Chapter 4 PAS Application Software
General Meter Setup
Series PM172 Powermeters
65
Parameter Options
Default
Description
Demand Setup
Power block
demand period
E
1, 2, 3, 5, 10, 15,
20, 30, 60 min,
E=external sync
15 min
The length of the demand period for
power demand calculations. If the
external synchronization is selected, a
pulse front on the digital input DI1
denotes the start of the demand
interval.
Number of blocks in
sliding demand
E
1-15
1
The number of blocks to be averaged
for sliding window demands
Volt/Ampere/THD
demand period
0-1800 sec
900 sec
The length of the demand period for
ampere, volt and THD demand
calculations
1
PT Ratio is defined as a relation of the potential transformer’s primary voltage rating to its
secondary rating. For example, for the 14,400 V transformer’s primary rating and 120 V
secondary rating, the PT Ratio = 14400/120 = 120.
Available wiring modes are listed in the following table.
Wiring
Mode
Description
3OP2
3-wire Open Delta using 2 CTs (2 element)
4LN3
4-wire Wye using 3 PTs (3 element), line-to-neutral voltage readings
3DIR2
3-wire Direct Connection using 2 CTs (2 element)
4LL3
4-wire Wye using 3 PTs (3 element), line-to-line voltage readings
3OP3
3-wire Open Delta using 3 CTs (2½ element)
3LN3
4-wire Wye using 2 PTs (2½ element), line-to-neutral voltage readings
3LL3
4-wire Wye using 2 PTs (2½ element), line-to-line voltage readings
3BLN3
3-wire Broken Delta using 2 PTs, 3 CTs (2½-element), line-to-neutral
voltage readings
3BLL3
3-wire Broken Delta using 2 PTs, 3 CTs (2½-element), line-to-line voltage
readings
Ì
In 4LN3, 3LN3 and 3BLN3 wiring modes, the voltage readings for
min/max volts and volt demands represent line-to-neutral voltages;
otherwise, they will be line-to-line voltages. The voltage waveforms and
harmonics in 4LN3, 4LL3, 3LN3, 3LL3, 3BLN3 and 3BLL3 wiring modes
represent line-to-neutral voltages; otherwise, they will be line-to-line
voltages.
Device Options
This setup allows you to enable or disable optional calculations and redefine
user-selectable device options.
To enter the setup dialog, select the device site from the list box on the PAS
toolbar, and then select Device Options from the Meter Setup menu.
The following table lists available device options.
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
