Technical Reference Manual-XPM3m Revision Date: August 2014
HEAT CONTROL OVERVIEW
The electrical portion of the Heat Control System consists of three major parts:
1) POWER SOURCE:
Three Phase power is provided to the line terminals of the Heater Contactor (K2).
2) CONTROL ELEMENTS:
A) POWER DEVICES:
HEATER CONTACTOR (K2) coil is energized by I/0 Board Output Relay A1-K4, (see Interlocks, below) it’s
contacts close, three phase power is permitted to flow to the Heater CIRCUIT BREAKER(s). (Each Heater
has it’s own Circuit Breaker) and to the SSRs (one Solid State Relay for each Heater) which is the final
Heater power control element.
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