Manaras Opera MGT - Page 37

37
SYMPTOM PROBABLE CAUSE SUGGESTED ACTION
Reversing devices will
open the door when the
door is closed.
The advanced close limit switch is
defective.
Replace.
The advanced close limit switch is not
being engaged by travelling cam.
The advanced close limit switch needs to
be adjusted just slightly ahead of the end
of travel Close limit switch.
When door closes it
reverses to fully open
after it hits the floor.
The advanced close limit switch is
defective.
Replace.
The advanced close limit switch is not
being engaged by travelling cam.
The advanced close limit switch needs to
be adjusted just slightly ahead of the end
of travel Close limit switch.
A "Close" command is being given.
Check "Close" push-button or any closing
device for short-circuit.
Radio-control does not
function or hesitates for
10 seconds before
working.
It is normal for a radio receiver to take up
to 10 seconds to "warm-up" before being
fully operational. Therefore, when
applying power for the first time, the
radio-control will take 10 seconds before
becoming fully operational.
Check protocol code pins of the
transmitter and receiver: they must be the
same. Press on the transmitter and listen
to the receiver: you should hear a faint
click. The transmitter battery may be
dead or your receiver may need
servicing. To test for radio-control
function, short out momentarily terminals
7 and 8 on the terminal strip. Operator
should function normally. Have the radio-
control verified: the mini-relay inside the
receiver ma
y
be defective.
Motor hums, starts
when s
p
un.
Capacitor defective. Replace
Motor fails to shut off at
fully closed or opened
positions.
Defective limit switch.
Operate limit switch manually while door
is moving. If door does not stop, replace
switch.
Limit cams are not adjusted. Verify and adjust.
Limit drive chain broken. Replace.
Loose sprocket on limit shaft. Tighten set screw.
Limit shaft does not rotate. Verify and replace accordingly.
Motor turns but door
does not move.
Sprocket key is missing. Replace.
Drive chain is broken. Replace.
Clutch is slipping.
A
djust clutch tension.
Motor hums or does not
run.
Door locked or jammed. Verify manual operation of door.
Dead phase (three phase supply).
Check power supply, fuses on each
phase.
Brake does not release.
Check wires to brake solenoid. Verify and
adjust brake tension.
Limit switches do not
hold their setting.
Loose drive or limit chain allows chain to
j
um
p
s
p
rocket teeth.
Adjust chain to proper tension
Limit cam retainer not engaging slots in
limit cams.
Be sure retainer is in slots of BOTH
cams.
Limit cams are binding on shaft threads
which allows them to jump position on
retainer.
Lubricate shaft threads. Limit cams
should turn freely.
Radio-control opens and
reverses the door, but
when the door is fully
opened, will close the
door a little and bounce
back to the open
position again. Door
cannot be closed except
by the "close" push-
button.
The Advanced Open limit switch is
insufficiently advanced from the full Open
limit switch. The contact of the radio-
control receiver is maintained for 1.5
seconds when a command is issued by
the radio transmitter. Therefore, when the
door is fully opened, and a pulse is sent
from the transmitter, the receiver
maintains the contact closed for 1.5
seconds. If the door has closed and the
Advanced Open limit switch has returned
to its normal state, the reversing relay will
be activated, and the door bounces back
to the o
p
en
p
osition.
Adjust the Advanced Open limit switch by
bending the switch arm away from the
Open limit switch arm and more towards
the travelling cam.