Chamberlain LiftMaster Professional SL540 Manual page 5

U L 3 2 5 M O D E L C L A S S I F I C A T I O N S c o n t ' d
SAFETY ACCESSORY SELECTION
All UL325 compliant LiftMaster gate operators will accept external
entrapment protection devices to protect people from motorized
gate systems. UL325 requires that the type of entrapment
protection correctly matches each gate application. Below are the
six types of entrapment protection recognized by UL325 for use
on this operator.
ENTRAPMENT PROTECTION TYPES
Type A: Inherent obstruction sensing system, self-contained
within the operator. This system must sense and initiate
the reverse of the gate within two seconds of contact
with a solid object.
Type B1: Connections provided for a non-contact device, such as
a photo eye can be used as a secondary protection.
Type B2: Connections provided for a contact sensor. A contact
device such as a gate edge can be used for secondary
protection.
Type C: Inherent adjustable clutch or pressure relief valve.
Type D: Connections provided for a control requiring continuous
pressure to operate the operator open and close.
Type E: Built-in audio alarm. Examples
include sirens, horns or buzzers.
NOTE: UL requires that all installations must
have warning signs placed in plain view on
both sides of the gate to warn pedestrians of
the dangers of motorized gate systems. Many
signs and labels are included with each
operator.
This document is current with the UL325 specification at the
time of printing. However, please check the most current
version of UL325 for update information.
UL325 ENTRAPMENT PROTECTION REQUIREMENTS
UL325
Installation
Class
Class
I & II
Class III
Class IV
The chart above illustrates the entrapment protection
requirements for each of the four UL325 classes. (For more
information on UL325 classes, refer to the previous page.)
In order to complete a proper installation you must satisfy the
entrapment protection chart shown above. That means that
the installation must have one primary means of entrapment
protection and one independent secondary means of
entrapment protection. Both primary and secondary
entrapment protection methods must be designed, arranged
or configured to protect against entrapments in both the open
and close directions of gate travel.
For Example: For a slide gate system that is installed on a
Moving Gate Can Cause
single-family residence (UL325 Class I) you must provide the
Injury or Death
KEEP CLEAR! Gate may move at any
following: As your primary type of entrapment protection you
time without prior warning.
Do not let children operate the gate or
must provide Type A inherent (built into the operator)
play in the gate area.
This entrance is for vehicles only .
Pedestrians must use separate entrance entrapment sensing and at least one of the following as your
secondary entrapment protection:
• Type B1 - Non-contact sensors such as photo-eyes
• Type B2 - Contact sensors such as gate edges or
• Type D - Constant pressure control
5
GATE OPERATOR ENTRAPMENT PROTECTION
Slide Gate Operator
Primary Secondary
Type Type
B1, B2
A
or D
A, B1, B2 A, B1, D
or E
or B2
A, B1, B2 A, B1, B2,
D or E
or D
Swing & Gate Barrier
(Arm) Operator
Primary Secondary
Type Type
A, B1, C or
A or C
DA, B1
A, B1, C
D or E
or C
A, B1, C A, B1, C,
or D D or E