Mitsubishi Electric FR-A800, Instruction Manual

Page: 783 / 1042

Parameters (N) Operation via communication and its settings
FR-A800 5 - 603
Connection of RS-485 terminals and wires
The size of RS-485 terminal block is the same as the control circuit terminal block. Refer to page 2-43
for the wiring method.
Name Description
RDA1 (RXD1+) Inverter r
RDB1 (RXD1 –) Inverter receive –
RDA2 (RXD2+) Inverter r (for branch)
RDB2 (RXD2 –) Inverter receive – (for branch)
SDA1 (TXD1+) Inverter send +
SDB1 (TXD1–) Inverter send –
SDA2 (TXD2+) Inverter send + (for branch)
SDB2 (TXD2 –) Inverter send –(for branch)
P5S (VCC)
5 V
Permissible load current 100 mA
SG (GND)
Earthing (grounding)
(connected to terminal SD)
Tab. 5-265: RS-485 terminal description
NOTES To avoid malfunction, keep the RS-485 terminal wires away from the control circuit board.
When the FR-A820-01250(22K) or lower, or the FR-A840-00620(22K) or lower is used with a plug-in
option, lead the wires through the hole on the side face of the front cover for wiring of the RS-485
terminals.
When the FR-A820-01540(30K) of higher, or the FR-A840-00770(30K) or higher is used with a plug-
in option, lead the wires on the left side of the plug-in option for wiring of the RS-485 terminals.
Cut this part with
a nipper or the like.
Cut off with a
nipper, etc.