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Appendix 4 Troubleshooting
If a problem arises, diagnose it in accordance with the following table before making a service call. If
the problem cannot be solved by any remedy described in the table or if no remedy to the problem is
specified in the table, contact your Toshiba dealer.
Problem Remedies Reference
Communication will not take
place.
- Are both the computer and the inverter turned on?
- Are all cables connected correctly and securely?
- Are the same baud rate, parity and bit length set for every unit on the
network?
Chapter 7
An error code is returned.
- Is the data transmission format correct?
- Does the data written fall within the specified range?
- Some parameters cannot be written during inverter operation.
Changing should be attempted when the inverter is in halt.
Section 4.1
Section 5.1
Chapter 9
Inverter
instruction
manual
The trip err5 and alarm t
occur.
- Check the cable connection and the timer setting. Section 7.3
Frequency instructions from the
computer have no effect.
- Is the frequency setting mode selection parameter set to “computer”? Section 8.1
Commands, including the run and
stop commands, from the com-
muter have no effect.
- Is the command mode selection parameter set to “computer”? Section 8.1
During RS485 communication,
an inverter sends back respons-
es repeatedly an infinite number
of times.
-Is the inverter connected correctly?
- Are you sure the receive line and the send line are not in contact with
each other?
Refer to
Appendix
2.
A change to a parameter does
not take effect.
Some communication-related parameters do not take effect until the
inverter is reset. To make them take effect, turn the inverter off tempo-
rarily, then turn it back on.
Chapter 7
The setting of a parameter was
changed, but it returns to its
original setting when the inverter
is turned off.
When using the TOSHIBA Inverter Protocol, use the W command to
write data into the EEPROM. If you use the P command that writes data
into the RAM only, the data will be cleared when the inverters are reset.
Section 4.2
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