8 Communications Functions
Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
An unsupported function is specified.
The specified address does not exist.
The specified data is in an unacceptable format.
Writing to a holding register is specified, but the data is out of the range allowed for the inverter.
The inverter does not allow this function because:
• Function attempts to change a register that cannot be changed during RUN.
• Function attempts to issue the Enter command during RUN (UV
*1
).
• Function attempts to write data to a register during trip (UV
*1
).
• Function attempts to write data to a register on which the soft lock function is enabled.
• Function attempts to change an I/O terminal that cannot be changed.
• Function attempts to change the contact type of the terminal to which the RS (Reset) is allo-
cated.
• Function attempts to write data to a register when the auto-tuning function is enabled.
• Function attempts to write data to a password-locked register when the password function is
enabled.
etc.
Function attempts to write data to a read-only register (coil).
*1. UV: Undervoltage
8-4-5 No Response
The inverter will ignore the query and return no response if:
•
It receives a broadcast (query with the address set to 0).
•
It detects a communications error in receiving a query.
•
The slave address specified in a query differs from the inverter’s slave address setting.
•
The length of the time interval set for the inverter to receive the next data of the message after
receiving a message is less than 3.5 characters.
•
The data length of a query is inappropriate.
•
The length of the reception interval in a frame exceeds 1.5 characters.
•
The error check code specified in a query does not match (CRC error).
•
It receives a simultaneous broadcast by group (query with the address set to 250 to 254).
•
Provide a timer on the master side for monitoring the response and set it to resend the same query if
no response is received within the set time.
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