Starting Out
21
QPAC User's Manual
How to Install and Wire the QPAC, Chapter 2
Current Transformer Description Interstage
(Part Number) Transformer
16-0246* 20A : 20mA Current Transformer Not Used
16-0246* 30A : 30mA Current Transformer Not Used
16-0246* 40A : 40mA Current Transformer Not Used
16-0246* 50A : 50mA Current Transformer Not Used
16-0008 **75A : 5A Current Transformer 16-0176
16-0044 100A : 5A Current Transformer 16-0176
16-0072 125A : 5A Current Transformer 16-0176
16-0008 150A : 5A Current Transformer 16-0176
16-0045 200A : 5A Current Transformer 16-0176
16-0073 300A : 5A Current Transformer 16-0176
Not Used 5A : 20mA Interstage Transformer 16-0176
Note: *With Wire Leads.
**Use two wire passes through current transformer #16-0008 for 75A applications.
Input Wiring
Figure 28 -
AF, AL,
BF and BV
Auto/Manual Input
AF, AL, BF and BV Auto/Manual Input
The AF, AL, BF and BV Control Cards can be wired to make it possible to
select an input from either a temperature control or a manual input potentiome-
ter. A switch is used to select between the input from a 1KΩ potentiometer or a
4-20mA temperature control. The control card must be converted to voltage
input by removing the appropriate resistor or replacing a jumper. See Page 25.
A 250Ω resistor must be placed in parallel with the temperature control input,
so that the temperature control signal will be a 1-5 volt input.
Interlock
Opening the interlock connection between Pins 1 and 2 of the input signal
connector will interrupt the input signal to the control card. Do not use the interlock
for limit or safety functions. Do not open the AF or AL Control Card interlock,
terminals 1 & 2, when "soft start" is desirable.
Soft Start
Some heater elements change resistance with temperature. Certain types
such as tungsten, change resistance very fast (tungsten increases resistance
over 16 times from cold to hot). By slowly increasing the voltage to the heater,
the heater element is warmed to full resistance by the time full voltage is
applied, thus reducing excessive surge currents. Soft start time on the QPAC
is about 6 seconds from power-up. If the QPAC is forced into emergency shut
down (ESD) the QPAC will re-start soft.
Soft start is only available on phase
angle models.
AL Control Card Current Transformer Connections
The AL Control Card is wired to a transformer from the load line of the QPAC.
The transformer is wired into Pins 1 and 2 of Connector TB3 of the AL card.
The following table and figures show the transformer connections for different
load configurations and currents.
Table 6 -
AL Control Card,
Current Transformer
Selection
Motherboard Connector
250Ω
1KΩ Pot
2.19 - 2.75
(56 - 57mm)
CW
CCW
Pot
1
5-
+
2.75 - 3.75 (70 - 95mm)
DC Input
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