Elmo Rietschle L-BV7 - Manual (Page 19)

© Gardner Denver Deutschland GmbH 19 / 64 610.48060.40.000
Description of Vacuum Pump/Compressor
5.3 Operating
modes
The pump-motor unit can function in several
different operating modes.
These differ in how the pump-motor unit is
supplied with operating liquid:
 Self-priming operation
 Operation with operating-liquid feed:
– Non-automatic operation
– Automatic operation
5.3.1 Self-priming
operation
In this operating mode the pump-motor unit
automatically sucks in the operating liquid.
The operating-liquid flow rate is automatically
adjusted.
See Fig. 8, Pg. 30.
5.3.2 Operation with operating-liquid feed
In this operating mode the pump-motor unit
DOES NOT automatically suck in the operating
liquid.
A certain volume flow ("nominal operating-
liquid flow rate") or pre-pressure must be set
for the operating liquid.
Here the following additional distinctions are
made:
Non-automatic operation
In this case the operating liquid feed is
switched on and off manually with a stop valve.
See Fig. 11, Pg. 32.
Automatic operation
In this case the operating liquid feed is
switched on and off by a solenoid valve. The
solenoid valve is dependent on the motor
operating mode:
 Motor/pump-motor unit switched on:
Valve open.
 Motor/pump-motor unit switched off:
Valve closed.
See Fig. 12, Pg. 32.
NOTICE
The following is dependent on
the operating mode:
 when and how the pump-
motor unit must be filled with
operating liquid the first time,
 how the pump-motor unit is
put into operation.
The specifications for this are
contained in Chapter 7,
"Installation", Pg. 22ff., and
Chapter 8, "Commissioning",
Pg. 28ff.