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IMPORTANT SAFETY INSTRUCTIONS
Secondary Means of Protection Against Entrapment
As specified by Gate Opener Safety Standard, UL 325 (30A.1.1), automatic gate openers shall have an inherent
entrapment sensing system, and shall have provisions for, or be supplied with, at least one independent secondary
means to protect against entrapment. The Mighty Mule utilizes Type A, an inherent (i.e., built-in) entrapment sensing
system as the primary type of entrapment protection. Also, the Mighty Mule has provisions for the connection of Type
B2 protection to be used as the secondary type of entrapment protection, if desired.
1. For gate openers utilizing a contact sensor (e.g., safety edge sensor– Type B2) in accordance with UL 325 (51.8.4
[i]):
A. One or more contact sensors shall be located at the leading edge, bottom edge, and post edge, both inside and
outside of a vehicular swing gate system.
B. A hard wired contact sensor shall be located and its wiring arranged so that the communication between the
sensor and the gate opener is not subjected to mechanical damage.
C. A wireless contact sensor such as one that transmits radio frequency (RF) signals to the gate opener for
entrapment protection functions shall be located where the transmission of the signals are not obstructed or
impeded by building structures, natural landscaping or similar obstruction. A wireless contact sensor shall
function under the intended end-use conditions.
You may want to consider adding photo beams to your installation. GTO Photo Beams [R4222] provide a "non contact"
means of entrapment protection. Call Mightgy Mule Sales at 1-800-543-GATE (4283) for more information.
Photo Beam
Post Edge Contact Sensor
on both sides of the gate
ENTRAPMENT ALARM (UL 325; 30A.1.1A)
The Mighty Mule Gate Opener is designed to stop and reverse within 2 seconds when the gate comes
in contact with an obstruction. Additionally, these openers are equipped with an audio entrapment
alarm which will activate if the unit obstructs twice while opening or closing. This alarm will sound for a
period of 5 minutes, or until the opener receives an intended signal from a hard wired entry/exit source
(e.g. push button control or keypad) and the gate returns to a fully open or fully closed position. Turning
the power switch on the control box OFF and back ON will also deactivate the alarm. Wireless controls
such as transmitters and wireless keypads will not deactivate the alarm.
rev 12-14-15
Leading Edge Contact Sensor
on both sides of the gate
Bottom Edge Contact Sensor
on both sides of the gate
Post Edge Contact Sensor
Photo Beam
on both sides of the gate
Mighty Mule FM402 Installation Instructions
vii
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