3.4 - SERVO CONTROLLER
Schematics & Parts mySelective.com
CHAPTER 3 9
A.40 Main circuit DC voltage is excessively
high *
³
Power supply voltage is not within the
range of specifications
Check power supply
Load exceeds capacity of the regenerative
unit
Check specifications of load inertia and
overhanging load
Malfunctioning regenerative transistor Replace servopack
Defective rectifying diode
Defective servopack
A.41 Main circuit DC voltage is excessively
low *
³
The power supply voltage exceeds
specified range
Check power supply voltage
Fuse blown Replace servopack
Defective rectifying diode
Defective servopack
A.51 Rotational speed of the motor is
excessively high
Incorrect servomotor wiring Check and correct wiring. (Check for U-,
V-, and W-phase wiring errors)
Position or speed reference input is too
large
Lower the reference input values
Incorrect reference input gain settings Check and correct parameter settings
Defective circuit board (1PWB) Replace servopack
A.71
A.72
The motor was operating for several
seconds to several tens of seconds under
a torque largely exceeding ratings
The motor was operating continuously
under a torque largely exceeding ratings
Incorrect or disconnected servomotor
wiring
Check wiring and connectors at the
servomotor
Load greatly exceeds rated torque Reduce load torque and inertia.
Otherwise, replace with a larger capacity
servomotor
Defective circuit board (1PWB) Replace servopack
A.73 When the dynamic brake was applied,
rotational energy exceeded the capacity
of dynamic brake resistor
The product of the square of rotational
motor speed, the combined inertia of the
motor, and load (rotation energy)
exceeds the capacity of the dynamic
brake resistor built into servo pack
• Reduce the rotational speed.
• Decrease the load inertia.
• Minimize use of the dynamic brake
Defective circuit board (1PWB) Replace servopack
A.74 The main circuit power was frequently
turned ON and OFF
Frequently turning the main circuit power
ON/OFF
Do not repeatedly turn ON/OFF the
main circuit power
Defective circuit board (1PWB) Replace servopack
A.7A
The heat sink of servopack overheated *¹
The ambient temperature of the
servopack exceeds 55°C
Alter conditions so that the ambient
temperature goes below 55°C
Inadequate air flow around the heat sink Provide sufficient space as specified
Fan stopped Replace servopack
Servopack is operating under overload Reduce load
Defective servopack Replace servopack
ALARM DESCRIPTION CAUSE REMEDY
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