Start-Up Procedure; To Achieve Ultimate Vacuum - Edwards RV3 Instruction Manual

5.3 Start-up procedure

WARNING:
Ensure that the system design does not allow the exhaust pipeline to be blocked.
If the oil is contaminated, or if the pump temperature is below 12 °C, or if the electrical
supply voltage is more than 10% below the lowest voltage specified on the voltage
indicator
may operate at a reduced speed for a few minutes. On single-phase pumps, if the pump
continues to operate at reduced speed, the motor thermal overload device will open
and stop the pump. When the motor has cooled, the thermal overload device will reset
automatically and the pump will restart.
1. Check that the pump oil-level is between the MAX and MIN marks on the bezel of
the oil-level sight-glass; if it is not, refer to
2. Turn the mode selector fully clockwise to select High Vacuum mode S or fully
anticlockwise to select High Throughput mode S , as required (refer to
oil-level
3. Turn the gas-ballast control to position '0', 'I' or 'II', as required (refer to
control
4. Switch on the electrical supply to the pump; on single-phase pumps, use the on/off
switch.
5. In order to achieve ultimate vacuum, to pump condensable vapours or to
decontaminate the pump oil, refer to the procedures in
vacuum
decontaminate the oil
system isolation-valve.

5.4 To achieve ultimate vacuum

If the pump does not achieve the performance specified in
make sure that this is not due to the system design before contacting us or the supplier
for advice. In particular, the vapour pressure of all materials used in the vacuum system
(including pump oil, see below) must be much lower than the specified ultimate vacuum
of the pump. Refer to
failed to reach ultimate vacuum)
achieve the specified performance. Note however that the most common causes are:
▪ The pressure measurement technique or gauge head is unsuitable or the gauge
head is faulty.
▪ If an oil other than the recommended oil has been used, and the vapour pressure
of the oil is higher than the specified ultimate vacuum of the pump.
Use the following procedure to achieve ultimate vacuum:
1. Isolate the RV pump from the vacuum system.
2. Turn the mode selector to select High Throughput mode S , set the gas-ballast
control to low flow (position 'I') and operate the pump for at least 1 hour (or
overnight) to thoroughly purge the oil of contaminants.
A65201880_AA
A65201880_AA - Operation
(Figure: Motor voltage configuration: single-phase
on page 41).
on page 36).
on page 37, To pump condensable vapours
on page 38 respectively. Otherwise, open the vacuum
The pump has failed to achieve the specified performance (has
Check the oil-level
on page 47 for a list of possible causes for failure to
Page 37
pumps, item 3), the pump
on page 41.
Check the
Gas-ballast
To achieve ultimate
on page 38 and To
Performance on page 13,
03/2021 - ©Edwards Limited