SATEC PM180 Operation Manual - Manual (Page 75)

‎Chapter 7 Programming the PM180 Programming Analog Outputs
PM180 Substation Automation Unit 73
When you select an output parameter for the analog output channel, the default
engineering scales are set automatically. They represent the maximum available
scales for the parameter. If the parameter actually covers a lower range, you can
change the scales to provide a better resolution on the analog output.
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. An example is shown in the picture above for the 0-20 mA analog
outputs. 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 ±1mA 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 factors) 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.