Satec PM175 Manual User Manual download pdf (Page 74)

Chapter 4 PAS Application Software

General Meter Setup

Series PM175 Powermeters

Scaling Non-directional Analog Outputs

When programming scales for non-directional analog outputs

with a 0-1mA, 0-20mA or 4-20mA current option, you can

change both zero and full engineering scales for any

parameter. The engineering scale need not be symmetrical.

Scaling Directional Power Factor

The engineering scale for the signed power factor emulates

analog power factor meters. The power factor scale is -0 to +0

and is symmetrical with regard to 1.000 (-1.000  +1.000).

Negative power factor is scaled as -1.000 minus measured

value, and non-negative power factor is scaled as +1.000

minus measured value. To define the entire power factor

range from -0 to +0, the default scales are specified as -0.000

to 0.000.

Scaling ±1 mA Analog Outputs

Programming engineering scales for directional ±1mA analog

outputs depends on whether the output parameter represents

unsigned (as volts and amps) or signed (as powers and power

factor) values.

If the output value is unsigned, you can change both zero and

full engineering scales.

If the parameter represents a signed (directional) value, you

should provide only the engineering scale for the +1 mA output

current. The engineering scale for the 0 mA output current is

always equal to zero for all values except the signed power

factor, for which it is set to 1.000 (see “Scaling Directional

Power Factor” above). The device does not allow you access

to this setting if the parameter is directional. Whenever the

sign of the output parameter is changed to negative, the

device automatically uses your full engineering scale settings

for +1 mA with a negative sign.

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Satec PM175 Manual User Manual Page 74