BOGE Operating instructions for C 16 N...C 30 N, C 16 F N...C 30 F N series screw compressors
Page 21
Product description
2.5
Compressor control
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.
Operating modes
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 com-
pressor 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.
Control of compressors
with frequency control
(C F N)
When the operating pressure p
soll
(target value) is exceeded the control
becomes active and reduces the speed.
When the operating pressure p
soll
(target value) is dropped below the control
becomes active and increases the speed.
The settings for p
min
, p
max
and p
soll
(target value) are made by parameterization
of the FOCUS control.
The standard settings are:
p
max
– 4 psig = p
soll
p
max
– 6 psig = p
min
Short operating times
WARNING!
During short operating times, the compressor does not reach its operating
temperature. It operates below the dew point. The condensate generated
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.
