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External switches
Half-open
selector switch
~O)
Installed
for double-sliding
or long-stroke
doors. Turning
this
switch ON allows half-open
door operation.
Panic switch
(PS)
Upon receipt of a signal from an emergency
sensor
(optional),
this
switch turns on to open or close the door
(when lOOV AC is supplied)
with an alarm. With an optional
battery
pack, this emergency
operation
is available
even if a power failure occurs.
Emergency
stop
switch
(ES)
Self-holding
switch. Turning
this switch on stops an opening
or
closing door. The door is released by turning
this switch off. Push-
button type.
Half-open
switch
(HS)
Turning
this switch on opens the door constantly
half-way.
For
large-sized,
long-stroke
doors.
Ratchet
switch
(RS)
~
Controlled
by pulse signals. Opens with an ON pulse, and then closes
with the next ON pulse. Available
in kick, foot, and push-button
types.
Safety beam switch
(SB)
Light controlled
sensor switch. When an object blocks the beam
running in front of the door, this switch turns on to stop the
closing door
"and
opens it again. This switch does not operate when
the door is closed.
Sensor switch
(SS)
When turned on, the door opens. When turned off, the door closes.
Available
in heat, radar, or mat types.
3. Drive unit
To prevent
slippage,
the drive belt has teeth which engage with the reduction
gear output
pulley.
The connector
between
the drive belt and the door is made of galvanized
iron
plate.