6 Operation
6.1 Putting the vacuum pump into operation
WARNING
Danger of poisoning due to toxic process media escaping from the exhaust pipe
During operation with no exhaust line, the vacuum pump allows exhaust gases and vapors to escape
freely into the air. There is a risk of injury and fatality due to poisoning in processes with toxic process
media.
► Observe the pertinent regulations for handling toxic process media.
► Safely purge toxic process media via an exhaust line.
► Use appropriate filter equipment to separate toxic process media.
NOTICE
Vacuum pump damage caused by overpressure
Mixing up the connections causes overpressure overload. The vacuum pump can be started only
against max. 1 bar differential pressure between inlet and outlet; otherwise the motor jams and sus-
tains damage.
► Make sure that the distributor is installed correctly on the diaphragm heads, before connecting
the vacuum pump to the vacuum equipment.
► Before commissioning, make completely sure that the pressure side pressure is below the per-
missible limit.
Procedure
1. Compare the frequency specifications on the rating plate with the available supply voltage.
2. Check the exhaust connection for free passage (max. permissible pressure: 1100 hPa absolute).
3. Actuate the shut-off units so that the shut-off units open before or at the same time as the vacuum
pump starts up.
6.2 Switching on the vacuum pump
When pumping down dry gases, no special precautions are required.
Pfeiffer Vacuum supplies the diaphragm pump ex factory for operation without control signal and with
the trimmer turned to the right stop. The diaphragm pump starts directly and rotates at max. rotation
speed.
CAUTION
Danger of burns on hot surfaces
Depending on the operating and ambient conditions, the surface temperature of the vacuum pump
can increase to above 70 °C.
► Provide suitable touch protection.
Warm-up time of the vacuum pump
The warm-up time depends on the ambient temperature and takes at least 30 minutes.
Prerequisite
● required cable connections are established
Switching on the vacuum pump
1. Switch the voltage supply on.
2. If required, switch the vacuum pump on in each pressure range.
3. Allow the vacuum pump to warm up prior to process start, with the vacuum connection closed.
The vacuum pump achieves the specified throughput and final pressure values once the operating tem-
perature has been reached.
Operation
22/42
