Mighty Mule FM500 Green Board - Manual (Page 31)

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 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
specific brand names. Only use products that are certified 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 specific 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