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FACTORY AUTOMATION
®
Phone: 248-435-0700 Toll Free: 800-635-0289 Fax: 248-435-8120 www.ametekfactoryautomation.com
Series 120 Motogard
The Series 120 Motogard is designed to take in up
to 3 Thermistors wired in Parallel, and has a single
Triac output relay.
Connections
Power Connections:
The 120 Series Motogard relay is designed to operate
off of /-10%, Single Phase, 50/60Hz.
Connect 120VAC to input terminals 1 and 2.
Thermistor Connections:
1. Connect one lead of each Thermistor to terminals
6, 7, and 8 respectively.
2.
Connect other leads of each Thermistor to
Common, terminal 5.
3.
Maximum number of Thermistors in parallel:
Three (3)
4. Note: If using less than 3 Thermistors. Any
unused input – Install a 150 Ohm 1/2W resistor
from sensor common (terminal 5) to any unused
input.
Output Load Connections:
1. With power applied to the controller and all input
sensors in their low impedance states. Terminal 3
and 4 become the equivalent to a closed contact
of an electromechanical relay.
2. Be sure power is never applied directly across the
contact but always in series with the load.
3. Maximum allowable load – 3 Amps at 120/240VAC.
4.
The closed output of the Motogard Over
temperature Protection System has been
specifically designed to operate directly in
series with most main line contactors. If a small
interposing relay must be used, the sealed burden
shall be greater than 10VA.
