VDH PROBA 50, Руководство пользователя

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VDH Products BV Document 951573 - Version 1.3 Blad: 5 of 26
1.3 Method of temperature control
Up to four temperature sensors can be connected to the PROBA 50 .
It makes use of three product sensors which are placed in the boxes with the bananas (pulp temperature). These are
the product sensors type
SM8500 which are connected via the coiled leads to the connection boxes. The
temperature is controlled on the average of the present and active product sensors.
In addition, an air temperature alarm sensor, type SM8000/2m , can be connected. This sensor controls the minimum
and maximum temperature of the airflow coming out of the evaporator. The evaporator can be temporarily switched
off if the alarm levels are exceeded.
Via a setting in the internal parameters the method of control can be selected, at which product sensor 3 is replaced
by an air temperature sensor type
SM800/2m . During the warming-up phase (day 0) the temperature is controlled by
sensor 3. When the warming-up phase is passed, the temperature is controlled on the average of sensor 1 and 2.
2 The PROBA 50
2.1 Control of the PROBA 50
The control computer PROBA 50 can be controlled fully via its front panel and has a number of control and display
features:
* Push buttons,
* Displays,
* LED's.
The control can be distinguished in:
* Readout of the sensor values,
* Change of setpoint(s),
* Programming and starting of regulation,
* Programming of control parameters and alarms.
Function of the LED's:
M 1 Indicates if sensor 1 is active. Flashes if sensor 1 is read-out.
M 2 Indicates if sensor 2 is active. Flashes if sensor 2 is read-out.
M 3 Indicates if sensor 3 is active. Flashes if sensor 3 is read-out.
M 4 Indicates if sensor 4 is active. Flashes if sensor 4 is read-out.
ALARM Lights in case of an error.
COOL Displays if the cooling is switched on.
HEAT Displays if the heating is switched on.
GAS Lights constantly if gas flows into the ripening room. Flashes if gas is present in the
ripening room.
VENT Lights during ventilation of the ripening room.
In general a flashing LED means that a function is active.
2.1.1 Switching the PROBA 50 ON and OFF
By pressing the ON/OFF key the PROBA 50 is switched on or off.
If the PROBA 50 is switched off, the control will stop immediately.
If the PROBA 50 is switched on, all settings can be displayed.
To change settings, a 4-digit security has to be entered.
Press the KEY button. The display shows the text 'Code'. By use of
combination of keys on the bottom row a code can be entered.
If the code is correct, the LED above the KEY button will light and settings can
be changed. The lock is open.
By pressing the KEY button again, the LED above the KEY button will
extinguish and it is not possoble to change the settings. The lock is closed.