
5
VFD-S Series
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5-47
9 - 03 Modbus Communication Watchdog Timer Factory Setting: d 0
Settings d0 Disable Unit: 1 sec
d1 1 sec to d20 20 sec
This parameter can be set during operation.
If the Watchdog timer function is enabled, the timer will start counting once the first valid
Modbus communication signal is received after power-up or reset. The timer will reset
to 0 after each valid Modbus communication message is received. If the watchdog timer
reaches the value set in Pr. 9-03, the drive will stop its output and display the message
"CE10" on the digital keypad. This fault can reset by an external terminal, keypad or a
Modbus communication reset command.
9 – 04 Communication Protocol Factory Setting: d 0
Settings d 0 Modbus ASCII mode, protocol <7,N,2>
d 1 Modbus ASCII mode, protocol <7,E,1>
d 2 Modbus ASCII mode, protocol <7,O,1>
d 3 Modbus ASCII mode, protocol <8,N,2>
d 4 Modbus ASCII mode, protocol <8,E,1>
d 5 Modbus ASCII mode, protocol <8,O,1>
d 6 Modbus RTU mode, protocol <8,N,2>
d 7 Modbus RTU mode, protocol <8,E,1>
d 8 Modbus RTU mode, protocol <8,O,1>
This parameter can be set during operation.
1.Computer Control
6
1
1: +EV
2: GND
3: SG-
4: SG+
There is a built-in RS-485 serial interface, marked (RJ-11 Jack) on the control
terminal block, for VFD-S Series. The pins are defined above.
Each VFD-S AC drive has a pre-assigned communication address specified by Pr.
(9-00). The computer then controls each AC drive according to its communication
address.
VFD-S can be setup to communicate on Modbus networks using one of the
following modes: ASCII (American Standard Code for Information Interchange) or
RTU (Remote Terminal Unit). Users can select the desired mode along with the
serial port communication protocol in Pr. 9-04.
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