6
Operating modes and limit values
Group drive
Operating Instructions – EDR..71 – 315, EDRN63 – 315
124
6.8
Group drive
Group drive means that several motors are operated simultaneously on one inverter.
INFORMATION
Only EDR../EDRN.. motors of category 3D may be operated in group drive.
Motors in 3D design may be used as group drives in zone 22 if each individual motor
of the group has been configured, designed, and identified for inverter operation.
The following restrictions apply:
•
For applications, the individual motors must be connected slip-free, non-positive,
or positive.
•
Only identical motors may be used, which means motors with the same rated data
(power, speed, voltage, and frequency).
•
The following condition must be met:
Nominal output current of inverter ≤ 1.5 x sum of nominal motor currents.
•
Each motor must be designed with a thermal motor protection (PTC thermistor).
•
Each individual temperature sensor must be externally monitored by a separate
evaluation unit.
•
If one evaluation unit trips, all motors of the group must be stopped.
•
A maximum of 4 motors may be operated on one inverter.
•
The maximum speed of the motors must not exceed 1800 min
-1
.
25896334/EN – 06/2019