6 | Electrical Connection
20 | 44
Instruction Manual COBRA NX 0950 A WCV_EN_en
6.1
Machine delivered with a Variable Speed Drive
DANGER
Live wires. Carry out any work on the variable speed drive and motor.
Risk of electrical shock!
●
Electrical installation work must only be executed by qualified personnel.
DANGER
Maintenance work without disconnecting the variable speed drive.
Risk of electrical shock.
●
Disconnect and isolate the variable speed drive before attempting any work on it.
High voltages are present at the terminals and within the variable speed drive for up to 10 min-
utes after disconnection of the electrical supply.
●
Always ensure by using a suitable multimeter that no voltage is present on any drive power termi-
nals prior to commencing any work.
NOTICE
The admissible motor speed exceeds the recommendation.
Risk of damage to the machine!
●
Check the admissible motor speed range, see Technical Data.
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).
NOTICE
Incorrect connection.
Risk of damage to the variable speed drive!
●
The wiring diagrams given below are typical. Check the connection instructions/diagrams.
●
Make sure that the power supply for the drive is compatible with the data on the nameplate of
the variable speed drive.
●
If the machine is equipped with a power connector, install a residual current protective device to
protect persons in case of isolation default.
●
Busch recommends installing a type B residual protective device suitable for the electrical in-
stallation.
●
If the variable speed drive is not equipped with a lockable disconnect switch, provide it on the
power line so that the machine is completely secured during maintenance tasks.
