TOSHIBA TOSVERT VF-AS3 (03) PDF Document

When using the TOSHIBA TOSVERT VF-AS3, adhere to the following safety precautions:

Prohibited Actions:

Do not connect Ethernet to the RS485 communication connector as this can result in malfunction. Do not connect or disconnect the communication cable when power is ON.

Mandatory Actions:

The number of times of writing a parameter to EEPROM must be 100,000 or less. EEPROM has a life that expires after approximately 100,000 write cycles. Command parameters generally use RAM, so there is no limit to the number of writing times. When the TOSHIBA inverter protocol is used and there is no need to store data, write only to RAM using a P command.

Set the parameter for communication time-out. The devices cannot be stopped when a communication error occurs if this is not configured.

The pin arrangement for the Standard function RS485 communication connector 1 (using a 2-wire RS485 communication port) is as follows:

Supported communication protocols are TOSHIBA inverter protocol and MODBUS-RTU protocol. You can select the protocol using the following parameters. The parameter change is reflected after a reset, such as power-off.

The types of commands for communication in the TOSHIBA inverter protocol are as follows:

The inverter number is set using parameter [F802]. The specified valid range of the inverter number for MODBUS-RTU is 0 to 247. However, you should set a communication number between 1 to 247 because 0 is reserved for broadcast communication (no reply).

Inverter-to-inverter communication allows for speed-proportional control without a PLC. Follow these steps:

1. Wiring:

To use 4-wire RS485 on RS485 communication connector 2, set [F829: RS485 (2) wiring type] to “1: 4-wire”.

2. Protocol Setting:

Set [F807] or [F827] to “0: TOSHIBA” for all inverters (leader and followers). Reset the inverter after changing this setting.

3. Communication Selection:

Set only one inverter on the network as the leader and others as followers using parameter [F806] or [F826].

Setting for the leader inverter:

3: Leader (transmit frequency command)

4: Leader (transmit output frequency signal)

5: Leader (transmit torque command)

6: Leader (transmit output torque command)

Setting for the follower inverters:

0: Follower (0 Hz command when Leader fails)

1: Follower (continue running when Leader fails)

2: Follower (emergency off when Leader fails)

You can use communication command 1 (Communication No. FA00 or FA04). Specifically, Bit 9 controls Fwd/Rev (0: Fwd run, 1: Rev run) and Bit 10 controls Run/Stop (0: Stop, 1: Run).

Example: Forward operation command (PFA008400) CR

Set 1 to BIT15 (communication command enabled) and BIT10 (run command).

Data: 1000 0100 0000 0000 (Binary) = 8400 (Hex)

Example: Reverse operation (PFA008600) CR

Set 1 to BIT15, BIT10, and BIT9.

Data: 1000 0110 0000 0000 (Binary) = 8600 (Hex)

If communication cannot be established, check the following items:

• Have you turned on the computer or inverter?
• Are the cables wired properly? (Check sending/receiving status in “Communication status” of Monitor mode).
• Are the same communication protocol, baud rate, and parity used on a communications line?
• Are the settings of [F809: Operation panel connection priority] and [F829: RS485 (2) wiring type] correct?
• Is the pull-up/pull-down resistor used?
• Is a blank time of 3.5 bytes or more set before and after the reception frames?

• Is the transmission format correct?
• Is the written data out of range?
• While the inverter is running, no data can be written to some parameters. Write data to them when the inverter stops.
• Check if [F700: Parameter reading&writing access lockout] is set to “2: Writing locked (1+RS485)” or “4: Reading&Writing locked (3+RS485)”.
• No data can be written to [F738] when [F738: Password setting] is set.

An [Err5] trip indicates a communication time-out error. Check the wiring and the timer setting time in parameters [F803] or [F823].

• The values of some communication-related parameters take effect after reset. Turn off and then on the inverter.
• When [F897: Parameter writing] is set to “1”, all writing via communication is only done to the RAM. From the operation panel, set [F897] to “0” and turn off the inverter to reset if you want values to persist.
• Some functions cannot be used in the MODBUS-RTU protocol.

The CRC calculation procedure is as follows:

1. Set 16-bit data (FFFFH) in which all the values are “1” to the 16-bit register as a default setting.

2. Obtain the exclusive OR with the 16-bit register for CRC and n-th 1 byte of the message (use only the lower 8 bits and extend the upper 8 bits with 0).

3. Shift the register for CRC toward the least significant bit (LSB) by 1 bit. Then, set zero for the most significant bit (MSB). Extract the least significant bit (LSB) to check.

4. When the least significant bit (LSB) is 0 -> Repeat step 3. When the least significant bit (LSB) is 1 -> Obtain the exclusive OR with the register for CRC and the polynomial value A001H (1010 0000 0000 0001).

5. Repeat 3 and 4 until shift is performed eight times (8 bits).

6. Repeat step 2 – 5 for 8 bits of the next message. Repeat this until all the bytes have been processed.

7. The CRC value is the contents of the register for CRC after applied to all the bytes in the message.

8. When CRC is added to the message, the lower byte is added first, and then the upper byte.