Mitsubishi Electric MELSEC iQ-R RD75P4, User Manual

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14 TROUBLESHOOTING
14.5 List of Error Codes
529
14
1906H Hardware stroke
limit (-) 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. • 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 RD75.
1907H 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 1 sudden stop selection of detailed parameter 2
(deceleration stop/sudden stop). (for manual pulse generator
operation, deceleration stop only) 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.
1908H Stop signal ON
at start The start request has been performed while Stop signal is on.
[Operation of when the error has occurred]
The operation does not start. Correct the timing so that the operation starts after the stop
command is cleared.
1909H The start request has been performed while External stop
signal is on.
[Operation of when the error has occurred]
The operation does not start. Correct the timing so that the operation starts after the
external stop is cleared.
190AH PLC READY
OFF

ON
during BUSY
PLC READY signal [Y0] has been turned on while BUSY
signal [XC, XD, XE, XF] is on.
[Operation of when the error has occurred]
RD75 READY signal [X0] does not turn on. Turn on PLC READY signal [Y0] while BUSY signal [XC, XD,
XE, XF] of all axes are off.
1930H Hold error The parameter "CPU error output mode setting" is set to
"Hold" for the RD75.
[Operation of when the error has occurred]
RD75 READY signal [X0] does not turn on. Set the parameter "CPU error output mode setting" to "Clear".
1931H Flash ROM
write error 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 flash ROM may be at the end of writable life.
1932H Flash ROM sum
check error 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. Return the value of the parameter to the factory default.
1940H Start at OP 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. • Set 1 (Perform the OPR retry with limit switches) in [Pr.48]
OPR retry. For details, refer to  Page 413 [Pr.48] OPR
retry.
• Perform the machine OPR after moving the object from the
current position (OP) with a manual operation.
1941H Dog detection
timing fault 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 3 sudden stop selection of detailed parameter 2
(deceleration stop/sudden stop). • Slow down the OPR speed. For details, refer to

Page
411 [Pr.46] OPR speed.
• Make the input time of Near-point dog signal longer.
1942H Zero signal
detection timing
fault At the machine OPR using the stopper method 2, Zero 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 3 sudden stop selection of detailed parameter 2
(deceleration stop/sudden stop). • Slow down the OPR speed. For details, refer to

Page
411 [Pr.46] OPR speed.
• Input Zero signal while the object is moving at creep speed
when inputting the signal from an external source. For
details, refer to

Page 47 Stopper method 2.
1943H Dwell time fault At the machine OPR using the stopper method 1, the dwell
time has passed 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 3 sudden stop selection of detailed parameter 2
(deceleration stop/sudden stop). • Slow down the OPR speed. For details, refer to  Page
411 [Pr.46] OPR speed.
• Set a greater value in [Pr.49] OPR dwell time. For details,
refer to  Page 414 [Pr.49] OPR dwell time.
Error
code Error name Cause and description Action