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13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
2) Drive unit
When an alarm occurs on the drive unit, the base c ircuit is shut off and the servo motor coasts. W hen
using a dynamic brake (option), the dynamic brak e is activated to stop the servo motor. To de activate
the alarm, power the control circuit off, then on, t urn the reset (RES) on or CPU reset command.
However, the alarm cannot be deactivated unless its cause is removed .
50ms or more
Converter unit control
power supply
Drive unit control
power supply
Main circuit
power supply
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Servo-on command
(from controller)
Drive unit alarm
Reset command
(from controller)
Base circuit
OFFONOFF
1.5s
Converter unit alarm
(3s) (3s)
Alarm occurrence
OFF
a) a)
a) in Figure After completing to start the drive unit, the m ain circuit power is supplied while the
drive unit and the converter unit have no alarms.