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4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Power Requirements
Control Power:
There are 2 options for the Control Power of the KW320 series meter:
Standard: 100~415 VAC (50/60Hz) or 100-300VDC
The meter's typical power consumption is very low and can be supplied by an independent source or by the measured load line. A
regulator or an uninterrupted power supply (UPS) should be used under high power fluctuation conditions. Terminals for the
control power supply are 11, 12 and 13 (L, N and Ground). A switch or circuit-breaker shall be in close proximity to the equipment,
within easy reach of the operator and shall be marked as the disconnecting device for the equipment.
A fuse (typical 1A/250VAC) should be used in the auxiliary power supply loop. No. 13 terminal must be connected to the ground
terminal of the switchgear. An isolated transformer or EMC filter should be used in the control power supply loop if there is a power
quality problem in the power supply.
Choice of wire of power supply is AWG 22-16 or 0.6-1.5 mm2.
Voltage Input
Maximum input voltage for the KW320 series meter shall not exceed 400LN/690LL VAC rms for three phase or 400LN VAC rms
for single phase. Potential Transformer (PT) must be used for high voltage systems. Typical secondary output for PT's shall be
100V or 120V. Please make sure to select an appropriate PT to maintain the measurement accuracy of the meter. When
connecting using the star configuration wiring method, the PT's primary side rated voltage should be equal to or close to the line
voltage of the system. A fuse (typical 1A/250VAC) should be used in the voltage input loop. The wire for voltage input is AWG16-
12 pr 1.3-2.0 mm2.
NOTE In no circumstance should the secondary of the PT be shorted. The secondary of the PT should be grounded at one end.
Please refer to the wiring diagram section for further details.
Current Input:
Current Transformers (CTs) are required in most applications. The KW320 series meter supports two CT input types: 333mV (SC)
or Rogowski coil (RCT). Meter model selection is determined by which style of current transformer input being used. The CT
should be selected to maintain revenue grade accuracy of the system. The distance between CT and the meter should be as short
as possible as the length of the CT leads will have an effect on the accuracy.
The meter requires AWG22-14 as the wire size to the current input terminals.
Specifications subject to change without notice.
Catalog No. 11-808-974-01
Page 12 of 20
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