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Du/dt filters
As with all frequency converters employing the most
m odern inverter technology, the ACS800 output
comprises regardless output frequency pulses of
approximately 1. For information on
the construction the motor insulation, consult the
manufacturer.
At Rise time, i.
M3 motors 500 600 Standard insulation system conjunction with du/dt filtering reinforced insulation. For
more information see the ACS800 hardware manuals. the motor does not fulfil the following
requirements, the lifetime the motor might shorten.2009 Hardware options 29
.
With du/dt filtering, the insulation system must withstand Ull=1600 V.35 times the mains network voltage
with very short rise time.
With du/dt filtering, the insulation system must withstand Ûll=1800 V.
Symbol Explanation
Un Nominal mains voltage.
Insulated N-end (non-driven end) bearings and or
com ode filters are also required for motor
bearing currents with motors bigger than 100 kW.
HXR and motors du/dt filtering with voltages over 500 V.2 ps, du/dt filtering not required.
Du/dt filtering suppresses inverter output voltage
spikes and rapid voltage changes that stress otor
insulation.
HXR and motors
ABB random-wound 380 690 Check motor insulation system with the motor manufacturer.
Filter selection table for ACS800
Motor type Nominal mains Motor insulation requirement
vo|tage (UJ
ABB and 500 Standard insulation system.
3AFE68248531 REV 20.
With du/dt filtering, the insulation system must withstand Ûll=1300 V.
W hen needed? The need for du/dt filtering
depends the motor insulation.
600 690 Reinforced insulation system conjunction with du/dt filtering.
Random-wound and
Form-wound
420 500 the insulation system withstands Ull=1600 and At=0.
ABB form-wound 380 690 Standard insulation system.3 ps, du/dt filtering not required. Additionally, du/dt filtering reduces
capacitive leakage currents and high frequency
emission the otor cable well high frequency
losses and bearing currents the motor. interval during which line line voltage motor terminals changes from 10% 90% full voltage range.
U Peak line line voltage motor terminals. The voltage can almost
double the otor terminals, depending otor
cable properties.2.e.
600 690 the motor insulation system withstands Ull=2000 and At=0.
500 600 the insulation system withstands Ull=1800 du/dt filtering not required.
Non-ABB 420 Insulation system must withstand Ull=1300 V
