Communication Operation And Setting; Wiring And Configuration Of Pu Connector - Mitsubishi Electric FR-D720-0.4K Instruction Manual

4.19 Communication operation and setting

Purpose
Communication operation from PU
connector
Restrictions on parameter write
through communication

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
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, is activated to stop communication.
When connecting
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.
Initial setting of computer link
communication (PU connector)
Modbus-RTU communication
specifications
Communication EEPROM write
selection
Inverter
(receptacle side)
viewed from bottom
8) to 1)
multiple inverters for
Computer
Station 1
RS-232C
Inverter
connector
PU
connector
RS-232C RS-485
converter
Distributor
Connect pins No.2 and No.8
of one inverter and a converter only.
Power supply

Communication operation and setting

Parameter that should be Set
Pr. 117 to Pr. 124
Pr. 117, Pr. 118, Pr. 120,
Pr. 122, Pr. 343, Pr. 502,
Pin Number Name
1) SG
2) —
3) RDA
4) SDB
5) SDA
6) RDB
7) SG
8) —
When pins No.2 and No.8 are connected
Protective
ON
circuit
Inverter
operation
PU
(shut-off)
connector
RS-485
Communication
stop
Station 2 Station n
Inverter Inverter
PU PU
connector connector
Terminating resistor
Do not connect pins No.2 and No.8
of the other inverters.
Refer to Page
182
199
Pr. 549
Pr. 342
186
Description
Earth (ground)
(connected to terminal 5)
Parameter unit power supply
Inverter receive+
Inverter send-
Inverter send+
Inverter receive-
Earth (ground)
(connected to terminal 5)
Parameter unit power supply
OFF OFF
Inverter Inverter
PU PU
connector connector
Power supply
4
179