: Energy flow
at motoring
: Energy flow at
regenerating
R,S,T
U,V,W
PP
NN
VS-656DC5
Power
supply
Inverter drive
IM
The power-factor 1.0 control
*
and the sine-wave PWM control for the
power supply eliminate power losses so that only a power supply with a
capacity equivalent to the load power is required. So, the equipment
required for the power supply including cables and powered devices can
be minimized, which greatly reduces the plant and equipment costs.
*
Power-factor 1.0 control: Controls output voltage and current so that they have the same
phase angle (power factor 1.0).
No protective measures against harmonics are needed, but protective measures
against EMC (radio noise) and high-frequency (harmonic) leaking currents are
required on the same level as that for inverter drives.
80% distortion ratio at rated current 5% distortion ratio at rated current
Lowers cost of power supply equipment.
The optimized layout of components and design for discharging heat
makes the VS-656DC5 compact and lightweight. Also, the fuses for the
power supply voltage detection terminal and the control power supply
(FAN), which are mounted on the outside of the conventional VS-
656DC3, are built into the VS-656DC5 unit.
Because of such features, the VS-656DC5 requires less wiring and less
installation space.
Enables system construction in limited space.
Protects against harmonics from power supply devices.
Conventional diode converter
Distortion of Power-supply Current Waveforms
For saving space
and costs ...
For protecting
against harmonics ...
For energy
efficiency ...
2ms
Motoring
Power-supply
Current Waveform
The VS-656DC5 when combined with an
inverter drive saves energy by efficiently
capturing and storing the energy that is
usually lost during braking.
The power-supply regeneration greatly
increases the efficiency of the drive
system even during deceleration when
hauling heavy loads or with a large
rotational inertia. Also, the VS-656DC5 is
the best device for a common power
supply for a line drive that is continually in
a regenerative state.
Improved Inverter-drive Braking.
2ms
Regenerating
Load
The PWM control synthesizes sine waves from the input current of the
power supply and reduces waveform distortion in the harmonic
current. So, the influence of the harmonic current on devices such as
the phase-shifting capacitor can be eliminated.
Also, no protective measures need to be taken against harmonics,
because the VS-656DC5 conforms to the conditions for self-excited
three-phase bridges (K5 = 0) outlined by the "Japanese Guidelines for
Reduction of Harmonic Emission" (made in compliance with IEC
standards [61000-3-2 and others]) published by the Ministry of
Economy, Trade and Industry in Japan.
Note:
VS-656DC5 sine-wave PWM
The answer is
VS-656DC5!
The answer is
VS-656DC5!
The answer is
VS-656DC5!
Phase
voltage
Phase
voltage
Phase
voltage
Input
current
Input
current
Input
current
Phase
voltage
Input
current
3