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2472 DI HEATER OPERATION / MAINTENANCE MANUAL
PAGE 5
2.1.c Caution
A Caution message indicates a potentially hazardous situation, which, if
not avoided, could result in minor or moderate injury. It may also be used
to alert against unsafe practices. Following is a typical example of a
Caution
message as it could appear:
2.2 EQUIPMENT SAFETY
The rest of this section describes equipment safety features:
Equipment Safety Interlocks
Emergency Off Pushbuttons
Main Power Disconnect Switch
Lockout/Tagout Information
Equipment Safety Labels
Hazard Lights
2.3 INTERLOCKS
!
WARNING:
The high voltage interlock circuit does not remove high
voltage from the circuit breaker, contactor, and the control
transformer. Only authorized, qualified, trained personnel should
service this equipment.
2.3.a Over Temperature Controller Interlock (OTC)
The OTC disengages power to the heater components when it detects a
heater module temperature over 105
C (221
F). The over temperature
fault LED will indicate a failure has occurred and the display of the OTC
causing the fault will flash “ALR”. The OTC’s will disengage power and a
manual reset will be required by pressing HEATER ON (see Section 8,
Troubleshooting).
