Mitsubishi Inverter

117 N020 PU Communication Station

Range: 00 to 31
Specify the inverter station number.
Enter the inverter station numbers when two or more inverters are connected to one personal computer.

118 N021 PU Communication Speed

Options: 192, 48, 96, 192, 384, 576, 768, 1152
Select the communication speed.
The setting value × 100 equals the communication speed.
For example, enter 192 to set the communication speed of 19200 bps.

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119 PU Communication Stop Bit Length / Data Length

Stop Bit Length

• 0 → 1 bit
• 1 → 2 bits

Data Length

• 10 → 7 bits
• 11 → 8 bits

Parity Check

• 0 → Without parity check
• 1 → With parity check at odd numbers
• 2 → With parity check at even numbers

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120 N024 PU Connector Communication

• 0 → PU connector communication is disabled

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122 N026 PU Communication Check Time Interval

Range: 0.1 to 999.8 s
Set the interval for the communication check (signal loss detection) time.
If a no-communication state persists for longer than the permissible time, the inverter output will be shut off.

• 9999 → No communication check (signal loss detection)

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343 N080 Communication Error Count

Displays the communication error count during MODBUS RTU communication. (Read-only.)

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549 N000 Protocol Selection

• 0 → Mitsubishi inverter protocol (computer link)
• 1 → MODBUS RTU protocol

Communication Specifications

• The communication specifications are given below.

Item	Description	Related Parameter
Communication protocol	MODBUS RTU protocol	Pr.549
Conforming standard	EIA-485 (RS-485)	—
Number of connectable units	1: N (maximum 32 units), setting is 0 to 247 stations	Pr.117
Communication speed	Selected among 300/600/1200/2400/4800/9600/19200/38400/57600/76800/115200 bps	Pr.118
Control procedure	Asynchronous method	—
Communication method	Half-duplex system	—
Communication specifications
Character system	Binary (fixed at 8 bits)	—
Start bit	1 bit	—
Stop bit length	Select from the following three types:	Pr.120
	- No parity check, stop bit length 2 bits
	- Odd parity check, stop bit length 1 bit
	- Even parity check, stop bit length 1 bit
Parity check	CRC code check	—
Error check	CRC code check	—
Terminator	Not available	—
Time delay setting	Not available	—

Message frames comprise four message fields shown above.
A slave recognizes message data as one message when a 3.5 character long no-data time (T1: start/end) is added before and after the data.

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Message Frame Structure

Start	Address	Function	Data	CRC Check	End
T1	8 bits	8 bits	n × 8 bits	L 8 bits, H 8 bits	T1

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Message Field Descriptions

Address Field

• "0 to 247" can be set in the 8-bit length field.
• Set "0" for broadcast messages (instructions to all addresses).
• "1 to 247" for individual slave messages.
• The slave response also contains the address set by the master.
• The value set in Pr.117 PU communication station number is the slave address.

Function Field

• "1 to 255" can be set as the function code (8-bit).
• The master sets the function to be sent to the slave, and the slave performs the requested operation.
• An error response is generated if an unsupported function code is used.
• The normal response contains the function code set by the master.
• Error response contains H80 + function code.

Data Field

• The format varies depending on the function code.
• Example: Byte count, number of bytes, accessing content of holding registers.

CRC Check Field

• Detects errors in the received message frame.
• Errors are detected in the CRC check, and the 2 bytes of CRC data are appended to the message.
• Order: Lower byte first, then upper byte.
• Process:
  • The sender calculates and appends the CRC.
  • The receiver recalculates the CRC while receiving the message.
  • If the calculated CRC and received CRC do not match, an error is returned.

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Inverter settings

Motor Constants

The following is a table that shows which Registers need to be set on the Inverter for the safe operation of the Motor.

Parameter number (Pr)	Name	Value
71	Applied Motor	0
80	Motor Capacity	15 (1.5 kw)
96	Auto tuning setting/status	1
1	Max Frequency	5000
2	Min Frequency	0
9	Electronic Thermal O/L Relay	3.30 (Ampere)
3	Base frequency	5000 (50 Hz)
19	Base frequency voltage	400 (Volt)

All Settings needed for the Inverter Communication/Operation with Extruder

The Following settings are required to get the inverter Communication and Operation working properly

Parameter Number (Pr)	Value	Description
Pr. 78	0	Allows Reverse Rotation
Pr. 79	0	Operation Mode Selection
Pr. 117	1	Station Number (Slave Number)
Pr. 118	192	Baudrate (192 → 19200 bps)
Pr. 119	0	Stop Bit Length
Pr. 120	2	Parity Check
Pr. 121	9999	PU communication retry count
Pr. 122	1.0	Communication Check Time (Time until no communication causes E.PUE fault), 0.1 seconds steps
Pr. 338	0	Communication operation command source, 0 -> given through PU
Pr. 339	0	Communication speed command source, 0 -> given through PU
Pr. 340	1	Startup in Network Mode
Pr. 549	1	Protocol Selection (1 = Modbus)
Pr. 551	9999	Automatically Detect PU Connector