MID STOP
MODIFICATION
MINI LIMIT SWITCHES
71909207
APPLICATION
This modification is available to models T, GT, APT, J, H,
GH, SD and GSD standard door operators with 24V control
circuits. Not for use with Solid State Logic Control
Board (L).
The operator must have C2/B2 control wiring.
Not available with Hazardous Area or Variable Speed
Modifications.
A one button radio control cannot be used. In order to use a
radio control you need a 2 channel receiver and remote. One
channel to open and the other to close.
• To prevent possible SERIOUS INJURY or DEATH,
disconnect electric power to operator BEFORE
installing.
• ALL electrical connections MUST be made by a
qualified individual.
FUNCTIONS
Provides capability of stopping the door while opening a
pre-set mid position.
Constant pressure on the open button will fully open the
door (on a very high door the coil might relatch before fully
open but the limit switches will shut it off). The switch will
have no effect on the close travel.
CARTON INVENTORY
DESCRIPTION
Instructions
Screw, #8-32 x 1/4" Lg Pan Head Phillips Self Tap
Wire 18ga Red 10" .110 Faston X .187 Faston
QTY
1
3
1
DESCRIPTION
Mid-Stop Switch Bracket Assembly
Auxiliary Limit Switch
Wiring Diagram
Wiring Diagram
QTY
1
1
1
1
* Shipped with 1Ø Operators
** Shipped with 3Ø Operators
I N S TA L L AT I O N I N S T R U C T I O N S
1. Disconnect power to operator.
2. Locate the new bracket assembly with the limit
switch attached.
3. Before installing the new bracket inside the box, first
run the wires from the top limit switches along side the
bracket on the contactor side of the box. Next run the
wires from the bottom limit switches through the cut
out in the bracket. Be sure not to pinch wires under the
bracket (figure 1). Fasten the bracket down with the two
screws provided (figure 2).
4. Locate the yellow wire on terminal #3 and move to
terminal #1.
5. Locate the red wire that runs from (R3) on the radio
terminal block to the relay coil on the (R1) relay.
Remove the end connected to the relay coil. Tape or cap
end to prevent shorting out.
6. Install a new red wire from the relay coil (step 5) to (A2)
on the open contactor.
7. Locate the yellow wire from common on the auxiliary
open limit switch. Move to common on the new
mid-stop switch.
8. Locate the orange wire from normally close on the
auxiliary open limit switch. Move to normally closed on
the new mid-stop switch.
9. Adjust bracket so limit nut actuates switch in passing.
10. Adjust mid-stop switch for desired opening height by
moving it on bracket.
Figure 2
(2) #8 32 X 1/4" Long Pan
Head Phillips Self taping
Screws
Mid Stop Switch
Bracket Assembly
Figure 1
Terminal Block
IR Relay
R1 Relay
Contactor
Transformer
(3) #8 32 X 1/4" Long Pan
Head Phillips Self taping
Screws
Mid Stop Switch
Bracket Assembly
Run Wires From Bottom Limit
Switches Through Cut Out
In Bracket.
Mid Stop Switch
Bracket Assembly
Radio Terminal
Block
Run Wires From Top Limit
Switches Around Outside Of
Bracket.
R A D I O C O N T R O L C O N F I G U R AT I O N S
It will be necessary to use a two channel receiver and
remote. One channel will be used to open. The other channel
will be used to close.
If your receiver has terminals 1, 2 and 3 and two separate
wires for the second channel, connect as follows:
• Radio 1 will connect to terminal 3 in the operator,
• Radio 2 will connect to terminal 1 in the operator,
• Radio 3 will connect into the wire nut in the operator
control box – this wire nut connects a yellow, purple
and orange wire. This channel will open.
01-11602D
If your operator has an external radio terminal, the radio will
only open to mid stop. Connect the wires as follows:
• Connect the two wires for the second channel to
terminals 3 and 2 of the main terminal strip. This
channel will close.
If your receiver has 6 wires – 2 for power, 2 for one channel
and 2 for second channel, connect wires as follows:
• Connect power to terminal 5 and into the wire nut as
described in section A. One channel connects to
terminals 1 and 3 (to open). The second channel
connects to terminals 2 and 3. This channel will close.
© 2008, The Chamber a n Group, Inc.
A R ghts Reserved