in the ‘On’ position.
2) Check thermal overload on motor. If overload is tripped, reset by pushing trip button. If
motor is hot, let it cool before trying to reset.
CAUTION: Power switch should be in the ‘Off’ position when resetting the
thermal trip to prevent hands from being caught in the drive belt pulleys if
motor should happen to start on reset.
3) Check circuit breaker/disconnect switch feeding the Gate. Reset as necessary.
4) If there is power to the Gate (120/1/60 at terminal 1 and terminal 2):
a) Try switching the ‘Auto-Manual’ switch to ‘Manual’. The gate arm should go up. If
not, turn Power switch ‘Off’ and disconnect Gate at the Main. Check all electrical
connections (terminals and screws) for tightness. If Gate still will not function
when power is restored, call factory for assistance.
i) If Gate functions on ‘Manual’ but does not respond to vend or reset
signals; check control devices and detectors. When possible, exchange
known good components for suspected ones.
ii) If control devices and detectors are proved OK, the field wiring or
harnesses are to be suspected. Call factory for help.
b) If Gate runs but cycles up and down without stopping:
i) Check limit switch adjustment per the above instructions.
ii) If the limit switches are in their proper location, at least one switch is likely
failed. If the Gate runs on with the Auto-Manual switch in the ‘Manual’
position the UP limit switch has failed. If the Gate runs on in the ‘Auto’
position the DOWN limit switch is failed.
If gate moves erratically:
Erratic gate motion requires the drive belt tension to be checked. Open the SG1420’S’s door
and inspect the drive belt for looseness or excessive wear. If the belt appears worn or frayed, or
if the belt appears loose, first: remove Electrical Power to the gate and second, tighten or
replace the belt with a new one. To remove or tighten the belt, first loosen the Electrical Motor
mounting nuts slightly and pull the motor away from the Gear Reducer, then tighten the
Electrical, motor mounting nuts, thus tightening the drive belt.