1592001530 XC15-35CX EN r1.2 11.04.2017 XC15-35CX 28/40
NOTE: If the pressure exceeds the [SET+0.5*HY1] value and the Digital compressor is not
available (due to the timer delay 2on, 2oF or because of digital input alarm lockout), another
compressor will be started (if available).
16.1.2 Capacity decrement and regulation stop
a. When the pressure goes below the value [SET-0.5*HY1] the Digital compressor will be
controlled in PWM modulation, at the minimum allowable capacity, for the time toF.
b. After expiring the delay toF, the second compressor (if active when oA2=CP2) will be
deactivated and the Digital compressor will keep on working for interval of time doF.
c. After the delay doF expires, the Digital compressor will be stopped.
16.1.3 Digital compressor capacity limitation by using parameters PMi
and PMA
The Digital compressor capacity can be limited both in maximum and minimum value by using
par. PMi e PMA as showed in the following diagram:
- %PMi = HY1 * (PMi / 100)
- %PMA = HY1 * (1- (PMA / 100))
PMi: (in percentage) is used to set the minimum activation time of the Digital compressor
during the tdG cycle period.
ES: with tdG=20sec and PMi=20 the minimum compressor activation will be 4 sec.
NOTE: the minimum activation time for Digital compressor must be set to 2 sec
PMA: (in percentage) is the maximum activation time of the Digital compressor during the tdG
cycle period.
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