WattMaster WCC III part 12 - Manual (Page 26)

WCC III Technical Guide 12-24
12. WCC III INSTALLATION
Proportional-Integral (PI) Output
Board
The Proportional-Integral (PI) Board is a separate integrated circuit
board which works in conjunction with the SAT III controller to
convert a pair of SAT III binary outputs to a varying DC voltage
signal. When one contact on the SAT III controller closes, the
voltage supplied by the PI board will ramp down at a pre-set rate.
When the other SAT III contact closes, the voltage ramps up at
the preset rate. When both contacts are open, the voltage supplied
by the PI board will remain at its present value. The maximum
DC voltage range is 0-14.5 volts, and the minimum allowable
resistance of the controlled device is 1000 ohms. See Section 3 for
further details on Satellite programming instructions.
Figure 12-21: ECC II Analog Output Board
Proportional-Integral (PI) Output Board