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23
Setup & Opera tion
CLASSIC 800 Product Manual
Failsafe Relay Configurations
The term “Fail-safe” refers to a method of wiring and programming control instrumentation commonly used
in hazardous locations/applications.
•
In a “Fail-safe” application the CLASSIC 800 switch/transmitter is wired and programmed so that
the output relay is energized in normal process operating condition.
•
Thus, in the ev
ent of a power failure, cable break, self-test failure, or other loss of electrical power,
the contact is “opened”, the relay is de-energized and an alarm will result.
A common “Fail-safe” setup for
NO FLOW CONDITION, PUMP PROTECTION
:
•
Connect the relay contact wires to Normally Open (R1 NO, R1 CM)
•
Program the relay(s) to energize abov
e set point.
•
Depending on application and setup of the switch/transmitter, the relay contact(s) will OPEN (de-
energize) when:
a.
The Thermal Signal decreases due to a decrease or loss of flow/lev
el.
b.
Power is lost to the switch/transmitter as described abov
e.
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Summary of Contents for CLASSIC 800 Series
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