11-17
11-4 Troubleshooting
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Troubleshooting and Maintenance
25 0 Excessive hybrid error
During fully-closed control, the
difference between the position of
load from the external encoder and
the position of the motor due to the
encoder was larger than the number
of pulses set for the Internal/External
Feedback Pulse Error Counter
Overflow Level (Pn328).
· Check the motor and load
connections. Check the external
encoder and drive connection.
· When moving the load, check to
see if the change in the
Servomotor position (total
encoder pulses) has the same
sign as the change in the load
position (total external encoder
feedback pulses). Check to see if
the External Feedback Pulse
Dividing Numerator and
Denominator (Pn324 and Pn325),
and External Feedback Pulse
Direction Switching (Pn326) are
set correctly.
26
0 Overspeed
The Servomotor rotation speed
exceeded the value set for the
Overspeed Detection Level Setting
(Pn513).
· Do not give excessive speed
commands.
· Check the input frequency,
dividing ratio, and multiplication
ratio of the command pulse.
· If overshooting occurred due to
faulty gain adjustment, adjust the
gain.
· Connect the encoder cable
correctly.
1 Overspeed 2
The Servomotor rotation speed
exceeded the value set for the
Overspeed Detection Level Setting at
Immediate Stop (Pn615).
27
0
Command pulse
frequency error
The command pulse input frequency
exceeded 1.2 multiplied by the
Command Pulse Input Maximum
Setting (Pn532).
Check the command pulse input.
2
Command pulse
multiplier error
The command pulse frequency or
electronic gear ratio parameters are
not set correctly. The number of
command pulses per 0.167 ms
multiplied by the electronic gear ratio
exceeded approximately 3 Gpps (or
approx. 175 Kpps for software
versions lower than V1.10). The
command pulse input frequency
varies greatly. Counting errors are
resulting from noise on the command
pulse input.
· Set the electronic gear ratio to the
lower possible value between 1/
1,000 and 1,000.
· Check the command pulse input.
· If possible, use a line driver
interface.
· Set the Command Pulse Input
Maximum Setting (Pn532) to less
than 1,000 to enable a digital filter.
28 0
Pulse regeneration
error
The pulse regeneration output
frequency exceeded the limit.
· Check the set values of the
Encoder Dividing Numerator
(Pn011) and Encoder Dividing
Denominator (Pn503).
· To disable detection, set the Pulse
Regeneration Output Limit Setting
(Pn533) to 0.
Alarm
number
Name Cause Measures
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