Watlow QPAC Manuale Utente Scaricare il pdf (Pagina 20)

20 QPAC User's Guide Chapter 2: Install & Wire

QPAC system Wiring Example

The most common failure mode of an SCR is in the shorted state. If this hap-

pens, the temperature control can no longer control the SCR and a run-away

condition exists. An independent high limit control must be used that will

sense unsafe temperature and disengage the circuit breaker via undervolt-

age trip or a mechanical contactor as shown below.

System Wiring

QPAC System Wiring

Example, Overtemperature

Cutout.

∫

WARNING:

Follow National

Electric Code safety

practices and other lo-

cally applicable codes to

avoid potential electric

shock when wiring this

unit to a power source,

and to electrical sensors

or peripheral devices.

Failure to do so could

result in serious injury or

death.

PM6C2FA - ALAJAAA

RY1

Q32-202-300-BV0

T1L1

Limit

Thermocouple

Controller

Thermocouple

2ASB

208/120V

Fan Assembly

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Watlow QPAC Manuale Utente Pagina 20