KEB COMBIVERT F5, Руководство по эксплуатации, Страница: 12 / 138

12
Electrical Connections
In some conventional installations and many MRL applications, the mo-
tor can be a considerable distance (greater then 40 feet) from the elevator
drive. Under these circumstances the long cable length can cause high
voltage peaks or high dV/dt (rate of voltage rise) on the motor windings.
Depending on the design of the motor, the long runs can cause damage to
the motor winding. Therefore, in these installations the use of a special dV/
dt filter is highly recommended.
The standard approved solution is a special output choke. The choke is de-
signed to be used with a maximum of 16kHz switching frequency and low
inductance so it does not drastically influence the motor’s equivalent circuit
model.
There are three sizes available for motors rated up to 100A - All chokes are
rated for use up to 550VAC. The part numbers and current ratings are listed
below.
Part Number Rated Current
15Z1F04-1005 22A
17Z1F04-1005 42A
21Z1F04-1005 100A
The use of a conventional line or motor choke on the output of the drive is
not recommended since the inductance value is high enough that it would
distort the values in the motor model and result in poor control of the mo-
tor. In addition, these chokes may not be designed to handle the heating
incurred from 16kHz switching operation.
1.2.7. Motor Cable
Length