Watlow QPAC - Manual (Page 15)

QPAC User's Guide 15 Chapter 2: Install & Wire
Motherboard Connector
38mm
(1.50 in)
51mm
(2.00 in)
1
2 (+)
3 (-)
08-5286
Input Wiring
CD Control Card, Solid-
State Contactor, Contact
Closure Input.
CD Control Card — Contact Closure Input Contactor
For a contact closure input to the CD Control Card, the contact is wired to
pins 1 and 2 (+) of the input signal connector. A closed contactor input turns
the QPAC on and an open contact turns the QPAC off. The input impedance
is 10KΩ minimum.
AF, AL, BF, BV
Potentiometer Input.
Process Input - AF, AL, BF and BV Control Cards
The QPAC AF, AL, BF and BV Control Cards are defined as follows:
AF - Phase Angle Control
AL - Phase Angle Control with Current Limit
BF - Burst Firing (Zero Cross), Fixed Time Base
BV - Burst Firing (Zero Cross), Variable Time Base
All four of these cards can be wired for a manual potentiometer input or an
input from a temperature control. The following paragraphs give the connec-
tions for both configurations including an Auto/Manual configuration where
the input can be switched between manual and temperature control input.
AF, AL, BF and BV Potentiometer Input
For potentiometer input, wire a 1KΩ potentiometer to the “POT”, “+” and “-” con-
nections of the control card. The wiper of the potentiometer should be connect-
ed to the “+” connection. The control card must be converted to a voltage input
by replacing a jumper. See "Bias and Gain Adjustments," Chapter 3.
Motherboard Connector
1KΩ Pot
56 to 57mm
(2.19 to 2.75 in)
CW-
CCW+
Pot
1
5 -
+
70 to 95mm
(2.75 to 3.75 in)
requires 0 to
5VÎ (dc) input
card setting
Input Ranges
0 to 5V Î (dc)
1 to 5V Î (dc)
0 to 10V Î (dc)
0 to 20mA (dc)
4 to 20mA (dc)
1KΩ potentiometer