Daikin EWYD360BZSL handleiding
Handleiding
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A dead band is introduced to allow to reach a stable compressor condition.
Fig. 12 shows the proportional action of the controller as a function of the input parameters.
The proportional gain of the PD controller is given by:
2
RegBand
Max ⋅=
p
K
The derivative gain of the PD controller is equal to:
dpd
TKK ⋅=
where
T
d
is the input derivative time.
In addition to the specialized PID controller, a max pull-down-rate is introduced in the
control; this meanings that if the controlled temperature is approaching the setpoint with a rate
greater than a set value, any loading action is inhibited, even if require by the PID algorithm. This
makes the control slower but allows to avoid oscillations around setpoint.
The controller is designed to act both as a “chiller” and as a “heat pump”; when the “chiller”
option is selected the controller will load the compressor if the measured temperature is above the
setpoint and will unload the compressor if the measured temperature is below the setpoint.
When the “heat pump” option is selected the controller will load the compressor if the
measured temperature is below the setpoint and will unload the compressor if the measured
temperature is above the setpoint.
The starting sequence of compressors is selected on the base of lower working hours amount
(it means that the first compressor that is started is the one with the lower amount of working hour);
between two compressors with the same operating hours, the compressor with minimum number of
starts will start first.
A manual sequencing of compressors is possible.
The start of the first compressor is allowed only if the absolute value of difference between
the measured temperature and the setpoint exceeds a Startup
∆
T value.
The stop of the last compressor is allowed only if the absolute value of the difference
between the measured temperature and the setpoint exceeds a Shutdown
∆
T value.
A FILO (First In - Last Off) logic is adopted.
The start/loading and unloading/stop sequence will follow the schemes in table 2 and table
3, where RDT is the Reload/Reunload
∆
T, a set value (that represent the minimum difference
between the evaporator leaving water temperature and its setpoint) that will a running compressor
to be reload when a compressor is shutdown or a running compressor to be unload when a new
compressor is started.
This is made to keep the unit total capacity at the same level when the evaporator leaving
water temperature is close to the setpoint and a compressor stops, or another compressor starts, is
required.
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Productinformatie
| Merk | Daikin |
| Model | EWYD360BZSL |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10110 MB |
