Operating instructions

39
Note: Missing numbers can be found in the design manual or can be delivered on request
VLT® HVAC Drive Accessories
VLT® Harmonic Filter AHF 005/010
VLT® Sine-Wave Filters
VLT® dU/dt filter
SVCD – regenerative braking
Easy, eff ective harmonic distortion reduction by
connecting the AHF 005/010 harmonic fi lter in front of
a Danfoss frequency converter.
■ AHF 005 reduces total harmonic current distortion
to 5%
■ AHF 010 reduces total harmonic current distortion
to 10%
Sine-wave fi lters are placed between the frequency
converter and the motor to optimise the motor power
current.
It provides a sinusoidal phase-to-phase motor
voltage. The fi lters reduce motor insulation stress,
acoustic noise from the motor, and bearing currents
(especially in large motors).
VLT® dU/dt fi lters are placed between the frequency
converter and the motor to eliminate very fast voltage
changes.
The motor terminal phase-to-phase voltage is still
pulse shaped but its dU/dt values are reduced.
Transferring the generated power from a decelerating
motor back into the power supply enables braking
of virtually unlimited duration.
■ Energy effi cient braking
■ Self-synchronisation
■ Small compact housing that can be fi tted
into a panel
■ Easy to use in retrofi t applications
■ User-friendly start-up – no adjustment necessary
■ No routine maintenance required
■ Reduces motor insulation stress
■ Reduces acoustic noise from the motor
■ Reduces bearing currents (especially in large
motors)
■ Enables use of longer motor cables
■ Reduces losses in the motor
■ Prolongs service lifetime
■ IP 20/Chassis; IP 21/Type 1
■ These fi lters reduce stress on the motor’s insulation
and are recommended in applications with older
motors, aggressive environments or frequent brak-
ing which cause increased DC link voltage.
■ IP 20/Chassis; IP21/Type 1
■ DC-DC coupling of multiple drives possible
■ High effi ciency through IGBT technology
■ Simple operation
■ Overload protection in regenerative operation