Mitsubishi Electric MELSEC Q Series Programming Manual page 505

APPENDICES
Table 1.4 Positioning control start error (100 to 199) list (Continued)
Control mode
Error
code
120
121
122
123
124
Error cause
• ZCT not set
The zero pass signal
(M2406+20n) turned off at
the re-travel at the home
position return for proximity
dog, count and limit switch
combined method or start in
the home position return for
data set method.
• When "Not execute servo
program" is selected in the
operation setting for
incompletion of home
position return, the home
position return request signal
(M2409+20n) turns on.
• Home position return is
started on the direct drive
motor when the absolute
position data of the encoder
has not been established.
• When the home position is
on the proximity dog, the
scale home position signal
detection method home
position return was started
up again, at the home
position return complete
signal ON, after completion
of the home position return. Home
• When using the scale home
position signal detection
method home position return
or the dogless home position
signal reference method
home position return
(operation A), the servo
parameter PC17 is other
than "Need to pass motor Z
phase after the power
supply is switched on".
APP - 14
Error
Corrective action
processing
• Execute the home position
return after the zero point
Home passed.
position
return is not
completed
correctly.
• Execute servo program after
home position return.
• In the system which enables
execution of servo program
even if the home position
return request signal
(M2409+20n) turns on, set
Positioning
"Execute servo program" as
control does
"operation setting for
not start.
incompletion of home position
return".
• Turn the power supplies of the
system or servo amplifier from
OFF to ON after passing the
zero point of the motor by the
JOG operation, etc.
• When the home position is on
the proximity dog, continuous
home position returns of scale
home position signal detection
method are not supported.
• Execute JOG operation or
positioning to return before the
proximity dog ON, and execute
home position return.
position
• Set "Need to pass motor Z
return does
phase after the power supply is
not start. switched on" to the servo
parameter PC17.
When you change the servo
parameter PC17, please once
turn off the power supply of
servo amplifier and turn it on
again.