5 Troubleshooting
5
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During Startup Fault Symptom
Cause
Confirming Methods
Servo motor
jitters at low
speed.
Motor speed is not
steady.
The gain is set
improperly.
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.
After preceding causes are removed, servo motor can operate normally.
Servo system
runs normally.
Positioning
inaccurate
Unsatisfactory position
deviation is generated.
Confirm input reference pulse counter (H0B-
13), feedback pulse counter (H0B-17) and
mechanical stop position according to the
following steps.
5.1.2 Speed Control
During Startup
Fault Symptom
Cause
Confirming Methods
Connect control
power L1C/L2C
and main power
L1/L2 and R/S/
T.
The LED display is
not on or does not
display "rdy".
1. Control
power voltage is
abnormal.
After disconnecting CN1, CN2, CN3 and CN4, the
fault persists.
Measure AC voltage between L1C and L2C.
2. Main power
voltage is
abnormal.
For single-phase 220 V mode, measure AC voltage
between L1 and L2. When DC bus voltage amplitude
(voltage between
P
and
-
) is lower than 200 V, "nrd"
is displayed.
For three-phase 220/380 V model, measure AC
voltage between R, S and T. When DC bus voltage
amplitude (voltage between
P
and
-
) is lower than
460V, "nrd" is displayed.
3. The program
burning terminal is
shorted.
Check whether the program burning terminal is
shorted.
4. The servo drive
is faulty.
-
The operation
panel displays "Er.
xxx".
Remove the fault.
After the preceding causes are removed, the operation panel should display "rdy".
Summary of Contents for IS650P Series
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