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15. SERVO AMPLIFIERS WITH A LARGE CAPACITY
(
30k TO 55kW
)
(b) When controlling magnetic contactor by external sequence
1) Converter unit
When an alarm occurs on the converter unit, the servo-on turns OFF; however, the main circuit power
supply is not shut off. Therefore, shut off the main circuit power supply by the external sequence.
After cancelling the alarm on the converter unit (when an alarm is also occurring on the drive unit
after cancelling the alarm on the drive unit as well), turning ON the reset (RES) enables to operate
again.
OFFONOFF
1.5s
50ms or longer
OFFOFF ON OFF
(3s)
Alarm occurrence
ON
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 (SON)
Drive unit alarm
Drive unit reset
(RES)
Base circuit
Converter unit alarm
a) b)
d)
c) f)e)
a) b)
Alarm occurrence
a) in Figure
b) in Figure
c) in Figure
d) in Figure
e) in Figure
f) in Figure
If an alarm occurs on the converter unit, shut off the main circuit power supply by
the external sequence.
Turn on the main circuit power supply while alarms on the drive unit are
deactivated.
Even if an alarm occurs in the converter when the drive unit is at servo off, the
drive unit does not detect the alarm.
To deactivate the alarm of the converter unit, turn the power of the converter unit
off, and then on. (Refer to section 15.6.1.)
If an alarm occurs in the converter unit when the drive unit is at servo on, the
alarm also occurs in the drive unit and the drive unit becomes servo off.
When alarms are occurring on both the converter unit and the drive unit, by
deactivating the alarm on the drive unit, the alarm on the converter unit can be
deactivated.