5 Troubleshooting
5
- 38 -
During Startup Fault Symptom Cause Conrming Methods
Input speed
reference
Servo motor
rotates in reverse
direction.
Speed reference
(H0B-01) is
negative.
1. When AI is selected to input speed reference, check
whether polarity of input signal is reverse.
2. When digital setting is used to set speed reference,
check whether H06-03 (keypad setting value of speed
reference) is smaller than 0.
3. When multi-speed is used to set speed reference,
check whether speed references in group H12 are
positive or negative.
4. When serial comms. is used to set speed reference,
check whether H31-09 (speed reference set via
communication) is smaller than 0.
When jog speed reference is used to set speed
reference, check value of H06-04 (jog speed setting
value). Then check whether effective logic of DI
functions FunIN.18: JOGCMD+ (forward jog) and
FunIN.19: JOGCMD- (reverse jog) matches the
predicted rotating direction.
Check whether DI function FunIN.26: SpdDirSel
(speed reference direction) has been allocated and
whether logic of corresponding DI is valid.
Check whether H02-02 (rotation direction selection) is
set correctly.
Servo motor can rotate after preceding fault is removed.
Servo motor
jitters at low
speed.
Motor speed is not
steady.
The gain is set
unreasonably.
Perform automatic gain tuning.
Motor shaft
vibrates left and
right.
The load inertia
ratio (H08-15) is
too large.
If servo motor can run safely, perform inertia auto-
tuning and perform automatic gain tuning.
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