BUSCH DOLPHIN VL Systems, Instruction Manual Supplement

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Commissioning | 7
Instruction Manual Supplement DOLPHIN VL Systems_EN_en 19 | 36
7 Commissioning
CAUTION
During operation the surface of the machine may reach temperatures of more than 70°C.
Risk of burns!
●
Avoid contact with the machine during and directly after operation.
NOTICE
The machine is running without operating liquid system.
Will ruin the machine in short time!
●
Prior to commissioning, the operating and cooling liquid system must be connected and open.
●
Make sure that the installation conditions (see Installation Conditions) are met.
Before operating the machine:
1. Fill with operating liquid by opening the solenoid valve until the level is at the vacuum pump shaft
center – overflow on separator. Ensure operating liquid control valve is open during this process.
2. Check the operation of all automatic valves before start up.
●
Switch on the machine.
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Make sure that the maximum permissible number of starts does not exceed the recommendation
from the motor manufacturer.
After a few seconds of operation:
●
Turn on/activate the operating (and cooling) liquid system device.
●
Make sure that the operating conditions comply with the Technical Data [
➔
29] or the Operating
Limits.
As soon as the machine is operated under normal operating conditions:
●
Measure the motor current and record it as reference for future maintenance and trouble-
shooting work.
7.1 Preventing Cavitation
NOTICE
Cavitation.
Risk of damage to the machine!
If you hear crackling noise:
●
Control the pressure.
At very low pressures and sufficiently high temperatures the operating liquid can locally transfer in-
to the vapor phase, creating bubbles within the operating liquid. As the pressure rises towards the
outlet slot the bubbles collapse. This process is called cavitation.
In case of bubbles that have been located on surfaces the operating liquid cannot intrude the cavity
left by the bubble equally from all directions. Instead the inflowing liquid hits the surface with high
speed. This causes erosion, which can destroy the machine rapidly. The formation of bubbles also
deteriorates the pump performance. Cavitation is clearly audible by its crackling noise.