E-Mon E-MM-RTU-D-N - Manual (Page 44)

Chapter 4 Power Software Configuration tool General Meter Setup
44 Multi-Mon Multiple Circuit Energy Monitor
Parameter Parameter Parameter Parameter Options Options Options Options Default Default Default Default Description Description Description Description
Energy roll value,
kWh 100000.0 kWh
1000000.0 kWh
10000000.0 kWh
100000000.0 kWh 100000000.0 The value at which energy counters
roll over to zero
Energy LED pulse
rate, Wh/pulse 0.01-100.00 5.40 Wh/pulse
(one equivalent
disk revolution) LED pulse constant - the amount of
accumulated energy (in secondary
readings) giving one pulse via “Wh”.
Energy LED Test Disabled,
Wh Pulses,
varh Pulses Disabled The type of accumulated energy
giving pulses via “Wh” LED.
Energy LED Pulse
source SubMeter 1,
SubMeter 2,
…
SubMeter 40 SubMeter 1 The submeter uses as source of
accumulated energy giving pulses via
“Wh” LED.
Volts Scale, V 60-600 V 600 V The maximum voltage scale allowed,
in secondary volts. See
Data Scales in
Appendix E
Power Calculation Modes Power Calculation Modes Power Calculation Modes Power Calculation Modes
The power calculation mode option allows you to change the method for
calculating reactive and apparent powers in presence of high harmonics. The
options work as follows:
1. When the reactive power calculation mode is selected, active and reactive
powers are measured directly and apparent power is calculated as:
2 2
Q P S + =
This mode is recommended for electrical networks with low harmonic
distortion, commonly with THD < 5% for volts, and THD < 10% for currents.
In networks with high harmonics, the following method is preferable.
2. When the non-active power calculation mode is selected, active power is
measured directly, apparent power is taken as product S = V x I, where V
and I are the RMS volts and amps, and reactive power (called non-active
power) is calculated as:
2 2 P S N − =
Channel Assignments Channel Assignments Channel Assignments Channel Assignments
The Channel Assignments setup allows you to link the device current
terminals to submeters so they can monitor them. Additionally, this setup
allows you to specify the primary current rating of the current transformers
connected to the device terminals. The number of the selected current inputs
for a submeter specifies if it will be a single-, two-, or three-phase meter.
Always selec Always selec Always selec Always select your submeters (both metering and totalization) in a sequence t your submeters (both metering and totalization) in a sequence t your submeters (both metering and totalization) in a sequence t your submeters (both metering and totalization) in a sequence
without gaps so that your device does not occupy unnecessary network without gaps so that your device does not occupy unnecessary network without gaps so that your device does not occupy unnecessary network without gaps so that your device does not occupy unnecessary network
addresses.
addresses. addresses. addresses.
To enter the setup dialog, select the device site from the list box on the
Power Software toolbar, select General Setup from the Meter Setup menu,
and then click on the Channel Assignments tab.