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13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
(1) Enabling control function of magnetic cont actor (parameter No.PA02 1 (initial value))
Connecting the magnetic contactor control con nector (CNP1) to the operating coil of the magnetic contactor
enables to control the magnetic contactor.
Converter unit
L11
L21
Power supply
MC
NFB
1MC1
2MC2
CNP1
Control circuit
power supply
RA3
RA1 RA2 EM1 OFF/ON
SK
Converter
unit trouble
Servo motor
thermal relay
Operation
-ready
Drive unit
trouble
RA4
Controller
forced stop
Forced stop
MC
L1
L2
L3
(Note)
Note. Stepdown transformer is required when coil voltage of the magnetic contactor is 200V class, and the converter unit and the drive
unit are 400V class.
When the converter unit receives a start command f rom the drive unit while the magnetic contactor control
connector (CNP1) is connected to the magnetic c ontactor (refer to section 13.3.2 (1)), CNP1-2 and L21
conduct in the converter unit. Then the contr ol circuit power is supplied to turn ON the magnetic co ntactor
and the main circuit power is supplied to the converter unit.
Either when an alarm occurs on the converter unit or th e drive unit while the control function of the magnetic
contactor is enabled, or when the forced stop (E M1) of the converter unit or the drive unit is turne d OFF, the
switch between CNP1-2 and L21 in the converter u nit is disconnected and the main circuit power supply is
automatically shut off.
To automatically shut off the main circuit power supply by alarm, enable the control f unction of the magnetic
contactor.
(2) Disabling control function of magnetic contac tor (parameter No.PA02 0)
When not connecting the magnetic contactor control co nnector (CNP1) to the operating coil of the magnetic
contactor, configure the circuit to shut off the main circ uit power supply when detecting an alarm since the
main circuit power supply is not automatical ly shut off even when an alarm occurs on the converter u nit or
the drive unit.