Lenze 7812 - Motor Connection; Connection of Braking Resistor(S)

ET4 6/fa
checked: 19.04.89 MB 33.0831 GB
page: II
5.14 Motor corYnection
‚~ screened
motor cable
three-phase motor 3
— Ihe nominal motor voltage is
normally selected such that it
corresponds to the available
nominal mains voltage
e.g. 380V motor at 380V mains
460V motor at 460V mains
— lt the nominal mains voltage
exceeds the nominal motor
voltage, the inverte.r‘soutput
characteristic can be pro—
grammed as described urider
turietion code 10.
— Switching of the phases is only
permissible with the circuit as
described under polnt 5.13.
(*) Valid tor industrial plants and factories which must have
levels ot radio interferencesuppression in compliance with
VDE 0871. lt necessary, please consult the supplier.
5.15 Connection of braking resistor(s
)
— Application: Short braking times
with large masses.
— The energy produced in the „gene -
rator rnode“ is fed into the
DC link circuit ot the Inverter
and results in an iricrease of the
DC link voltage and current, when
operating without a braking chopper.
The inverter sets TRIP.
Fault indication: OC 2 or OU.
— Using a braking resistor or acti—
vating the internal braking chopper
(See tiinctlon code 23) causes the
excessive energy to be dlssipated
as heat.
The ~?D(~cified brake resistor~ ~re
1.sted in the table on page 21.
* ?or settir. ot the release
current see table an page 21).
brake resistor