WattMaster WCC II - Manual (Page 223)

Section 5: Installation Guide
WCC II Operator’s Guide
Operator Interfaces 5-21
Proportional-Integral (PI) Output Board
The Proportional-Integral (PI) Board is a separate integrated circuit
board which works in conjunction with the SAT II controller to
convert a pair of SAT II binary outputs to a varying DC voltage
signal. When one contact on the SAT II controller closes, the voltage
supplied by the PI board will ramp down at a pre-set rate. When
the other SAT II 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.
The DC voltage range along with the ramp speed is set at the PI
board. The ramp speed can be adjusted from 28 seconds to 38
minutes, and the maximum range is 0-14.5 volts DC.