6 | Commissioning
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6.1 Pump Down Cycle
Below the graph and the procedure to operate the machine for a pump down cycle.
90
60
40
30
Open isolation valve
Close isolation valve
1 cycle
Time
Hz
Backing pump
Booster
• The machine must operate at a motor frequency of 30 Hz when opening the isolation
valve.
• Gradually increase the motor frequency up to 90 Hz.
• As soon as the target pressure is reached, close the isolation and decrease the motor
frequency to 30 Hz.
6.2 Compression Chamber Flushing
Depending on the process type (very demanding application), flushing through the com-
pression chamber (cy lobes) might need to be performed. Seek advice from your
Busch representative.
NOTICE
Flushing without barrier gas.
Risk of damage to the machine!
• The flushing process can pass over into the bearings and the oil chambers!
Do not perform flushing without using the barrier gas.
Beforehand, a barrier gas must be connected according to the following illustration and
recommendations: