Watlow QPAC - Manual (Page 16)

16 QPAC User's Guide Chapter 2: Install & Wire
Input Wiring
AF, AL, BF and BV dc
Input.
AF, AL, BF and BV DC Input Connections
The temperature control output to the Control Cards is wired to the “+” and “-”
input terminals of the control card. These cards will accept a 0 to 12VÎ (dc),
or 0 to 25mA input signal. They are factory calibrated for 4 to 20mA. If using
a voltage or current range other than this, follow bias and gain adjustment in-
structions in Chapter 3. The control card can be converted to a voltage input
by removing a resistor or moving a jumper. Follow voltage input conversion
instructions in Chapter 3.
Motherboard Connector
DC Input
+
-
56 to 57mm
(2.19 to 2.75 in) Pot
1
5 -
+
70 to 95mm
(2.75 to 3.75 in)
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 potentiom-
eter. A switch is used to select between the input from a 1KΩ potentiometer
or a 4 to 20mA temperature control. The control card must be converted to
voltage input by removing the appropriate resistor or replacing a jumper. See
"Voltage Input Conversions," Chapter 3. A 250Ω resistor must be placed in
parallel with the temperature control input, so that the temperature control
signal will be a 1 to 5VÎ (dc) input.
Motherboard Connector
250Ω
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)
DC Input
Interlock
(Available on the AF, AL, BF and BV input card options.)
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 and 2, when "soft start" is desirable.
AF, AL, BF and BV Auto/
Manual Input.