3-11
Servo Driver Overheating
An alarm will go off if the internal temperature (i.e., heat sink temperature) of the Servo Driver exceeds
90°C.
Alarm Indication
U Series: A. 10
H Series: E21
M Series: A. L-8, A. L-9
R Series: OH
Probable cause Item to check Countermeasure
The ambient temperature is high. • The ambient temperature for the
Servo Driver is higher than 55°C.
• Decrease the ambient tempera-
ture with a cooling fan or cooling
unit.
• Locate the Servo Driver in a
place where the ambient temper-
ature is low enough.
The regeneration is excessive.
(Applicable to M and R Series
only.)
• The regeneration is beyond the
processing capability of a single
Servo Driver.
* Check the regeneration from
the voltage waveform obtained
from the terminals of the
regeneration resistor. Refer to
Main Circuit Overvoltage on
page 3-4.
• Connect the External Regenera-
tion Resistor.
Insufficient rotation of cooling fan
or clogged filter.
(Application to M Series only )
• The fan is not rotating.
* Check the fan visually.
• Replace the Servo Driver.
• Replace the fan.
pp
ca
on
o
er
es on
y.
• The filter is clogged with dirt. • Clean the filter.
The load is too heavy. • The Servo Driver is in continu-
ous operation with its output cur-
rent exceeding the rated current.
(Use the current monitor or indi-
cator.)
• Reduce the load.
• Increase the acceleration/decel-
eration time.
• Increase the motor capacity.
Servo Driver Errors Chapter 3
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