• Connect the cables of the serial line A (37), B (36) and C (37) on the ter-
minal block
57
set on the rear of the ABB B21
40
and tighten the screws
(tightening torque 0.25 Nm).
Subsequently the cable must be connected inside the inverter on the
Accessory Board
18
respecting the correspondence between the si-
gnals of the serial line.
Serial line terminal block
of the meter ABB B21
57
Communication and control signal
terminal block
26
of the Accessory
Board
18
B (36) +T/R
A (37) -T/R
C (35) RTN
RS485 METER
To connect the serial cable inside the inverter, refer to the section “Connection of the RS485
line” in this chapter.
• Install the device on the DIN rail and ensure to trigger the xing system
on it
• Once the phase of mechanical installation of the METER is nished, it
is necessary to congure the METER in order to make it compatible with
the inverter. Set the parameters of the meter as set out in the table:
Parameter Settings
Address 1
Protocol MODBUS
Baud rate 19200
Parity EVEN
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