Daikin EWYD330BZSL handleiding
Handleiding
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6.5. Compressors capacity control
Two types of capacity control are implemented:
• Automatic: the compressor start/stop and its capacity are automatically managed by the
software to allow the setpoint respect
• Manual: the compressor is started by the operator and its capacity is managed by the operator
acting on the system terminal. In this case the compressor will not be used by the software to
allow the setpoint respect.
Manual control is automatically switched to Automatic control if any safety action is
required on the compressor (safety standby or unloading or safety shutdown). If this case the
compressor remains in Automatic and must be re-switched to Manual by the operator if required.
Compressors in manual mode are automatically switched in automatic mode at their
shutdown.
The compressor load by may be evaluated on the basis of:
• Calculation of loading and unloading pulses
• Analogic slide valve position signal (optional)
6.5.1. Automatic Control
A specialized PID algorithm is used to determinate the magnitude of corrective action on
capacity control solenoid.
The compressor loading or unloading is obtained keeping the loading or unloading solenoid
energized for a fixed time (pulse duration), while the time interval between two subsequent pulses
are evaluated by a PD controller (see fig. 11).
If the output of the PD algorithm doesn’t change, the time interval among pulses is
constant; this is the integral effect of the controller, at a constant error the action is repeated with a
constant time (with the additional feature of a variable integral time).
The compressor load evaluation (based on analog slide valve position or calculation
1
) is
used to allow the start of another computer or the stop of a running one.
It is required to define the proportional band and the derivative time of the PD control,
together with the pulse duration and a minimum and maximum value for pulses interval.
The minimum pulse interval is applied when the maximum correction action is required,
while the maximum interval is applied when the minimum correction action is required.
1
The calculation is based on the load increase (or decrease) associated to each pulse:
pulseloadn
pulseperIncLoad
25100
(%)
−
=
pulseunloadn
pulseperDecLoad
25100
(%)
−
=
Being “n load pulses” and “n unload pulses” the number of pulses to load and unload the compressor.
Counting the number of pulses given to the compressor its load is evaluated.
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Productinformatie
| Merk | Daikin |
| Model | EWYD330BZSL |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10110 MB |
