-332-
9 Troubleshooting
Root Cause
Confirming Method
Solution
3. The setting of 2002-
1Ah is incorrect when
an external regenerative
resistor is used.
View the set value of 2002-1Ah.
Measure the resistance of the external
regenerative resistor connected between
P and C. Check whether the resistance
is too large by comparing it with value
listed in
regenerative resistor for SV660N series
servo drive"
Check whether the value of 2002-1Ch is
larger than the resistance of the external
regenerative resistor connected between P
and C.
Set 2002-1Ah to a proper value according
to
"5.4.3 Regenerative Resistor Settings"
:
2002-1Ah = 1 (External, naturally
ventilated)
2002-1Ah = 2 (External, forcible cooling)
4. The resistance of the
external regenerative
resistor used is too large.
Select a proper regenerative resistor
according to Table 5-3.
5. The value of 2002-1Ch
(Resistance of external
regenerative resistor)
is larger than the
resistance of the external
regenerative resistor
actually used.
Set 2002-1Ch according to the resistance
of the external regenerative resistor
actually used.
6. The input voltage of
the main circuit exceeds
the specification.
Check whether the input voltage of the
main circuit on servo drive side complies
with the following specifications:
◆
220 V servo drive:
Effective value: 220 V to 240 V
Allowable deviation: –10% to +10%
(198 V to 264 V)
◆
380 V servo drive:
Effective value: 380 V to 440 V
Allowable deviation: –10% to +10%
(342 V to 484 V)
Replace the power supply or adjust
the power voltage according to the
specification.
7. The load inertia ratio
is too large.
Perform inertia auto-tuning according to
, or calculate
the total mechanical inertia according to
mechanical parameters.
Check whether the actual load inertia
ratio exceeds 30.
Select an external regenerative resistor of
large capacity and set 2002-1Bh (Power of
external regenerative resistor) according
to the actual value.
Select a servo drive of large capacity.
Reduce the load if allowed.
Increase the acceleration/deceleration
time if allowed.
Increase the motor running cycle if
allowed.
8. The motor speed
is too high, and
deceleration is not
completed within the
required time. The
motor is in continuous
deceleration status
during cyclic motion.
View the motor speed curve during cyclic
motion and check whether the motor is in
the deceleration status for a long time.
9. The capacity of
the servo drive or
regenerative resistor is
insufficient.
View the single-cycle speed curve
of the motor and calculate whether
the maximum braking energy can be
absorbed completely.
10. The servo drive is
faulty.
-
Replace the servo drive.
■
E922.0: Resistance of the external regenerative resistor too small
Direct cause:
The value of 2002-1Ch (Resistance of external regenerative resistor) is smaller than the value of 2002-16h
(Minimum permissible resistance of regenerative resistor).
