10
Direct wiring (PT Ratio = 1):
Vmax (690 V input option) = 828.0 V
Vmax (120 V input option) = 144.0 V
Pmax = (Imax × Vmax × 3) [kW x 0.001] if wiring mode is 4LN3 or 3LN3
Pmax = (Imax × Vmax × 2) [kW x 0.001] if wiring mode is 4LL3, 3OP2, 3DIR2, 3OP3 or 3LL3
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 [MW x 0.001] if wiring mode is 4LN3 or 3LN3
Pmax = (Imax × Vmax × 2)/1000 [MW x 0.001] if wiring mode is 4LL3, 3OP2, 3DIR2, 3OP3 or 3LL3
2
When ASCII compatibility mode is disabled (see Section 5.5), voltages, currents and powers are always transmitted with a
decimal point at highest resolution available for the field. For direct wiring (PT Ratio = 1), voltages are transmitted in volts,
currents in amperes, and powers in kilowatts. For wiring via PT (PT Ratio > 1), voltages are transmitted in kilovolts,
currents in amperes, and powers in megawatts. When the value is greater than the field width, the right most digits of the
fractional part are truncated. For the best available resolution, see Note
2
to Table 5-7.
When ASCII compatibility mode is enabled, the PM172EH provides a fully downward-compatible response using a lower
resolution for voltages, currents and powers - the value is transmitted as a whole number until the field is filled up, and
then it is converted to higher units and transmitted with a decimal point (when the value is greater than the field width, the
right most digits of the fractional part will be truncated). Voltages are transmitted in volts as whole numbers or in kilovolts
with a decimal point, currents in amperes as whole numbers, and powers in kilowatts as whole numbers or in megawatts
with a decimal point.
3
Energy readings are transmitted in MWh, Mvarh and MVAh units with a decimal point. If the energy value exceeds the field
resolution, the right-most digits are truncated. The energy roll value is user selectable (see Section 5.4).
4
For negative power factor, the minus sign is transmitted before a decimal point as shown in the table.
5
To get block interval demand readings, set the number of demand periods equal to 1 (see Table 4-4).
6
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.
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