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, different motor designs or mains voltages can be used:
● 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
The vacuum pumps are equipped with an inbuilt thermal protection switch. In event of excess tempera-
ture, the protection switch interrupts the motor current, but does not offer a permanent 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.
Motor voltage [V], ±10 % Frequency [Hz] Rated (nominal) current
[A]
Recommended fuse,
slow-blow [A]
100
95 – 105
50
60
2.1
2.8
4
5
105
115 – 125
50
60
1.7
2.5
4
5
100/200
100/200
50
60
2.4/1.5
2.2/1.9
6/4
6/4
Installation
25/60
