15
1
The parameter limits are as follows:
Imax
(x150% over-range) = 1.5
×
CT primary current [A]
Direct wiring (PT Ratio = 1):
Vmax
(690 V input option) = 828 V
Vmax
(120 V input option) = 144 V
Wiring via PTs (PT Ratio > 1):
Vmax
(690 V input option) = 144
×
PT Ratio [V]
Vmax
(120 V input option) = 144
×
PT Ratio [V]
Pmax
= (Imax
×
Vmax
×
3)/1000 [kW] if wiring mode is 4LN3 or 3LN3
Pmax
= (Imax
×
Vmax
×
2)/1000 [kW] if wiring mode is 4LL3, 3OP2, 3DIR2, 3OP3 or 3LL3
2
Positive readings of kvarh net
3
Negative readings of kvarh net
4
To get block interval demand readings, specify the number of demand periods equal to 1 (see Table 5-2)
5
When the 4LN3 or 3LN3 wiring mode is selected, the voltages will be line-to-neutral; for any other wiring mode,
they will be line-to-line voltages.
6
In the 4LN3, 4LL3, 3LN3, 3LL3 and 3DIR2 wiring modes, the harmonic voltages will represent line-to-neutral
voltages; in the 3OP2 and 3OP3 wiring modes, they will comprise L12 and L23 line-to-line voltages.
NOTE
Writing a zero to one of registers 280-286 causes reset of all maximum demands. Writing a zero to
one of registers 287-294 and 301-302 causes reset of all accumulated energies.
5.2 Basic Setup
Table 5-2 Basic Setup Registers
Parameter
Address Type
R/W Range
Wiring mode
1
2304
UINT16 R/W
0 = 3OP2, 1 = 4LN3, 2 = 3DIR2, 3 = 4LL3, 4 = 3OP3, 5 =
3LN3, 6 = 3LL3
PT ratio
2305
UINT16 R/W
10 to 65000
×
0.1
CT primary current
2306
UINT16 R/W
1 to 10000 A
Power demand period
2307
UINT16 R/W
1,2,5,10,15,20,30,60 min, 255 = external synchronization
2
Volt/ampere demand period
2308
UINT16 R/W
0 to 1800 sec
Averaging buffer size
2309
UINT16 R/W
8, 16, 32
Reset enable/disable
2310
UINT16 R/W
0 = disable, 1 = enable
Reserved
2311
UINT16 R
Read as 65535
The number of demand periods 2312
UINT16 R/W
1 to 15
Reserved
2313
UINT16 R
Read as 65535
Reserved
2314
UINT16 R
Read as 65535
Nominal frequency
2315
UINT16 R/W
50, 60 Hz
Maximum demand load current 2316
UINT16 R/W
0 to 10000 A (0 = CT primary current)
1
The wiring mode options are as follows:
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 (2 1/2 element)
3LN3 - 4-wire WYE using 2 PTs (2 1/2 element), line to neutral voltage readings
3LL3 - 4-wire WYE using 2 PTs (2 1/2 element), line to line voltage readings
2
Synchronization of power demand interval can be made through communications using the synchronize power
demand interval command (see Table 5-5)
