LEYBOLD MAG Series User Manual

GA05141_0702 - 09/2004
66
Operation
3 Operation
3.1 General operation rules
The magnetic bearing in the MAG are immune to wear. In addition to the
magnetic bearings, the MAG is equipped with touch-down bearings which
protect the rotor against mechanical contact with the stator if the pump is
subjected to external shock loading or when the pump is switched off.
These touch-down bearings have a limited service life. Please observe the
following in order to obtain maximum service life.
■ Avoid shock and vibrations (e.g. from other pumps) when the pump is
running. Shocks perpendicular to the rotation axis are particularly harm-
ful. If the pump appears to be running in the mechanical bearings con-
tinuously it is switched off.
■ Do not suddenly expose the MAG to an already evacuated vacuum
chamber. The pressure surge may cause the rotor to make contact with
the touch-down bearings. This will cause increased wear.
■ Do not disconnect the MAG and MAG.DRIVE while they are operating.
If MAG and MAG.DRIVE have been disconnected accidently re-connect
them.
■ Do not stop the MAG with the mains. Use the STOP key or a stop com-
mand. Switching off the mains while the pump is running will wear out
the touch down bearings.
The pump may make noise during the run-up and run-down phases. This
has neither an influence on the pump nor on the process.
Monitor the purge gas continuously.
Insufficient purge gas flow can result in:
■ Process gases entering the motor and bearing area of the MAG
■ Process gases escaping from the purge gas valve
■ Humidity entering the pump.
Refer to Section 2.6.
The pump can become so hot during operation that it represents
a burn hazard:
Frequent acceleration and deceleration of the pump or operating cycles
between stand-by and normal operation put pressure on the rotor.
Therefore it has to be changed after 5000 start or stand-by cycles.
Warning
Warning
Protecting the
touch-down bearings

LEYBOLD MAG Series Specifications

General

Applications	Laboratory, medical, and industrial applications
Drive	Magnetic drive
Sealing	Hermetically sealed
Flow Rate	Varies depending on the model, ranging from a few liters per minute (LPM) to several tens of LPM. Consult specific model datasheets for precise values.
Max Pressure	Varies by model (typically up to 10 bar)
Power Supply	Typically available in various AC voltages (e.g., 115V, 230V) and frequencies (50/60 Hz)
Power Consumption	Varies depending on the model, ranging from a few watts to several hundred watts. Consult specific model datasheets for precise values.
Operating Temperature	Typically 0°C to +60°C
Weight	Varies depending on the model, ranging from a few kilograms to several kilograms. Consult specific model datasheets for precise values.
Dimensions	Varies depending on the model. Consult specific model datasheets for precise dimensions.
Materials	Stainless steel