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 specied on the voltage
indicator (Figure: Motor voltage conguraon: single-phase pumps, item 3), the pump
may operate at a reduced speed for a few minutes. On single-phase pumps, if the pump
connues 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
automacally 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 Check the oil-level on page 41.
2.
Turn the mode selector fully clockwise to select High Vacuum mode S or fully
anclockwise to select High Throughput mode S, as required (refer to Check the
oil-level on page 41).
3.
Turn the gas-ballast control to posion ‘0’, ‘I’ or ‘II’, as required (refer to Gas-ballast
control on page 36).
4. Switch on the electrical supply to the pump; on single-phase pumps, use the on/o
switch.
5. In order to achieve ulmate vacuum, to pump condensable vapours or to
decontaminate the pump oil, refer to the procedures in To achieve ulmate
vacuum on page 37, To pump condensable vapours on page 38 and To
decontaminate the oil on page 38 respecvely. Otherwise, open the vacuum
system isolaon-valve.
5.4 To achieve ulmate vacuum
If the pump does not achieve the performance specied in Performance on page 13,
make sure that this is not due to the system design before contacng us or the supplier
for advice. In parcular, the vapour pressure of all materials used in the vacuum system
(including pump oil, see below) must be much lower than the specied ulmate vacuum
of the pump. Refer to The pump has failed to achieve the specied performance (has
failed to reach ulmate vacuum) on page 47 for a list of possible causes for failure to
achieve the specied 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 specied ulmate vacuum of the pump.
Use the following procedure to achieve ulmate 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 ow (posion ‘I’) and operate the pump for at least 1 hour (or
overnight) to thoroughly purge the oil of contaminants.
03/2021 - ©Edwards Limited
Page 37A65201880_AA
A65201880_AA - Operaon

Edwards RV3 Specifications

General

Brand	Edwards
Model	RV3
Category	Water Pump
Language	English