Installation manual

25
Connecting Additional Safety Devices
The Mighty Mule 250 is equipped with built-in obstruction sensitivity. The opener is designed to stop and reverse the gate
for 2 seconds when it comes in contact with an obstruction. However, obstruction sensitivity, although functioning properly,
may not be sensitive enough to prevent bodily injury in some circumstances. To augment your protection against entrap-
ment, GTO recommends using some form of additional safety
device. When installed, contact sensors must be mounted in
compliance with UL 325, Underwriters Laboratories safety
standard for gate openers. Review page 5 for information about
mounting requirements for safety edges ("contact sensors").
Refer to the sensor manufacturer’s instructions for information
about installing these devices on a vehicular gate.
PLEASE NOTE: Contact sensors are not included with the Mighty Mule 250.
The Mighty Mule 250 will ONLY accept accessory devices with normally open contact output.
Make sure the power to the opener is turned off
before connecting safety device wiring to the
terminal blocks. Unplugging the transformer
does not turn power to the opener OFF.
Contact Sensor Input Connection:
Connect one of the contact sensor wires to the COMMON
terminal and the other to the EDGE terminal on the Mighty
Mule 250 control board.
Wire from Contact Sensor (safety edge)
EDGE RED BLK GREEN SAFETY
CYCLE
RADIO
18 VAC
INPUT
LEARN
TRANSMITTER
SET
CLOSE
LIMIT
COMMON
15 AMP
Activation of the contact sensor while the gate is in
motion will cause the gate to stop and reverse for 2
seconds.
Contact Sensors (safety edges)
If not installing a contact sensor skip to next section.
Although GTO strongly recommends the use of additional safety devices, we do not
endorse any specific brand names. Only use products that are certified and listed to be
in compliance with UL (United Laboratories) and national and regional safety codes.
Call GTO Sales at 1-800-543-4283 for information on compatible
products for your specific application.