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Note: The wirings of input and output terminals of the isolation transformer should select the copper
wires matching the line diameter based on the isolation transformer rated input and output current
(refer to tables in section 5.4). S terminal wiring can select 2×2.5mm
2
yellow-green wire. The
wiring of two ST terminals can select 2×1.5mm
2
shielded twisted pairs, and the wiring should not
be too long.
5.3.2 Wiring mode of AIM-M300(or AIM-M300/SG)
24V, G for the auxiliary power supply, and L1, L2 are connected to the IT system (which can
be connected to the two output terminals of isolation transformer). I0, I1 for the current
transformer signal input, and T0, T1 as the temperature sensor signal input. KE, FE are the functional
grounding wires, which should be connected to the on-site equipotential terminals by two independent
wires.
A and B for RS485 communication terminals, H and L for CAN communication terminal blocks (which
are used for the communication connections with AIL150/AIL160 series insulation fault locator and
AID150 centralized alarm and display device), J1 for over-temperature alarm output (for control
of cooling fan), and J2 for fault alarm relay output.
Note:
1)
is used for the test terminals of CT secondary side short connection.
2) The wirings connecting the No.1 and 2 terminals of the insulation monitoring device to the 24V