6
FACTORY AUTOMATION
®
Phone: 248-435-0700 Toll Free: 800-635-0289 Fax: 248-435-8120 www.ametekfactoryautomation.com
Series 150 Motogard
The Series 150 Motogard is designed to take in up
to 3 Thermistors wired in Series (1 input), and has a
Form C Mechanical Output relay.
Connections
Power Connections:
The 150 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 the series Thermistor to 3.
2. Connect other lead of the series Thermistor to
terminal 4.
3.
Maximum number of Thermistors in series:
Three (3)
4. Note: Resistance input across terminals 3 and
4 should be between 150 Ohm to 500 Ohm in
ambient conditions. If the resistance measures
less than 150 Ohms a 150 Ohm 1/2W resistor
should be installed in series with the Thermistors
to prevent false trips.
Output Load Connections:
1. Terminals 5, 6 and 7 comprise a set of “Form C”
contacts with terminal 6 common, Terminal 5 is
the open side and Terminal 7 is the closed side.
2. Be sure power is never applied directly across
the contact but always in series with the load.
3.
Maximum allowable load – 4 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 contact
current is greater than 4 Amps, an interposing
relay must be used.
5. The open output of the Series 150 relay can be
used for trip indication.
