Lenze ELM3−004H055 - Manual (Page 21)

EDKLM3−XXX−001 DE/EN/FR 1.1
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Type code E LM 3 − xxxH xxx
Product series
Filter type
LM = motor filter
Phases
3 = 3 phases
Inductance
e.g. 30 = 3.0 mH
Rated current (partly rounded)
e.g. 004 = 4 A
Application range
Motor filters are applied to reduce the motor cable load and to decrease capacitive
discharge currents to PE in long motor cables.
A motor filter is required:
ƒ in very long motor cables (regardless of the compliance with EMC limit values).
Motor cables must comply with EMC limit values only with regard to conducted
interference emission.
ƒ When operating motors whose insulation systems are not suitable for inverter
operation. Lenze motors have insulations with greater thermal reserves.
Please note:
ƒ Operation is only permissible if a V/f or V/f
2 characteristic control and a switching
frequency of 4 ... 16 kHz is applied.
– The filter will overheat if it is operated at a switching frequency < 4 kHz.
– Ensure that the automatic switching frequency reduction is deactivated (see
documentation of the standard device).
ƒ The frequency inverter is loaded with an additional 12 per cent, approximately, of the
rated current of the motor filter.
ƒ The voltage drop at the motor filter averages 2−3 per cent of the max. output voltage
of the frequency inverter if the rated current of the motor filter and a frequency of 50
Hz is applied.
ƒ Overvoltages are supplied into the DC bus (+UG/−UG) via the motor filter. In this case,
the application of the motor filter in DC−bus operation is permissible.