Mitsubishi Electric FATEC FR-A800 Manual page 129

7
REVIEW OF INSTALLATION ENVIRONMENT
Failure example 1: Wiring for the power supply
[Failure]
Nothing was displayed on the monitor (LED display) when power of the inverter was turned
on.
[Cause]
The commercial power supply inputs R/L1, S/L2, and T/L3 were connected to the output
terminals of the inverter U, V, and W. The display of the power supply itself was incorrect.
7.3 Problems and measures when using inverter
124
Three-phase AC power supply
It must be within the permissible
power supply specifications of the
inverter.
Molded case circuit breaker
(MCCB), earth leakage circuit
breaker (ELB), or fuse
Select the breaker carefully since an
inrush current flows in the inverter at
power ON.
Magnetic contactor (MC)
Install the magnetic contactor to
ensure safety.
Do not use this magnetic contactor to
start and stop the inverter. Doing so
will shorten the life of the inverter.
Reactor (FR-HAL or FR-HEL, option)
A reactor (option) is required to
suppress harmonics, to improve the
power factor, and to install the inverter
near a large power supply system (1000
kVA or more). The inverter may be
damaged if a reactor is not used. Select
a reactor according to the model. When
using the DC reactor with the 55K or
lower, remove the jumper across
terminals P and P-P1 before connecting
the DC reactor to the inverter.
AC reactor
(FR-HAL)
Noise filter
(FR-BLF)
The 55K or lower is equipped
with the common mode choke.
R/L1, S/L2, and T/L3 were mistaken for U, V,
and W, and they were connected to
the output terminals of the inverter.
The inverter was damaged at power ON.
IM connection PM connection
U V W
R/L1 S/L2 T/L3
Earth
(ground)
Induction
Earth
motor
(ground)
U V W
Noise filter (FR-BSF01 or FR-BLF)
Install a noise filter to reduce the
electromagnetic noise generated from
the inverter. The noise filter is effective
in the range from approximately 0.5
MHz to 5 MHz.
Wind the cable within three times (four
turns) to one noise filter.
Contactor
Example) No-fuse switch (DSN type)
Connect it when a PM motor is driven
by the load even while the inverter
power is OFF. Do not open or close
the contactor while the inverter is
running (outputting).
IPM motor (MM-CF)
Use the specified motor. An IPM
motor cannot be driven by the
commercial power supply. When
using a PM motor other than
MM-CF, contact your sales
representative.
Earth
(ground)