WattMaster WM-WCC3-TGD-01B - Manual (Page 530)

WCC III Technical Guide 12-34
12. WCC III INSTALLATION
SAT III V-Out
The SAT III controller has the capability of providing 8 analog
output signals which have a maximum range of 0-15 VDC.
These eight voltage outputs can be used to control actuators, and
WattMaster Controls V-Out boards.
Previous “Old” SAT II Type V-Out Binary
Interface Board
A standard SAT III controller is capable of providing 8 analog
outputs and 16 binary outputs. The “older” V-Out Binary Interface
Board (V-Out board) allows the user to obtain additional binary
outputs from the SAT III controller by converting the analog
outputs to binary outputs.
Chip switches located on the “older” V-Out board open and close
based on the 0-15 VDC signal from the analog outputs. The chip
switches on the “older” V-Out boards are not identical to those
used for the binary outputs on the SAT III controller.
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 “older” V-Out board. The
hysteresis is the amount the voltage signal must change before the
relay changes state. The changeover setpoint is set at 7.5 VDC at
the factory, and the hysteresis is set at 2 VDC.
The “older” V-Out 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.
If you have a standard “older” V-Out board, R19 is the potentiometer
which controls the changeover setpoint and is marked “SET 1.”
The potentiometer at R9 controls the value of hysteresis and is
labeled “DELTA B.” To adjust the changeover setpoint, use a
meter to measure the DC voltage between pin 3 of U4 and ground
as you adjust potentiometer R19. To adjust the hysteresis, measure
the DC voltage between pin 5 of U4 and ground as you adjust the
potentiometer at R9.
To understand how the “older” V-Out board works better, consider
a changeover setpoint of 7.5 VDC with a hysteresis of 1 VDC. The
chipswitch on the “older” V-Out board will open when the voltage
is 8.5 VDC and will not close until the voltage drops to 6.5 VDC.
Assume the Analog Input Screen on the WCC III system is set up
according to the following parameters:
When the space temperature rises to 73 °F, the voltage supplied
to the V-Out board from the SAT III controller will be 8.5 VDC
which will cause the relay to open. As the space temperature drops
to 72°F, the voltage supplied to the V-Out board will be 6.5 VDC
which will cause the relay to close.
For the older SAT II controller: The V-Out board can convert from
1 to 8 of the analog outputs to binary outputs. One digital to analog
converter (DAC or V-Out module) is required for each set of 4
analog outputs to be converted to binary outputs. Therefore, if 1
to 4 analog outputs are to be converted to binary outputs, 1 V-Out
module is required, and if 5 to 8 analog outputs are to be converted
to binary outputs, 2 V-Out modules are required. These V-Out
Modules are now built into the SAT III controller and do not need
to be ordered separately.
SAT III V-Out Board