1592001530 XC15-35CX EN r1.2 11.04.2017 XC15-35CX 27/40
16. REGULATORS
16.1 DIGITAL COMPRESSOR REGULATION
Set par. oA1 and oA3 as below indicated to manage Digital (Scroll or Stream D4D)
compressors:
- oA1=dGt or d4d
- oA3=dGt or d4d
The cooling demand acts on the Digital compressor that, unless of alarms, delays or par.
FrC=n, is the first to be activated and the last to be deactivated. If Digital compressor is not
available and the pressure is over the upper band, then the second compressor will start (if
oA2=CP2).
The Digital compressor works by modulating the available power in the HY1 regulation band.
16.1.1 How Digital Regulation works
a. The regulation starts when the pressure/temperature on the suction line increases and
reaches the value [SET-0.5*HY1]. If available, the compressor will be activated and
controlled by Digital modulation (PWM output TRIAC, set as oA3=DGS, d4d).
NOTE: after start-up the digital valve is energized for SUt seconds to ensure the
discharge of any liquid present in the compressor.
a. Within the range [SET-0.5*HY1 to SET+0.5*HY1] the Digital compressor is controlled
by PWM according to the value of the control variable. NOTE: when the TRIAC is ON
the compressor is unloaded. When the TRIAC is OFF, the compressor is operating.
b. When the pressure is greater than [SET+0.5*HY1] value and the TRIAC output is
already at the maximum, another compressor can be activated (if oA2=CP2) after
expirating the delay ton.
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