© 2005, The Chamberlain Group, Inc.
01-60219 All Rights Reserved Printed in Mexico
INSTALLATION
NOTE: Most units will require that this EXTRA limit switch be 
added to their open limit switch assembly.
1. Install the K1 relay onto the control board of the Mega Arm 
operator.
2. Auxiliary switch mounting: Remove (2) pan head screws 
securing OPEN switch and discard. Mount auxiliary OPEN 
switch on top of existing OPEN switch with (2) pan head 
screws provided (Figures 3 & 4).
3. Run two wires from the second operator’s isolated common 
and normally closed contacts of auxiliary open limit switch 
(provided with kit) to the MEGA ARM J5 #8 and one of the 
commons J5 #9-12.
4. Run two wires from the MEGA ARM’s K1 relay (common and 
normally open) to the second operator’s common and open 
input. J5 #8 was the unused SHADOW LOOP input on the 
MEGA ARM.
NOTES:
• To avoid damage to relay, DO NOT exceed a maximum of 30V
at .5 amps through relay.
• A separate open device (24 hour timer, toggle switch) can be
run to the second operator to control it without raising the 
gate arm. Tampering with the second operator’s safety loops, 
safety edges and reverse sensors WILL NOT cause the arm to 
raise if one tripped. The arm will only raise if an intended open 
signal was sent to the MEGA ARM.
• For motorized teeth, vertical pivot or overhead operator, leave
S1-6, S1-8 OFF (this will keep the K1 relay latched down until 
the arm reaches the down position. This will keep the second 
gate operator locked open or teeth locked down until the arm 
closes completely). In this mode, if the arm senses an impact, 
the K1 relay will stay energized holding open (or teeth down) 
the second operator until the arm times out and closes.
SEQUENCED ACCESS MANAGEMENT OF 
TWO MEGA ARM BARRIERS
(REQUIRES THE OPTIONAL SAMS KIT)
NOTE: (5.20 or greater) can be used when you have two entry 
gates that you want sequence with each other. This is when you 
can only have ONE gate raised at a time (bottle neck or gates at 
a cross street). In this case, which ever one raises first will get 
first priority, while if the other gets an open signal, it will be 
HELD IN MEMORY, then raise once the first gate closes. This 
will work if either gate has a telephone entry unit or access 
device (AVI, prox, etc.).
Connect the K1 relay C and N.O. of each gate to the SHADOW 
LOOP J5 #8 input and common of the other (Figure 2). (Leave 
S1-6 and 8 OFF to allow relay to stay latched.) The auxiliary 
open limit switch will not be used in this installation.
SAMS KIT - PARTS LIST
DESCRIPTION QUANTITY
K1 Relay 1 
Auxiliary Limit Switch 1