5 | Installation
14 | 36
Instruction Manual COBRA NC 0500 B_EN_en
●
Provide a lockable disconnect switch on the power line so that the machine is completely secured
during maintenance tasks.
●
Provide an overload protection according to EN 60204-1 for the motor.
●
Make sure that the motor of the machine will not be affected by electric or electromagnetic
disturbance from the mains; if necessary seek advice from Busch.
●
Connect the protective earth conductor.
●
Electrically connect the motor.
NOTICE
The admissible motor nominal speed exceeds the recommendation.
Risk of damage to the machine!
●
Check the admissible
motor nominal speed (n
max
) on the nameplate of the machine (NP).
●
Make sure to comply with it.
●
NOTICE
The motor frequency is below 20 Hz.
Risk of damage to the machine!
●
The motor nominal speed must always be higher than 1200 min
-1
(20 Hz).
5.5.1
Wiring Diagram Three-Phase Motor (Pump Drive)
Delta connection (low voltage):
Star connection (high voltage):
U1
V1
W1
U2
V2
W2
Earth
L1
L3
L2
U1
V1
W1
U2
V2
W2
Earth
L1
L3
L2
Earth
Earth
NOTICE
Incorrect direction of rotation.
Risk of damage to the machine!
●
Operation in the wrong direction of rotation can destroy the machine in a short time! Prior to
start-up, ensure that the machine is operated in the right direction.
The intended rotation direction of the motor is defined by the illustration below:
