DK-40 USER MANUAL V2.6 (02.08.2011)
K13D01-E - 19 -
6.5. PREVENTING PRESSURE LOSS
If the pressure stays above the P05 Start Pressure, during P26 Unload Timer then
the unit will stop the motor. If the pressure falls below P05 Start Pressure then the motor
will run again.
Before the compressor is loaded, a timer equal to P23+P24+P25+P15x3 will be
elapsed.
During this period, depending on the air consumption, the pressure may fall below
P05 Start Pressure.
In most applications, it is required that the pressure never falls below the P05 Start
Pressure limit.
In order to prevent this unwanted situation, the unit offers 3 different operating
modes selected through program parameter P45. The unit calculates dynamically the
restart pressure (Pi)
P45 = 0 No special care taken. Pi = P05.
P45 = 1 When the compressor is loaded, if the pressure is below P05 Start Pressure,
then the Restart Pressure (Pi) is incremented by 0.1 bar.
When the compressor is loaded, if the pressure is above P05 Start Pressure, then the
Restart Pressure (Pi) is decremented by 0.1 bar. Thus the unit tries to load at exactly P05
Start Pressure.
P45 = 2
When the compressor reaches P04 Stop Pressure, the unit measures the air
consumption during 8 seconds, then calculates the Restart Pressure (Pi) again.
At the end of P26 Unload Timer, if the pressure is above
P05 Start Pressure and below Pi Restart Pressure, then the
motor will continue to run unloaded.
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Power
Measurement Inputs
