Mighty Mule FM502 Dual Swing - Blue Board - Manual (Page 32)

28
Connecting Additional Safety Devices
The Mighty Mule® 502 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® 502.
The Mighty Mule® 502 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® 502
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® 502
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 safetystandards (Underwriters 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
ALM
GTO RCVR.
BLK
CO
M
GRN BLK RE
D
CY
CLE
SAFE
TY
EXI
T
SHADOW
OPEN EDGE CO
M
CONTROL INPUTS
CL
OS
E
EDGE
NOTE: If the close edge is contacted when the gate is opening, nothing happens. If the close edge
is contacted when the gate is closing, then it reverses. If the open edge is contacted when the gate is
closing, nothing happens. If the open edge is contacted when the gate is opening, then it reverses.