27
Connecting Additional Safety Devices
The Mighty Mule® 500 is equipped with built-in obstruction sensitivity. The opener is designed to stop and reverse the
gate within 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
entrapment,
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 infor-
mation 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
Contact sensors are not
Contact sensors are not
the Mighty Mule® 500.
The Mighty Mule® 500 will ONLY accept accessory devices with normally open dry contact output.
Make sure the power switch 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 OPEN EDGE contact sensor wires to the
COMMON (COM)
terminal and the other to the
OPEN
EDGE
terminal on the Mighty Mule® 500 control board.
Connect one of the CLOSE EDGE contact sensor wires to the
COMMON (COM)
terminal and the other to the
CLOSE
EDGE
terminal on the Mighty Mule® 500 control board.
Activation of a contact sensor while the gate is in motion
will cause the gate to stop and reverse within two (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
specifi c brand names. Only use products that are certifi ed and listed to be in compliance with
any applicable UL standards (United Laboratories) and national and regional safety codes.
Call GTO Sales at 1-800-543-4283 for information on compatible
products for your specifi c application.
Wire from Contact Sensor
(open safety edge)
Wire from Contact Sensor
(close safety edge)
RECEIVER
COM COM
CY
CLE
CL
OSE
SAFETY
EXIT/ OPEN
SHADOW LOOP
CL
OSE
EDGE
OPEN EDGE
BLK
GRN
RED
STALL FORCE
MI
N
MA
X
