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13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
(2) Alarm occurrence timing chart
CAUTION
When an alarm has occurred, remove its cause, make sure that the operation
signal is not being input, ensure safety, and reset the alarm before restarting
operation.
As soon as an alarm occurs, make the Servo off status and interrupt the main
circuit power.
(a) When control function of magnetic contactor is enabled
1) Converter unit
When an alarm occurs in the converter unit, the magnetic contactor is turned off and the main circuit
magnetic contactor is shut off. The drive unit in operation stops. To deactivate the alarm, turn the
control circuit power off, then on or request the operation from the driver unit. However, the alarm
cannot be deactivated unless its cause is removed.
b)
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
50ms or more
Converter unit alarm
OFFOFF
ON OFF
(3s) (3s)
a) d)
Alarm occurrence
ON
Alarm occurrence
c)
a) in Figure
b) c) in Figure
d) in Figure
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 (b)) or make the drive unit servo on (c)). (Refer to section 13.6.1.)
If an alarm occurs in the converter when the drive unit is at servo on, the alarm
also occurs in the drive unit and the drive unit becomes servo off.