Pfeiffer Vacuum DUO 5 MC, Руководство по эксплуатации, Страница: 25 / 60

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.
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
─ Connecting cable
● Three phase motor (without switch and mains cable)
5.5.1 Connecting single-phase motors
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. Once the engine has cooled, the vacuum pump restarts automatically.
U1 U2
L1 L2 (N)
M
Z1
Z2
21
1
20
Fig. 9: Motor circuit diagram, single-phase motor with switch
On-site protection
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.
► 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], ±5 % Mains frequency
[Hz]
Rated (nominal) cur-
rent [A]
Recommended fuse,
slow-blow [A]
95 – 120
105 – 120 50
60 5.5
5.9 16
16
200 – 240
208 – 240 50
60 2.75
2.95 6
6
220 – 240
220 – 240 50
60 3.1
2.7 6
6
Tbl. 5: Recommended fuse ratings for on-site protection
Installation
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