E-Mon E-PS-A-RTU-N - Manual (Page 63)

Chapter 4 Power
S O F T W A R E G E N E R A L M E T E R S E T U P
PowerSmart+ Advanced Power Quality Meter 63
Parameter Options Default Description
Power Calculation
Mode S=f(P, Q) (using
reactive power),
Q=f(S, P) (using
non-active power) S=f(P, Q) The method used for calculating
reactive and apparent powers
(see “Power Calculation Modes”
below)
Energy Roll Value 1000.0 kWh
10000.0 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
Phase Energy
Calculation Disabled, Enabled Disabled Enables phase energy calculations
Analog Expander
Option
1
Disabled
0-20 mA
4-20 mA
0-1 mA
±1 mA Disabled Enables outputs for the AX-8
analog expanders through port
COM2. See “Programming the
Analog Expander”
Backup Battery OFF = switched OFF
On = switched ON OFF Allows to conserve a battery while
the meter is out of operation
Energy Test Mode OFF = disabled
Wh pulses
varh pulses
Disabled Setting this option puts the meter
into the energy test mode
Volts Scale, V 10-828 V 144 V The maximum voltage scale
allowed, in secondary volts. See
Data Scales in Appendix F
Amps Scale, A 2 × nominal CT
secondary current
(2A, 10A) 2A/10 A The maximum current scale
allowed, in secondary amps. Not
changeable. See
Data Scales in
Appendix F
1 Do not enable the analog expander output if you do not have the analog expander
connected to the meter, otherwise it will disturb the computer communications.
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 − =
Local Settings Local Settings Local Settings Local Settings
This setup allows you to specify your time zone and daylight savings time options.
To configure the time zone options for your device, 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 Local Settings tab.