AC voltages and currents can be
applied to the board for testing purposes at these points:
- Terminal blocks J10, J11, and J12 have two positions: the
2nd one corresponding to the Phase Line A, B, and C, respectively. Tie the 1st
position to Neutral.
- Terminal blocks J13, J14, and J15 have three positions,
where the 2nd and 3rd positions on each block are used to connect to the Phase
Line A, B, or C and the shunt is connected to position 1. The 1st position is
the other connection to the shunt. Do not allow the differential voltage across
the 1 and 3 terminals of this terminal block to exceed ±37.5mV.
The HGND terminal can be used to connect the Phase voltage and use this
voltage to reference the current circuitry.
- Terminal block J16 is used to obtain differential voltage across the
shunt for the Neutral and is a three-position terminal block. The 1st position,
which is connected to GND, is the Neutral voltage. Connect the differential
wires from the shunt to the most right and most left positions to measure the
current flowing through. Select the applied current to the input of the shunts
to not exceed the maximum shunt current allowed, for example, 120A. In addition,
before performing any test, verify that this terminal block is securely
connected to the output leads of the shunt.