Chapter 3 Environment description and installation
3-10
3.3.3Precautions for peripheral applications:
Power supply:
z
Make sure the correct voltage is applied to avoid damaging the
inverter.
z
A molded-case circuit breaker or fused disconnect must be
installed between the AC source and the inverter.
Molded-case circuit breaker:
z
Use a molded-case circuit breaker that conforms to the rated
voltage and current of the inverter to control the power and
protect the inverter.
z
Do not use the circuit breaker as the run/stop switch for the
inverter.
Fuse:
z
A suitable fuse should be installed with inverter rated voltage
and current when a MCCB is not being used.
Earth Leakage circuit breaker:
z
Install a leakage 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:
z
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.
z
Do not use the magnetic contactor as the run/stop switch for the
inverter.
AC Line Reactor for power quality:
z
When inverters are supplied with high capacity (above
600KVA) power source, a AC reactor can be connected to
improve the PF.
Input noise filter:
z
A filter must be installed when there are inductive loads
affecting the inverter.
Inverter:
z
Output terminals T1, T2, and T3 are connected to U, V, and W
terminals of the motor. If the motor is reversed while the inverter
is set to run forward, just swap any two terminals of T1, T2, and
T3.
z
To avoid damaging the inverter, do not connect the input
terminals T1, T2, and T3 to AC input power.
z
Connect the ground terminal properly.( 230 V series: Rg
<100
Ω
; 460 V series: Rg <10
Ω
.)
Figure 3-9 Typical installation
schematic
Power
Molded-case
circuit breaker
Fuse
Leakage breaker
Magnetic
contactor
AC reactor
for power
improvement
Input noise
filter
EV inverter
Earth Ground
Earth Ground
Three-phase
squirrel cage
motor
