15 - 5
MELSEC-Q
15 TROUBLESHOOTING
(c) When a motor does not rotate at the set speed
Check item Action
[When "
Md.28
Axis feedrate" indicates the set speed]
• Check that the values in "
Pr.2
No. of pulses per
rotation", "
Pr.3
Movement amount per rotation", and
"
Pr.4
Unit magnification" meet the system.
• When the drive unit has the electronic gear function,
check that the settings meet the system.
Does the value in "
Md.28
Axis feedrate" indicate the set
speed?
[When "
Md.28
Axis feedrate" does not indicate the set
speed]
• Check that the speed is not limited by the value in
"
Pr.8
Speed limit value".
• In the JOG operation, Check that the speed is not
limited by the value in "
Pr.31
JOG speed limit value".
• In the JOG operation, check that Forward/Reverse run
JOG start signals (Y8 to YF) do not repeatedly turn ON
and OFF.
(d) When the set position is not reached
Check item Action
[When "
Md.20
Current feed value" reaches the set
position]
• Check that the values in "
Pr.2
No. of pulses per
rotation", "
Pr.3
Movement amount per rotation", and
"
Pr.4
Unit magnification" meet the system.
• When the drive unit has the electronic gear function,
check that the settings meet the system.
Does the value in "
Md.20
Current feed value" indicate
the intended position when
the motor stops?
[When "
Md.20
Current feed value" does not reaches
the set position]
• Check that the motor is not stopped by Axis stop signals
(Y4 to Y7) or a stop signal (STOP). If a motor is stopped
by them, the value "1: Stopped" is stored in "
Md.26
Axis operation status".
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