NOTICE
Risk of property damage from excess voltage
Incorrect or excessive mains voltage will destroy the motor.
► Always observe the motor rating plate specifications.
► Route the mains connection in accordance with locally applicable provisions.
► Always provide a suitable mains fuse to protect the motor and supply cable in the event of a fault.
NOTICE
Property damage from the voltage range being set incorrectly
Recommissioning after longer downtimes of the vacuum pump or after changing the oil requires the
current settings to be checked.
► Before switching the vacuum pump on each time, check the currently set voltage range.
► Make changes to the voltage range only after the vacuum pump has been disconnected from the
mains.
Depending on the pump type, there are different motor designs or mains voltages:
● Single-phase motor for fixed voltage with
─ inbuilt thermal protection switch,
─ mains switch and
─ rubber connector
● Single-phase motor with reversible voltage range,
─ thermal protection switch,
─ mains switch and
─ rubber connector
Vacuum pumps with single-phase motors are equipped with an installed thermal protection switch. In
event of excess temperature, the protection switch interrupts the motor current, but does not offer a per-
manent shut-down of the motor.
U1
U2
L1
L2 (N)
M
Z1
Z2
21
1
20
Fig. 8:
Motor circuit diagram, single-phase motor with switch
The magnetic coupling does not offer an overload protection.
The magnetic coupling's torque is so strong that it does not provide any overload protection
for the motor.
On-site protection
► For the protection of the motor in case of malfunction, always provide fuse protection according to
the regulations applicable for the region.
Installation
26/60
