CompAir 5280D.1.IAC, Руководство оператора

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App 408 Customer PET controller installation guide & user's manual
Page 10
App 408C 98155.1015
2.2.5 Machine configuration Code 11
In the machine configuration menu, the following application specific parameters can be set:
Parameter Function Default Min. Max.
Control CNT - Continuous : the compressor motor runs
continuously from the start command until the stop
command. The unloaders will be controlled by the
measured pressure and the programmed load and
unload levels.
AUT - Automatic: this operation mode is essentially
the same as the continuous control but with the
addition of a run on timer. If the compressor runs
unloaded for a specified time( programmed in ‘run on
timer’) then the motor will stop until the pressure drops
below the programmed load level, when it will
automatically restart AUT AUT CNT
Run on timer The amount of time the motor keeps on running with
the compressor in the unloaded mode before it stops. 10m 10m 20m
Auto restart Automatic restart of the machine after a power failure
if the compressor was running before it occurred. The
compressor will restart after the blowdown time
setting. For multi m/c installations vary blowdown
setting times by 5 seconds to stagger starts OFF AUT OFF
Start control Selection between local start / stop control or remote
start / stop control through a digital input. ( Switch
poweroff /on or operate remote to activate) LOC LOC REM
Press. Ctrl. Selection between local load / unload control or
remote load / unload control through a digital input. (In
remote, unload will unload compressor and load will
give normal control by system pressure) LOC LOC REM
Machine nr Address of the controller in an RS485 network.. 1 1 20
Table 7
Important note: It is always possible to stop the machine locally when remote start / stop function is
enabled.
2.2.6 Regulating settings Code 11
While the compressor is running loaded, the variation in rate of rise and fall of pressure will be used to
control the full load solenoid valve. If the pressure still rises in the ½ load condition it will rise until it reaches
the unload level. The compressor will then work off load until the pressure falls to the load level again.
Parameter Function Default Min. Max.
P factor This proportional control factor determines how much
the control will react to momentary differences between
actual and target pressure. (equivalent to inverse
damping) 40% 0% 100%
I factor This integral control factor determines how much the
control will react to accumulated differences (over time)
between actual and target pressure. ( equivalent to
hysteresis or deadband) 10% 0% 100%
Table 8
The setting of the above factors will depend upon the number of compressors, the size of the air receivers
and on the change in demand for air. For best results the P factor should be 3 –5 times the I factor.
Generally if there is a large pressure swing and the compressor reacts too late then reduce I factor and if
the compressor changes load condition rapidly with small changes in pressure then reduce P factor.