WattMaster WCC II - Manual (Page 220)

Section 5: Installation Guide
WCC II Operator’s Guide
Operator Interfaces 5-18
V-Out Binary Interface Board
A standard SAT II controller is capable of providing 8 analog
outputs and 16 binary outputs. The V-Out Binary Interface Board
( V-out board) allows the user to obtain additional binary outputs
from the SAT II controller by converting the analog outputs to
binary outputs.
Chip switches located on the V-out board open and close based on
the 0-15 VDC signal from the analog outputs. The chip switches
on the V-out board are identical to those used for the binary outputs
on the SAT II controller and are the electronic equivalent of a relay
used to complete a 24 VAC circuit to energize on/off devices such
as relays.
The changeover setpoint along with the hysteresis is adjustable at
the V-out board. The changeover setpoint is the DC voltage required
to open the chip switches on the V-out board. The hysteresis is the
amount the voltage signal must change before the switch changes
state. The changeover setpoint is set at 7.5 VDC at the factory, and
the hysteresis is set at 2 VDC.
The board has one changeover setpoint and one hysteresis setpoint
which affects all eight binary outputs unless optional potentiometers
are ordered separately. One potentiometer is required for each
separate changeover setpoint, and one potentiometer is required
for each separate hysteresis setpoint. Therefore, a binary output
board with a separate changeover and hysteresis setpoint for each
binary output would require 16 potentiometers.
Each binary output on the V-out board has a chip located near it
which is labeled “LTC 1041.” The DC voltage difference between
pin 3 on this chip and ground is the DC voltage required to open
the binary output contact. The DC voltage between pin 5 on the
“LTC 1041” chip and ground is the value of the hysteresis for
the binary output. The voltage between pin 3 and ground and
pin 5 and ground can be changed by adjusting the corresponding
potentiometer.
If you have a standard V-out board, R19 is the potentiometer
which controls the changeover setpoint and is marked “SET 1.”
Potentiometer R9 controls the value of hysteresis and is labeled
“DELTA 1.” To adjust the changeover setpoint, use a meter to
measure the DC voltage between pin 3 and ground as you adjust
potentiometer R19, and to adjust the hysteresis, measure the DC
voltage between pin 5 and ground as you adjust potentiometer
R9.