●
Measure the drive motor current and record it as reference for fu-
ture maintenance and troubleshooting work
Version with exhaust filter pressure gauge:
◆
Read the scale of the exhaust filter pressure gauge and record
it as reference for future maintenance and troubleshooting
work (
Ú
page 10: Checks during Operation)
Operation Notes
Use
CAUTION
_a
The vacuum pump is designed for operation under the conditions
described below.
In case of disregard risk of damage or destruction of the vacuum
pump and adjoining plant components!
Risk of injury!
The vacuum pump must only be operated under the conditions de-
scribed below.
The vacuum pump is intended for
–
the suction
of
–
air and other dry, non-aggressive, non-toxic and non-explosive
gases
Conveying media with a lower or higher density than air leads to an in-
creased thermal and/or mechanical load on the vacuum pump and is
permissible only after prior consultation with Busch.
Permissible temperature range of the inlet gas: see “Oil”, “Ambient
temperature range”
In case the vacuum pump is equipped with a gas ballast (optional) wa-
ter vapour within the gas flow can be tolerated within certain limits
(
Ú
page 8: Conveying Condensable Vapours). The conveyance of
other vapours shall be agreed upon with Busch.
The vacuum pump is intended for the placement in a non-potentially
explosive environment.
Version with oil return line to the B-cover (RA ... C, 2 mbar):
Version with oil return line to the suction connection (RC ... C):
The vacuum pump is thermally suitable for continuous operation
(100 percent duty).
Version with oil return valve (RA ... C, 0.5 mbar):
The vacuum pump is thermally suitable for continuous operation (ob-
serve the notes with regard to the oil recirculation:
Ú
page 3: Oil Cir-
culation;
Ú
page 8: Oil Return).
The vacuum pump is ultimate pressure proof.
CAUTION
_ac
During operation the surface of the vacuum pump may reach tem-
peratures of more than 70 °C.
Risk of burns!
The vacuum pump shall be protected against contact during opera-
tion, it shall cool down prior to a required contact or heat protection
gloves shall be worn.
CAUTION
_a
The gas conveyed by the vacuum pump contains remainders of oil.
Aspiration of process gas over extended periods can be harmful.
The room into which the process gas is discharged must be suffi-
ciently vented.
●
Make sure that all provided covers, guards, hoods etc. remain
mounted
●
Make sure that protective devices will not be disabled
●
Make sure that cooling air inlets and outlets will not be covered or
obstructed and that the cooling air flow will not be affected ad-
versely in any other way
●
Make sure that the installation prerequisites (
Ú
page 5: Installation
Prerequisites) are complied with and will remain complied with,
particularly that a sufficient cooling will be ensured
Oil Return
Only for version with oil return valve (RA ... C, 0.5 mbar):
During operation oil accumulates at the bottom of the upper chamber
of the oil separator (e), which cannot flow down into the bottom
chamber, as long as the vacuum pump runs (for detailed description:
Ú
page 3: Oil Circulation).
At the latest after 2 hours of continuous operation, in case of high
pressure difference between suction side and pressure side after a
shorter period, the vacuum pump must be shut down for at least
15 minutes, so that the oil can run down from the upper chamber of
the oil separator (e) into the bottom chamber.
Note
: This is a good
time to check the temperature, the level and the colour of the oil.
Conveying Condensable Vapours
CAUTION
_a
Residual condensates dilute the oil, deteriorate its lubricating prop-
erties and can cause a seizure of the rotor.
Apply a suitable operating method to make sure that no conden-
sates remain in the vacuum pump.
In order to use the vacuum pump for the conveyance of
condensable vapours, the vacuum pump must be equipped with a
shut-off valve in the suction line and with a gas ballast.
●
Close the shut-off valve in the suction line
●
Operate the vacuum pump with the suction line shut off for
approx. half an hour, so that the operating temperature rises to
approx. 75 °C
At process start:
●
Open the shut-off valve in the suction line
At the process end:
●
Close the shut-off valve in the suction line
●
Operate the vacuum pump for another approx. half an hour
8
