Mitsubishi Electric MELSEC iQ-F Series FX5 User Manual page 516

Error code Error name
1904H Hardware stroke
limit (+)
1905H Hardware stroke
limit (+)
1906H Hardware stroke
limit (-)
1907H Hardware stroke
limit (-)
1908H Stop signal ON at
start
1909H Stop signal ON at
start
190AH PLC READY OFF
→ ON during BUSY
1930H Hold error
1931H Flash ROM write
error
1932H Flash ROM sum
check error
■Error at OPR or absolute position restoration
1940H Start at OP
1941H Dog detection
timing fault
19 TROUBLESHOOTING
514
19.5 List of Error Codes
Cause and description
The start request has been performed while Upper limit
signal (FLS) is off.
[Operation of when the error has occurred]
The operation does not start.
Upper limit signal (FLS) has been turned off during
operation.
[Operation of when the error has occurred]
The operation stops according to the setting of [Pr.37]
Stop group 2 sudden stop selection of detailed parameter
1 (deceleration stop/sudden stop). (for manual pulse
generator operation, deceleration stop only)
The start request has been performed while Lower limit
signal (RLS) is off.
[Operation of when the error has occurred]
The operation does not start.
Lower limit signal (RLS) has been turned off during
operation.
[Operation of when the error has occurred]
The operation stops according to the setting of [Pr.37]
Stop group 2 sudden stop selection of detailed parameter
1 (deceleration stop/sudden stop). (for manual pulse
generator operation, deceleration stop only)
The start request has been performed while Stop signal
is on.
[Operation of when the error has occurred]
The operation does not start.
The start request has been performed while External
stop signal is on.
[Operation of when the error has occurred]
The operation does not start.
The [Cd.190] PLC READY signal turned on while the
[Md.141] BUSY signal was on.
[Operation of when the error has occurred]
Check that READY signal ([Md.140] Module status: b0)
does not turn on.
The parameter "CPU error output mode setting" is set to
"Hold" for the positioning module.
[Operation of when the error has occurred]
Check that READY signal ([Md.140] Module status: b0)
does not turn on.
Data cannot be written to the flash ROM.
[Operation of when the error has occurred]
Data cannot be written to the flash ROM correctly.
The system has been powered off while data is being
written to the flash ROM.
[Operation of when the error has occurred]
Data cannot be written to the flash ROM correctly.
When [Pr.48] OPR retry is set to 0 (Do not perform OPR
retry by limit switch), the machine OPR has been
performed using the near-point dog method with OPR
complete flag being on.
[Operation of when the error has occurred]
The machine OPR is not started.
At the machine OPR using the near-point dog method,
Near-point dog signal has turned off while the speed is
decelerating from OPR speed to creep speed.
[Operation of when the error has occurred]
The operation stops according to the setting of [Pr.39]
Stop group 2 sudden stop selection of detailed parameter
3 (deceleration stop/sudden stop).
Action
• Check the wiring of Upper limit signal (FLS).
• Check that the specifications of the limit switch match
the setting of [Pr.22] Input signal logic selection.
• For the system that does not require the limit switch
installation, wire it so that the input of Upper limit signal
(FLS) is always on in the positioning module.
After performing the axis error reset, move the object with
a manual operation to the position where Upper limit
signal (FLS) is not turned off.
• Check the wiring of Lower limit signal (RLS).
• Check that the specifications of the limit switch match
the setting of [Pr.22] Input signal logic selection.
• For the system that does not require the limit switch
installation, wire it so that the input of Lower limit signal
(RLS) is always on in the positioning module.
After performing the axis error reset, move the object with
a manual operation to the position where Lower limit
signal (RLS) is not turned off.
Correct the timing so that the operation starts after the
stop command is cleared.
Correct the timing so that the operation starts after the
external stop is cleared.
Turn on the [Cd.190] PLC READY signal when the
[Md.141] BUSY signal is off.
Set the parameter "CPU error output mode setting" to
"Clear".
The flash ROM may be at the end of writable life. Set the
extended parameter storage setting to "CPU", or replace
the module with another one.
Return the value of the parameter to the factory default.
• Set 1 (Perform the OPR retry with limit switches) in
[Pr.48] OPR retry. For details, refer toPage 404
[Pr.48] OPR retry.
• Perform the machine OPR after moving the object from
the current position (OP) with a manual operation.
• Slow down the OPR speed. For details, refer
toPage 402 [Pr.46] OPR speed.
• Make the input time of Near-point dog signal longer.