Mitsubishi Electric FR-A720-0.4K Instruction Manual page 329

7) Error Code
If any error is found in the data received by the inverter, its definition is sent back to the computer together with the
NAK code.
Error
Error Item
Code
H0 Computer NAK error
H1 Parity error
H2 Sum check error
H3 Protocol error
H4 Framing error
H5 Overrun error

H6
H7 Character error

H8

H9
HA Mode error
HB Instruction code error The specified command does not exist.
HC Data range error

HD

HE

HF
(5) Response time
Computer
Inverter
Inverter
Computer
[Formula for data sending time]
1
×
Communication
speed (bps)
Communication specifications
Name
Stop bit length
Data length
Parity check
In addition to the above, 1 start bit is necessary.
Minimum number of total bits....... 9 bits
Miximum number of total bits....... 12 bits
The number of errors consecutively detected in communication
request data from the computer is greater than allowed number of
retries.
The parity check result does not match the specified parity.
The sum check code in the computer does not match that of the
data received by the inverter.
The data received by the inverter has a grammatical mistake.
Alternatively, data receive
predetermined time. CR or LF is not as set in the parameter.
The stop bit length differs from the initial setting.
New data has been sent by the computer before the inverter
completes receiving the preceding data.
The character received is invalid (other than 0 to 9, A to F, control
code).
Parameter write was attempted in other than the computer link
operation mode, when operation command source is not selected
or during inverter operation.
Invalid data has been specified for parameter write, frequency
setting, etc.
Data sending time (refer to the following formula)
Inverter data processing time
10ms or more necessary
Data sending time (refer to the following formula)
Number of data Communication specifications
×
characters (total number of bits) = Data send time (s)
(Refer to page 317) (See below.)
Number of
Bits
1 bit
2 bits
7 bits
8 bits
Yes 1 bit
No 0
Communication operation and setting
Error Description
is not completed






Waiting time Data check time
(setting 10ms) (depends on the
instruction code (see the
following table))
Time
Data check time
Item
Various monitors, run command,
frequency setting (RAM)
Parameter read/write, frequency setting
(EEPROM)
Parameter clear/all clear
Reset command
Inverter Operation
Brought to an alarm
stop if error occurs
continuously more than
the allowable number of
within the
retries. (E.PUE/E.SER)

Does not accept
received data but is not
brought to alarm stop.


Does not accept
received data but is not
brought to alarm stop.



Check Time
< 12ms
< 30ms
< 5s
No answer
4
319