N3 Drive Operations Manual
Peripheral Power Devices
17
11.0 Peripheral Power Devices
The following describes some of the precautions that should be followed when selecting peripheral power devices.
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~
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Power Supply
MCC
B
Molded
Circuit
Breaker
Magnetic
Contactor
AC
Reactor
Fast
Acting
Fuse
Input Noise
Filter
N3
Inverter
Ground
Induction
Motor
Ground
Output Noise
Filter
Power supply:
!
Make sure the correct voltage is applied to avoid damaging the
inverter.
Molded-case circuit breaker (MCCB) or fused disconnect:
A molded-case circuit breaker or fused disconnect must be installed
between the AC source and the inverter that conforms to the rated
voltage and current of the inverter to control the power and protect the
inverter.
!
Do not use the circuit breaker as the run/stop switch for the
inverter.
Ground fault detector / breaker:
!
Install a ground fault breaker to prevent problems caused by
current leakage and to protect personnel. Select current range up to
200mA, and action time up to 0.1 second to prevent high frequency
failure.
Magnetic contactor:
Normal operations do not need a magnetic contactor. When
performing functions such as external control and auto restart after
power failure, or when using a brake controller, install a magnetic
contactor.
!
Do not use the magnetic contactor as the run/stop switch for
the inverter.
AC line reactor for power quality:
When inverters are supplied by a high capacity (above 600KVA)
power source, an AC reactor can be connected to improve the power
factor.
Install Fast Acting Fuse:
To protect peripheral equipment, install fast acting fuses in
accordance with the specifications in
Sec.12.0
.
Input and output noise filter:
A filter must be installed when there are inductive loads affecting the
inverter.
Inverter:
Output terminals T1, T2, and T3 are connected to U, V, and W
terminals of the motor. If the motor runs in reverse while the inverter
is set to run forward, swap any two terminals connections for T1, T2,
and T3.
!
To avoid damaging the inverter, do not connect the output
terminals T1, T2, and T3 to AC input power.
!
Connect the ground terminal properly. (230V series: Rg <100
;
460V series: Rg <10
.)
