Troubleshooting - Hitachi SJ700-2 Series Instruction Manual

Chapter 7 Errors and Troubleshooting

7.2 Troubleshooting

The table below shows how to handle the errors specific to the easy sequence function. For how to
handle other errors in the inverter, refer to the SJ700 Series Inverter Instruction Manual.
Factor Error (causing
code inverter trip)
Invalid
E43
instruction
Nesting count
E44
error
Instruction
E45
error 1
*1 For details, refer to the SJ700-2 Series Inverter Instruction Manual.
*2 The settings of some parameters affect inverter output and the functions of input/output terminals.
Changing the settings of said parameters during inverter operation may entail the risk of abnormal
operation of the motor or machine driven by the inverter. If you change the setting of a parameter
after disabling the software lock or switching to the mode enabling parameter updating during inverter
operation, check the influence of the update beforehand to ensure the safety of system operation.
Possible cause
The PRG terminal was
turned on without a program
downloaded to the inverter.
The program stored in
inverter memory has been
destroyed.
Subroutines are nested in
more than eight layers.
for-next loop statements are
nested in more than eight
layers.
if statements are nested in
more than eight layers.
The jump destination of a
goto instruction is a next
instruction to end a for or
other loop.
The variable "U (ii)"
referenced via another
variable is not found.
An arithmetic instruction
caused:
- overflow,
- underflow, or
- division by zero.
A chg param instruction
caused:
- reference to a nonexistent
parameter,
- writing of a value out of the
setting range,
- change of a parameter
value (during inverter
operation) that cannot be
updated during inverter
operation, or
- change of a parameter
value of which updating is
restricted by software lock
(when software lock is
enabled).
Checking method
Upload the program from
the inverter to the personal
computer, and check
whether the uploaded
program matches one of
the programs stored on
the personal computer.
Read the program to
check the number of
nesting layers.
Check whether each goto
instruction jumps to an
instruction that ends a
loop.
Check the numerical value
specified in "U (ii)".
Check the program for the
instruction causing
overflow, underflow, or
division by zero.
- Check the parameters
and the values to be
written.
- If the error has occurred
during inverter
operation, check
whether the parameter
in question is the one
that can be updated
during inverter
operation. (*1)
- Check the setting of
software lock selection
(b031). (*1)
7 - 2
Corrective action
Recreate the program, and
then download it to the
inverter.
Correct the program so that
the number of layers will be
eight or less.
Correct the jump destinations
of goto instructions.
Correct the value of variable
"U (ii)" or limit the range of
values of variable "U (ii)".
Correct the program so that
no arithmetic instruction
causes overflow, underflow, or
division by zero.
- Correct the parameters or
the values to be written to
parameters so that they will
be within the setting range.
- Disable software lock. (*2)
- If the parameter to be
updated is the one that
cannot be updated during
inverter operation, change
the setting of software lock
selection (b031) to "10" to
switch to the mode enabling
parameter updating during
inverter operation. (*2)