Starting Out
24
QPAC User's Manual
How to Install and Wire the QPAC, Chapter 2
QPAC System Wiring Example
Overtemperature cutout. The most common failure mode of an SCR is in the
shorted state. If this happens, 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 undervoltage trip or a mechanical contactor as shown above.
System Wiring
Figure 33 -
QPAC System
Wiring Example
∫
WARNING:
Follow National
Electric Code
safety practices
and other locally
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.
∫
(-)
11
12
9 +
Line
Neutral
Fuse
Line
Neutral
Fuse
Line
Neutral
Reset
Switch
Overtemp.
Indicator
Fan
Power
Semi-
conductor
Fuses
L1
T1
L2
T2
L3
(+)
3
QPAC-33
with
AF Control Card
DC Input
Series
147
High Limit
Series 93
Thermocouple Input
Process Output
93BA-1FA0-00RR
1
5
+
-
10 -
5
Circuit Breakers
High
Limit
Con-
tactor
T3
L3L1 T1 L2 T2
Fuse
Tungsten (Lamp)
Infrared Heater
To Next Page
Loading...