Parker Products ViX250AE - Manual (Page 32)

3. ELECTRICAL INSTALLATION 25
recommend not to bond the cable screen to the cabinet at the point of entry. Its function is
to return high-frequency chopping current back to the drive. This may require mounting the
connector on a sub-panel insulated from the main cabinet, or using a connector having an
insulated internal screen from the connector housing. Within the cabinet itself, all the motor
cables should lie in the same trunking as far as possible. Keep the cables separate from any
low-level control signal cables. This applies particularly where the control cables are
unscreened and run close to the drive.
Note: keep the motor cable routing within the equipment cabinet at least 300mm away from
I/O cables carrying control signals.
Motor Phase Contactors
We recommend that motor phase contactors are not used within the motor power cables. As
an alternative, make use of the drive’s power stage ‘enable’ control signal.
Ferrite absorber specifications
The absorbers described in these installation instructions use a low-grade ferrite material
that has high losses at radio frequencies. They therefore act like a high impedance in this
waveband. Produced by Parker Chomerics, the recommended component is suitable for use
with cable having an outside diameter up to 10mm. The specification is as follows:
Chomerics part number H8FE-1115-NC (Parker part number 0313.020)
Outside diameter 17.5mm
Inside diameter 10.7mm
Length 28.5mm
Impedance at 25MHz 80 ohm
Impedance at 100MHz 120ohm
Curie temperature 130°C (the device should not be operated near this temperature)