bonitron 3484D3, Руководство для пользователей

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User’s Manual
7
3.
O
VERVIEW
Bonitron's model M3484 line filters are designed to be used in applications where power
electronic devices experience problems from line harmonics, capacitor switching
transients and DC drive notching. Typically, devices with these problems have over
voltage faults. Usually, the problems are more severe when the devices are in a standby
or lightly loaded mode. For this reason, chokes alone are unable to filter the transients.
The Bonitron M3484 modules are composed of resistor, diode, and capacitive elements
offering very good electrical damping of continuous and intermittent transients. Each
device includes two parallel filters, one which dampens over voltage events and the other
which dampens under voltage events. The transient/harmonic energy is dissipated in the
resistors. The units are protected by a combination of fusing and thermal protection via
three phase contactor.
The devices require some impedance (at least 5%) between the noise source and their
point of installation for proper filtering. Usually, existing AC chokes or system transformers
provide this impedance.
A
PPLICATIONS
The model M3484 line filter is commonly used on applications involving:
 VFD installations where DC drives in close proximity are causing line notching
 VFD installations where high frequency carrier waveforms or other continuous
oscillations are superimposed on the local power grid
 VFD installations where the three phase power is coupled by brushes or other
means to the VFD (example: overhead cranes)
A
DVANTAGES

Unlike capacitive filters, these modules filter without shifting the resonant frequency
of the electrical system.
 The modules provide additional system kvar for power factor correction and KVA
demand reduction
S
IZING
Proper filter sizing is critical to operation. Consult Bonitron engineering for assistance.

Modules are available for standard line voltages.
 Modules are selected based on resistive watts required to dissipate the
disturbance.
 Modules may be paralleled for additional dissipation.
C
ONSIDERATIONS
 Possible sources of disturbing noise
 Physical distances to possible noise sources
 Harmonic distortion Level
 Electrical transformations between filter and noise sources
 Transformer impedance