Appendix 4 Troubleshooting - Toshiba Tosvert RS485 Instruction Manual

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
Communication will not
place.
An error code is returned.
The trip err5 and alarm t
occur.
Frequency instructions from the
computer have no effect.
Commands, including the run and
stop commands, from the com-
muter have no effect.
During RS485 communication,
an inverter sends back respons-
es repeatedly an infinite number
of times.
A change to a parameter does
not take effect.
The setting of a parameter was
changed, but it returns to its
original setting when the inverter
is turned off.
take - 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?
- 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.
- Check the cable connection and the timer setting.
- Is the frequency setting mode selection parameter set to "computer"?
- Is the command mode selection parameter set to "computer"?
- Is
the inverter connected correctly?
-
Are you sure the receive line and the send line are not in contact with
each other?
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.
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.
Remedies
70
E6581315
Reference
Chapter 7
Section 4.1
Section 5.1
Chapter 9
Inverter
instruction
manual
Section 7.3
Section 8.1
Section 8.1
Refer to
Appendix
2.
Chapter 7
Section 4.2