ENGINEERING SPECIFICATIONS FOR K4000 SERIES THREE PHASE KILOWATT
HOUR METER
1.1 GENERAL
Submeter for three phase energy billing of kilowatt hours
1. Meter Technology:
a. The meter shall calculate the electrical usage of individual or multiple tenant loads
with the use of remote current transformers. The meter shall use microprocessor-based
technology. The meter shall be capable of sampling each power waveform calculating
power factor and harmonic content, to achieve accurate readings. The meter shall save
the energy readings in non-volatile RAM during power outages. No batteries to be
permitted in the meter.
2. Meter Function:
a. Calibration of the meter shall be a function of the software. The manufacturer shall
use .5% resistors on all analog inputs. The meter shall be designed for lifetime accuracy
using a check sum program embedded in the firmware of the meter.
b. The current transformer circuit on the motherboard shall contain isolating
transformers, (ITF) for total isolation between the secondary side of the current
transformers and the instrument measuring circuit.
c. The meter shall calculate energy consumption on three-phase services, 3 or 4 wire,
using remote CTs to match the amperage of the circuit being monitored.
d. The meter shall contain a relay capable of being programmed for energy counts from
1-1000 watt hours.
e. The meter shall contain an RS 485 RTU ModBus port for remote reading by a PC.
f. The voltage and current terminals shall be removable for field calibration surveys.
3. Meter Display:
a. The meter shall have a LCD display. kWh readings shall be displayed in six digits.
Multipliers to read energy usage shall not be accepted.
b. The screen shall also display Volts, Amps and Real Time kW phase to neutral or
phase to phantom neutral if the meter is on a 3-wire network, up to 999 Amps.
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