Electrical Design
‑51‑
Note
The figure above shows only the AC drive system connection. For details about peripheral
device selection, see "
4.1 List of Options
"
on page 104
.
Table 3–1 Usage of peripheral electrical devices
Device Position
Description
Circuit
breaker
Between the
power supply and
the AC drive input
side
Short circuit breaker: Cuts off power supply when
overcurrent occurs on downstream devices.
Earth leakage circuit breaker: Provides protection
against potential leakage current during AC drive
operation to prevent electric shock and even fire.
Select proper earth leakage circuit breakers as needed.
Fuse
Between the
power supply and
the AC drive input
side
Protects downstream semiconductor components in
case of short circuit.
(Electromag
netic)
contactor
Between the
circuit breaker
and the AC drive
input side
Switches on or off the AC drive. Do not start/stop the
AC drive frequently by switching on or off the contactor
(time interval is at least one hour) or use the contactor
to directly start the AC drive.
Input
reactor
AC drive input
side
Improves the input‑side power factor.
Eliminates high‑order harmonics of the input side
effectively and prevents other devices from being
damaged due to distortion of voltage waveform.
Eliminates input current unbalance due to unbalance
between the power phases.
EMC filter
AC drive input
side
Reduces conducted and radiated interference that
escapes from the AC drive to the outside.
Reduces conducted interference from the power
supply to the AC drive, improving the anti‑interference
capacity of the AC drive.
DC reactor
Standard for
MD580 series AC
drives above
18.5G/22P
Improves the input‑side power factor.
Improves the efficiency and thermal stability of the AC
drive.
Eliminates the impact of input high‑order harmonics
on the AC drive and reduces conducted and radiated
interference to the outside.
Braking
resistor
75G/90P models
and below,
containing letter
B in the
designation
Use a braking resistor for 75G/90P models and below
containing letter B in the designation.
Dissipates regenerative energy during motor
deceleration.
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