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6.2 Main Power Board Connections (continued)
D. Connect the three AC main power wires (Phases A, B and C) to their respec-
tive positions as labeled on terminal block TB1. After all conductors are con-
nected to each of their respective terminal block positions and tightened to 7
in-lb, verify that each terminal block screw is securely fastened by gently tug-
ging on each conductor. Verify that no conductor wires are frayed or shorting
to adjacent terminal block positions. For single phase connection: connect
two ac main power wires to phases a and b and a jumper wire from b to c -
factory installed for the Single Phase option.
E. Turn ON the AC main power input. The meter display will light up and scroll
through 6 displays. Each display is visible for 5 seconds. Display screens are
as follows:
Screen 1 - Total kilowatt-hours (kWh) consumed
Screen 2 - Peak demand (kW) with date & time stamp
Screen 3 - Actual load (kW)
Screen 4 - RMS Amps
Screen 5 - RMS Volts Phase to Neutral
Screen 6 - RMS Volts Phase to Phase
Screen 7 - Power factor (PF) per phase
F. Verify the voltage readings on Screen 5 using an AC voltmeter. Typical read-
ings shown below are measured phase to neutral (L-N) for 4 wire and phase
to phase (L-L) for 3 wire. Readings should be +/- 10% of nominal.
Meter Type
120/208V, 3ø, 4 Wire
120/240V, 1ø, 3 Wire
120V, 1ø, 2 Wire
277/480V , 3ø, 4 Wire
277V, 1ø, 2 Wire
240V, 3ø, 3 Wire
400V, 3ø, 4 Wire
(380V, 400V, 415V)
480V, 3ø, 3 Wire
600V, 3ø, 4 Wire (WYE
only)
NOTE: Meters are powered by phases A and B. The displayed voltages will be the
measured AC voltage between phases.
Nominal Voltage
120 VAC (L-N)
277 VAC (L-N)
240 VAC (L-L)
230 VAC (L-N)
480 VAC (L-L)
347 VAC (L-N)
15
CLASS 320 METER
Limits (+/- 10%)
108 to 132 VAC
249 to 305 VAC
216 to 264 VAC
207 to 253 VAC
432 to 528 VAC
312 to 380 VAC
62-0397-02
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