Check The Direction Of Rotation; Inlet And Outlet Connections - Edwards RV3 Instruction Manual

4.7.3 Check the direction of rotation

CAUTION:
Ensure that the pump-motor rotates in the correct direction. If it does not, the pump
and vacuum system can become pressurised.
1. Refer to
cover (13).
2. Switch-on the electrical supply to the motor for a few seconds.
3. Check that the motor cooling-fan rotates in the correct direction shown by the
arrow on the motor mounting plate. If the direction of rotation is incorrect:
▪
▪
▪
▪

4.8 Inlet and outlet connections

WARNING:
Connect the exhaust to a suitable treatment plant to prevent the discharge of
dangerous gases and vapours to the surrounding atmosphere. Use a catchpot to
prevent the drainage of contaminated condensate back into the pump.
Before connecting the pump to the vacuum system, fit the centring-ring and inlet-filter
(supplied with the pump) to the pump inlet-port (see
Take note of the following information when connecting the pump to the vacuum
system. Refer to
below. Use standard NW25 fittings (not supplied) when connecting the pump.
▪ For optimum pumping speeds, ensure that the pipeline connected to the pump-
inlet is as short as possible and has an internal diameter of 25 mm or larger.
▪ Support the vacuum pipelines to prevent loading of the coupling-joints.
▪ If necessary, incorporate flexible bellows in the system pipelines to reduce the
transmission of vibration and to prevent loading of coupling-joints. If using flexible
bellows, ensure that bellows which have a maximum pressure rating which is
greater than the highest pressure that can be generated in the system are used.
We recommend using manufacturers flexible bellows.
▪ Use a suitable inlet trap if pumping condensable vapours or if the pump is to be
used for very dusty applications.
▪ Use a suitable valve to isolate the pump from the vacuum system if pumping
condensable vapours or to maintain vacuum when the pump is switched off.
▪ Ensure that sealing surfaces are clean and scratch-free.
In any of the following circumstances, fitting an oil mist filter to the pump outlet is
recommended:
A65201880_AA
A65201880_AA - Installation
Figure: The RV pump. Watch the motor cooling-fan through the motor fan-
Switch off the electrical supply immediately.
Isolate the pump from the electrical supply.
Remove the terminal-box cover and swap wires L1 and L3: see
phase electrical connections: 200–230 V
connections: 380–460
Refit the cover to the terminal-box.
Service and spares
and
V.
Figure: Dimensions (mm)
on page 50 for details of the accessories mentioned
Page 32
Figure: Three-
Figure: Three-phase electrical
03/2021 - ©Edwards Limited
(item 4)).