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Communication operation and setting
4.19 Communication operation and setting
4.19.1 Wiring and configuration of PU connector
Using the PU connector, you can perform communication operation from a personal computer, etc.
When the PU connector is connected with a personal, FA or other computer by a communication cable, a user program can
run and monitor the inverter or read and write to parameters.
(1) PU connector pin-outs
Purpose Parameter that should be Set Refer to Page
Communication operation from PU
connector
Initial setting of computer link
communication (PU connector)
Pr. 117 to Pr. 124
183
Modbus-RTU communication
specifications
Pr. 117, Pr. 118, Pr. 120, Pr.
122, Pr. 343, Pr. 502, Pr. 549
200
Restrictions on parameter write
through communication
Communication EEPROM write
selection
Pr. 342
187
Pin Number Name Description
1) SG
Earth (ground)
(connected to terminal 5)
2) — Parameter unit power supply
3) RDA Inverter receive+
4) SDB Inverter send-
5) SDA Inverter send+
6) RDB Inverter receive-
7) SG
Earth (ground)
(connected to terminal 5)
8) — Parameter unit power supply
NOTE
Pins No. 2 and 8 provide power to the parameter unit. Do not use these pins for RS-485 communication.
When making RS-485 communication between the FR-
D700 series, FR-E500 series and FR-S500 series, incorrect
connection of pins No.2 and No.8 (parameter unit power
supply) of the above PU connector may result in the
inverter malfunction or failure.
When multiple inverters are connected using pins No.2
and No.8, power is provided from the inverter which is
powered on to the inverters which are powered off in case
inverters which are powered on and off are mixed. In such
case, a protective circuit of the inverter, which is on,
functions to stop communication.
When connecting multiple inverters for RS-485
communication, make sure to disconnect cables from No.2 and No.8 so that pins No.2 and No.8 are not connected
between inverters.
When using the RS-485 converter which receives power from the inverter, make sure that power is provided from one
inverter only. (Refer to the figure below.)
Do not connect the PU connector to the computer's LAN board, FAX modem socket or telephone modular connector.
The product could be damaged due to differences in electrical specifications.
8) 1)to
Inverter
(receptacle side)
viewed from bottom
PU
connector
PU
connector
PU
connector
Inverter Inverter Inverter
Battery supply mode
Protective
circuit
operation
(shut-off)
Communication
stop
When pins No.2 and No.8 are connected
ON OFF OFF
Power supply
Computer
Terminating resisto
r
PU
connector
PU
connector
PU
connector
Inverter Inverter Inverter
Connect pins No.2 and No.8
of one inverter and a converter only.
Do not connect pins No.2 and No.8
of the other inverters.
Station 1 Station 2 Station n
RS-232C RS-485
converter
RS-232C
connector
Distributor
Power supply