4-12
Adjustments and Status LEDs
Magnum 4A Control Wiring and Adjustment Manual
Part #C-00084
Rev. 9-09-16
Recommended settings correspond with positions on a clock with 12 o’clock at the top as the starting
point. Potentiometer settings might need to be adjusted accordingly. After each adjustment, wait at least 5
seconds before testing.
All electrical troubleshooting or service must be performed by trained, qualified
technicians and comply with all applicable governing agency codes.
Table 4-2
Potentiometers
Potentiometer
Description
Stop
X
Stops or slows door when object is detected in path of opening door (not yet in
Back Check).
X
Turn Potentiometer:
•
Clockwise = door stops and creeps open
•
Counterclockwise = door stops and closes
X
Also adjusts the power to the motor when the door is held open for extended periods
of time. The motor power is reduced from “back-check” power to “Stop” power
(assuming “stop” power is lower than “back-check” power) This reduces the risk of
the motor overheating at hold open allowing the door to close as well as reducing
stress on mechanical and electrical components. To adjust power applied to the door
at hold open:
1.►Turn STOP potentiometer fully counterclockwise
2.►Place the “on-off-hold open” switch to hold open
3.►After the door has been in the back-check area for 8 seconds, motor power will
be reduced according to the “STOP” setting. If the door begins to slowly drift close
turn the “STOP” potentiometer slightly clockwise to increase power.
4.►Turn “On/Off/Hold Open” switch off and allow the door to time out and fully close
5.►Turn the “On/Off/Hold Open” switch to hold open again and observe door at the
full open position. Door should hold open and not drift close.
a.►
If door still drifts close, continue increasing STOP power until the door holds
open against the door stop.
b.►
Each time an adjustment is made, the door must be allowed to close, and then
reactivated for the change to take place.
Event
Action
Object is detected in path of
opening door by Door Mounted
Sensor that is mounted on swing
side of door and connected to
Terminal 3 and 5 on Magnum 4A
Control.
X
Recommended start position 12 o’clock.
X
Clockwise: Opens door at slower speed.
X
Counterclockwise: Door will stop.
Open
Sets opening speed of door.
Event
Action
Door opened at wrong speed.
X
Recommended start position 12 o’clock.
X
Clockwise: Door will open faster.
X
Counterclockwise: Door will open slower.
BCHK
(Back Check)
Sets Back Check speed.
Event
Action
Back check speed requires
adjustment.
X
Recommended start position 11 o’clock.
X
Clockwise: Increases Back Check speed.
X
Counterclockwise: Decreases Back Check speed.
CAUTION
