Karcher HD 7-250 De Tr1 - Manual (Page 61)

Produkt.pm6.5 - GB
Page 2.5
Product description
BOGE Operating instructions for CM 9 series screw compressor module
Network pressure
Operating states
Short operating
times
For the compressor, the pressure downstream of the check valve is termed
network pressure. The control system switches the compressor on and off
during operation depending on the network pressure.
All screw compressor controls are based on three basic operating states:
1. Load operation (energized solenoid valve/motor is on)
– The compressor delivers its maximum amount of compressed air.
– It consumes its maximum energy.
2. Idling operation (de-energized solenoid valve/motor is on)
– The compressor runs but does not deliver any compressed air.
– It consumes approx. 75% less energy than in load operation.
– When compressed air is required, it switches to load operation with-
out delay.
– Idling operation reduces switching frequencies which can damage the
drive motor, and reduces wear of the system.
3. Standstill ready for operation (de-energized solenoid valve/motor in
standstill)
– The compressor is standing still but ready for operation.
– When compressed air is required, it switches automatically to load
operation.
ATTENTION!
During short operating times, the compressor does not reach its operating
temperature. It operates below the dew point. The generated condensate
mixes with the oil. The lubricating ability of the oil is reduced. This leads to
damage on the air end.
It is of utmost importance to consult BOGE, if you operate your system with
short operating times.
2.3 Compressor control