Multi-motor drive/group drive

  • The total of the motor currents must not exceed the nominal current of the inverter. The maximum permitted cable length for the group is limited to the values of the single connection. See chapter Technical data.
  • The motor group is limited to 5 motors and must not differ by more than 3 sizes.
  • Multi-motor operation is only possible with AC asynchronous motors, not with synchronous motors.
  • SEW‑EURODRIVE recommends using an output choke "HD LT xxx", additionally unshielded cables, and a maximum permitted output frequency of 4 kHz for groups of more than three motors.
Maximum motor cable length

The permitted total length of all motor cables connected in parallel (ltot) must not exceed the maximum permitted motor cable length of the individual inverter (lmax).

Itot

=

Maximum permitted total length of motor cables connected in parallel: ltot = l1 + l2 + ... +ln (l1, l2, ... ln = cable from inverter to motor 1, 2, ...)

Imax

=

Maximum motor cable length (see chapter Technical data)

n

=

Number of motors connected in parallel.

Fusing

No additional fusing is required if the cross section of the motor cable corresponds to that of the supply system cable. If the cross section of the motor cable is smaller than the cross section of the supply system cable, you must secure the motor cable against short circuit on the corresponding cross section. Motor circuit breakers are suitable for this.

Comply with the regulations issued by specific countries and for specific machines regarding fusing and the selection of supply system and motor cables.