Selection Of The Motor Cable; Connection Of The Motor - KEB COMBIVERT F5 Series Instruction Manual

Connection Power Unit
2.8.2

Selection of the motor cable

Correct selection and wiring of the motor cable is very important:
• lower abrasion of the motor bearings by leakage currents
• improved EMC characteristics
• lower symmetrical operating capacities
• less losses by transient currents
2.8.3

Connection of the motor

As a standard the connection of the motor must be carried out in accordance with the fol-
lowing table:
Connection of the motor
230 V
Delta
Motor connection in star connection
PE
GB - 26
230/400 V motor
U1 V1 W1
W2 U2 V2
The connecting-up instructions of the motor manufacturer are generally valid !
Inverters switch at the output with a du/dt of approx. 5kV/µs.
Protect motor Especially in case of long motor lines (> 15 m) voltage peaks
against voltage at the motor can occur which endanger the isolation system.
peaks ! A motor choke, a du/dt filter or sine-wave filter can be used to
protect the motor.
400 V
Star
Motor connection in delta connection
PE
400/690 V motor
400 V
Delta
U1 V1 W1
W2 U2
690 V
Star
V2