Boge SF 220 User Manual

Produkt.pm6.5 - USA
Page 2.9
Product description
BOGE Operating instructions for S 40-2...S 341 / SF 40-2...SF 220 series screw compressors
Supply pressure
Operating states
Operating modes
Short operating
times
For the compressor, the pressure downstream of the check valve is termed
the supply pressure. The control system switches the compressor on and off
during operation depending on the supply pressure.
All screw compressor controls are based on three basic operating states:
1. Load operation
– The compressor delivers its maximum amount of compressed air.
– It consumes its maximum energy.
2. Idling operation
– 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
– The compressor is standing still but ready for operation.
– When compressed air is required, it switches automatically to load
operation.
The two most important operating modes are achieved by combining the
three operating states:
1. Intermittent operation
In intermittent operation the energy balance is perfect.
– The compressor operates in load operation.
– Upon reaching the switch-off pressure p
max
the compressor switches
to standstill. It does not consume any energy.
– Once the pressure has dropped to the switch-on pressure p
min
the
compressor switches back to load operation.
2. Continuous operation
Continuous operation limits the drive motor switching cycles and reduces
wear to the system.
– The compressor operates in load operation.
– Upon reaching the switch-off pressure p
max
the compressor switches
to idling operation.
– Once the pressure has dropped to the switch-on pressure p
min
the
compressor switches from idling operation back to load operation.
CAUTION!
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

Boge SF 220 Specifications

General

Brand	Boge
Model	SF 220
Category	Compressor
Language	English