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Du/dt filtering suppresses inverter output voltage
spikes and rapid voltage changes that stress motor
insulation. For information the
construction the motor insulation, consult the
manufacturer.
When needed? The need for du/dt filtering de
pends the motor insulation.
Non-ABB Form -wound 600 690 the otor insulation system ithstands ÛLL=2000 and At=0. the motor does not fulfil the following
requirements, the lifetime the motor might shorten.35 times the mains network voltage
with very short rise time.
500 600 Standard insulation system conjunction with du/dt filtering reinforced insulation.
ABB form ound
HXR and otors
380 690 Standard insulation system.
3AFE 68248531 REV 31.
600 690 Reinforced insulation system conjunction ith /dt filtering. Additionally, du/dt filtering reduces capaci
tive leakage currents and high frequency emission of
the motor cable well high frequency losses and
bearing currents the motor.
Insulated N-end (non-driven end) bearings and or
common mode filters are also required for motor
bearing currents with motors bigger than 100 kW.2 ^s, du/dt filtering is
not required.e.
As with all frequency converters employing the most
modern IGBT inverter technology, the ACS800 output
comprises regardless output frequency pulses of
approximately 1. For
more information see the ACS800 hardware manuals.
U Peak line line voltage otor term inals.
ABB random -wound
HXR and otors
380 690 Check otor insulation system ith the otor manufacturer. The voltage can almost
double the motor terminals, depending motor
cable properties.
N on-ABB
R andom ound
Un 420 Insulation system must ithstand ÛLL=1300 V.
420 500 the insulation system ithstands ÛLL=1600 and At=0.
Sym bol Explanation
Un Nominal ains voltage.
du /dt filtering with voltages over 500 V.
Filter selection table for ACS800
M otor type Nominal mains
voltage (Un)
M otor insulation requirem ent
ABB and
M3 otors
Un 500 Standard insulation system.2004 25
. With du/dt filtering, the insulation system must withstand ÛLL=1300 V.3 ^s,
du /dt filtering not required.Output filters
Factory installed filters.
A Rise tim i.3. .
W ith /dt filtering, the insulation system must ithstand ÛLL=1600 V. interval during hich line line voltage otor term inals changes from 10% 90%
of full voltage range.
500 600 the insulation system ithstands ÛLL=1800 /dt filtering not required.
600 690 the otor insulation system ithstands ÛLL=1800 du/dt filtering not required
