17
4.7. Shutting Down For Longer Periods
If aggressive or hazardous gases are pumped
there is a danger of personal injury resulting
from coming into contact with process gases.
Before removing a turbopump from the system,
first:
– Vent the turbopump with a neutral gas or dry air.
– Ensure that there is no residual process gas in the system
nor in the feeder lines.
If the turbopump is to be shut down for more than a year:
➡
Remove turbopump from the system.
➡
Change the lubricant reservoir (see section 7.2.).
Lubricant TL 011 should not be used when there
have been no operations for 33 yye
ea
arrss..
➡
Close the high vacuum flange and evacuate the turbopump
via the fore-vacuum flange.
➡
Vent turbopump via the venting connection with nitrogen
or dry air.
➡
Close the fore-vacuum and venting connections by blank
flanging.
➡
Place the pump vertically on its rubber feet.
➡
Storage the pump only indoors at a permissible ambient
temperature between -25° C and + 55° C.
➡
In rooms with moist or aggressive atmospheres, the turbo-
pump must be air-sealed in a plastic bag together with a
bag of dessicant.
If the pump has been shut down for 33 yye
ea
arrss, the
bearing must be changed (please contact
Pfeiffer Vacuum Service).
☞
PLEASE NOTE
☞
PLEASE NOTE
WARNING
For the vertex of the power characteristic line please refer to
section “Technical Data”. Maximum power is applied when
the pump starts in order to limit the time required. Once the
set rotation speed is attained, switching to the selected
power characteristic line is automatic. If the gas dependent
maximum power is exceeded, the rotation speed is reduced
until equilibrium between the permissible power and gas fric-
tion is attained. The power limitation serves to protect the
pump against thermal overloading. In order to avoid rotation
speed fluctuations it is recommended to set, in rotation speed
setting mode, the equilibrium frequency or a somewhat lower
frequency.
4.5.Operations With DCU 001/DCU 100
or HPU 001
Where the turbopump is operated via Pfeiffer
Vacuum display and operating units, the remo-
te plug on the TC 600 must be disconnected.
Operations with the DCU or HPU 001 should be carried out in
accordance with the relevant operating instructions (see
“accessories”).
4.6. Switching Off And Venting
Before coming to rest after switching off, the turbopump must
be vented in order to prevent contamination.
➡
Close the fore-vacuum line. Switch off the backing pump
or close the fore-vacuum valve (if connected).
➡
Switch off the turbopump with switch S1 on the power
supply.
➡
Venting
There are three possibilities to vent turbopump:
– M
Ma
an
nu
ua
all vve
en
nttiin
ng
g
Open the venting screw (on delivery, screwed in) on the
venting connection about one turn.
– V
Ve
en
nttiin
ng
g w
wiitth
h tth
he
e V
Ve
en
nttiin
ng
g V
Va
allvve
e T
TV
VFF 000055 (accessories)
Venting release via the remote control (see section 4.7.) or
via the serial interface with DCU, HPU or PC (see operating
instructions "Pumping Operations With The DCU").
– V
Ve
en
nttiin
ng
g iin
n ttw
wo
o sstta
ag
ge
ess when the vacuum chamber should
be vented as quickly as possible.
First stage: venting with a pressure increase rate of
15 mbar/s for 20 seconds.
Second stage: venting with an optionally large venting
valve.
The valve cross-section for a venting rate of 15 mbar/s must
be compatible with the size of the vacuum chamber. Where
small vacuum chambers are involved, the Pfeiffer Vacuum
venting valve TVF 005 can be used for first stage venting.
➡
Shut off water supply (if installed).
☞
PLEASE NOTE
