Operation
3.2 Operation
The magnetic bearing in the MAG are immune to wear.
In addition to the magnetic bearings, the MAG is equip-
ped 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 when the pump is run-
ning. Shocks perpendicular to the rotation axis are
particularly harmful. If the pump appears to be run-
ning in the mechanical bearings continuously it is
switched off.
• Avoid frequent run up and down. The converter may
overheat. You may run up und down the pump twice
immediately after each other.
• Do not disconnect the MAG and MAG.DRIVE while
they are operating. If MAG and MAG.DRIVE have
been disconnected accidently do not re-connect them
while the MAG is operating.
Warning
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 2.7.
MAG with heating collar:
Warning
The heating collar will be hot during oper-
ation. Burn hazard!
3.3 Switching off
The MAG.DRIVE controls the venting automatically pro-
vided purge gas is connected to the MAG and the
MAG.DRIVE is programmed correspondingly („Vent on“).
Caution
The values shown in the pressure rise
curve must be maintained; see Fig. 42.
Caution
Do not stop the MAG with the mains. Use
the STOP key.
Switching off the mains while the pump is
running will wear out the touch down
bearings.
• Press the STOP key.
Deceleration
20.0 A 400 Hz
will be displayed. When the display reads
Ready
0.0 A 0 Hz
the pump has come to a standstill.
• Close the cooling water supply when the pump is
switched off in order to avoid condensate formation in
the pump.
The backing pump may be switched off once the MAG
has stopped.
If the MAG has been used for pumping corrosive gases
it should be purged with dry nitrogen for one hour before
switching off. During down times of the system take care
that neither ambient air nor cleaning agents enter the
pump.
41
GA 05.130/3.02 - 05/98
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