Offset/Polarity Values - Carrier TruVu VVTBP-E2 Installation And Startup Manual

Offset/Polarity values

Offset/Polarity is not particular to a type of input or output, but the driver handles analog and binary inputs and
outputs differently. To set these values appropriately, you should understand how the driver uses them.
Offset/Polarity
Analog Input (BAI)
Analog Output (BAO) You can use the Offset value (positive or negative) to calibrate an output, but you generally
Binary Input (BBI)
Binary Output (BBO)
TruVu™ VVTBP-E2
Installation and Start-up Guide
Notes
Offset value (positive or negative) adds a fine adjustment to a sensor reading after all
scaling for calibration.
EXAMPLE If a sensor reads 74.9°F when the actual measured value is 73.6°F, enter an
Offset of –1.3 to calibrate the sensor to the measured value.
do not need to. If used, the driver adds the offset value to the wire input value before
performing any scaling calculations to determine the TV-VVTBP-E2's output.
Polarity determines the microblock's present value when no signal is received from the
equipment.
When no signal is received from the equipment, if Polarity is set to:
normal—present value is off
reversed—present value is on
Polarity determines the TV-VVTBP-E2's output based on the control program's signal to the
microblock.
When the control program's signal to the microblock is on, if Polarity is set to:
normal—output is on
reversed—output is off
NOTE Regardless of Polarity, the output will be off if the TV-VVTBP-E2 loses power.
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To adjust input and output properties
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