Troubleshooting
33
First Open/Close After Cycling Power
After power is cycled, and doors are in full close position with DCL active, an OPEN command
should be given using local command on programmer board. Doors will move in open direction
at REDUCED SPEED. If a CLOSE command is given before DOL is generated, doors will move
in close direction at REDUCED SPEED.
DOORS WILL MOVE AT REDUCED SPEED UNTIL FIRST DOL IS GENERATED.
This is necessary after having cycled power because the drive needs to determine a fixed refer-
ence point for door position. (While the drive was turned off, the doors could have moved.) BE
SURE CONTROLLER DOOR OPEN PROTECTION TIMER HAS SUFFICIENT TIME TO
ALLOW FOR FIRST SLOW OPENING WITHOUT TRIPPING (set at elevator Controller).
IF… After reaching full open, DOL is generated but doors close at reduced speed:
1. Check value of “U3” parameter. Increase if set too low.
2. Check that NUDGE speed was not inadvertently selected.
3. Check that HEAVY DOOR was not selected by controller.
4. Be sure learn process was performed correctly.
IF… After reaching full open, DOL is NOT generated and doors close at reduced speed,
there is probably slippage somewhere in the mechanical transmission system and the motor is
still turning when doors are stopped:
1. Tighten belts. Replace if worn. May need grip-notch type belts.
2. If problem persists, decrease “C1” and “Co” parameters.
IF… DOL is generated before doors reach full open and doors stop:
1. Check for excessive friction or an obstacle in path of doors.
2. If first step checks OK, increase “C1” parameter.
IF… After reaching full open, DOL is generated and doors close at correct speed but, when
fully closed, DCL is not generated, there is probably slippage somewhere in the mechanical
transmission system and the motor is still turning when doors are stopped:
1. Tighten belts. Replace if worn. May need grip-notch type belts.
2. Should problem persist, decrease “C3” parameter. Please refer to “Establishing
DCL” on page 17.
3. Should problem persist, repeat learn process.
IF… Red LED turns ON: Please refer to “During opening, doors stop and reverse before
reaching full open, the “C1” parameter may be set too low or there is too much friction: ” on
page 31.
IF… Doors move in close direction but stop before reaching full close and DCL is not gen-
erated:
1. Check that there is no obstruction.
2. Check that torque is sufficient to overcome friction.
3. If everything appears to be OK, increase “C3”.
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