E-Mon E-PS-E-RTU-N - Manual (Page 84)

Chapter 5 Configuring the PowerSmart+ PQM General Meter Setup
84 PowerSmart+ Power Quality Meter
Scaling Non-Directional Analog Outputs
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). The negative power factor is scaled as -1.000
minus the measured value, and non-negative power factor is scaled as
+1.000 minus the 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 factor) values.
For an unsigned output value, you can change both zero and full
engineering scales.
For a signed (directional) value, you should only provide 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 meter does not allow access to the low scale setting if the parameter
is directional. Whenever the sign of the output parameter is changed to
negative, the meter automatically uses the full engineering scale setting
for +1 mA with a negative sign.
Scaling Analog Outputs for 0-2 mA and ±2 mA
The 0-1mA and ±1mA current outputs provide a 100% overload, and
actually output currents up to 2 mA and ±2mA whenever the output value
exceeds the engineering scale you set for the 1 mA or ±1mA.
The output scales for 0-1 mA and ±1 mA analog outputs are programmed
for 0 mA and +1 mA regardless of the required output current range.
To use the entire output range of 2 mA or ±2 mA, set the analog output
scales as follows:
• 0-2 mA: set the 1 mA scale to ½ of the required full scale output
for uni-directional parameters, and set the 0 mA scale to the
negative full scale and the 1 mA scale to zero for bi-directional
parameters.
• ±2 mA: set the 1 mA scale to ½ of the required full-scale output
for both uni-directional and bi-directional parameters.
For example, to provide the 0 to 2 mA output current range for Volts
measured by the meter in the range of 0 to 120V, set the 1 mA scale to
60V; then the 120V reading will be scaled to 2 mA.
Configuring Counters
The PowerSmart+ PQM has four six-digit general counters that can count
pulses delivered through the device digital inputs with a programmable
scale factor. Each counter can also be incremented in response to any
internal or external event, checked and cleared through the Control
Setpoints.