Dual Control - KAESER SK 19 Service Manual

5.4

DUAL Control

p
max
p
min
Full load
Idle
Standstill
In DUAL Control (combined idle and start ---stop) the compressor normally runs at full --
load, idle or standstill.
The controller regulates the compressor package between full -- load and idle.
If the compressor package runs in idle for longer than the preset period (1) to (2), for
example t = 6 min, the drive motor is stopped completely (2). When the lower switching
1
point p (3) is reached the compressor package is automatically started again. Pressure
min
rises to the upper switching point p
the pressure falls again to, for example, p
compressor is automatically switched from idle to full---load.
The idle period is dependent on the maximum motor starting frequency.
Construction and Operation
1 2 3 4 5
t1 t2
(4), and the compressor package switches to idle. If
max
(5) within a shorter period (4) to (5), then the
min
Time
5 --- 17