Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check
carefully the validity of this document with respect to his product. Manual-no.: 999084 / 05/10/2009
page 13 of 46
Prior to use:
☞
Maximum ambient temperature
: 30 °C or 40 °C (See ”Technical Data - VNC 1”).
☞
Make sure ventilation is adequate if pump is installed in a housing or if ambient
temperature is elevated. Keep a distance of minimum 20 cm between fans and
ambient parts.
☞
If pump is installed in altitudes of more than 1000 m above mean sea level check
compatibility with applicable safety requirements, e. g. IEC 60034 (motor may over-
heat due to insufficient cooling).
☞
If the gas ballast valve is open, a power failure may cause unintentional ventilation
of the pump. In case this constitutes a potential source of danger, take appropriate
safety measures.
☞
When assembling, ensure
vacuum-tightness
. After assembly, check the complete
system for leaks.
During operation:
Do not start pump if
pressure difference
between inlet and outlet port exceeds
maxi-
mum 1 bar
. Attempts to start pump at higher difference may cause blockade and
damage of the motor.
☞
Check compatibility with
permissible maximum pressure
at outlet and
maxi-
mum pressure difference
between inlet and outlet ports. Due to the high compres-
sion ratio of the pumps, pressure at the outlet port might be generated being higher
than the max. permitted pressure compatible with the
mechanical stability
of the
system.
The pump achieves its
pumping speed, ultimate total vacuum
and vapour pumping
rate only at operating temperature (after approx. 15 minutes).
☞
Prevent internal condensation, transfer of liquids or dust. The diaphragm and valves
will be damaged, if liquids are pumped in significant amounts.
☞
Let the pump run with
gas ballast
to reduce condensation of pumped substances
(water vapour, solvents, ....) in the pump.
In case of overload the motor is shut down by a
thermal cutout
in the winding.
☞
Manual reset is necessary. Switch off the pump or isolate the equipment from mains.
Wait approx. five minutes before restarting the pump. Identify cause of failure and
eliminate.
☞
Attention
: In case of
supply voltage below 100V
, the lock of the cutout might be
restricted and the pump might restart on its own after sufficient cooling down. Take
suitable precautions, if an automatic restart of the pump may lead to a critical
dangerous situation
Permissible maximum pressure at the pressure transducer
(vacuum connection at controller): 1.5 bar (absolute).
☞
At pressures higher than 1060 mbar the
display flashes.
Error
message ”
p Error
” appears, four beeps.
➨
Immediate pressure relief necessary!
Risk of bursting!
Attention:
At pressures above 1100 mbar the device does
no longer display the correct pressure values (pressure trans-
ducer saturated).
vacuum connection at the controller
☞
Comply with permissible maximum pressure and pressure differences at the pump.
☞
Inside a vacuum system where evaporation occurs, e. g. rotary evaporator, the vacuum is not uniform.
This effects the measured pressure and thus the process control. E.g. a condenser acts as pump or the
vacuum in the pipeline is lower than in the system. Therefore carefully choose position where to instal
the vacuum connection to the controller.
☞
In order to avoid malfunction it is important to position the controller so as to avoid flow of condensate
towards the pressure transducer.
