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voS
Speed variation when temperature increases: (0 to 100 Hz/min)
vo2
Speed variation when temperature decreases: (0 to 100 Hz/min)
t1n
Interval of time with speed fixed to Pmi after start-up: (0 to 999 min)
t1F
Interval of time with speed fixed to Pmi before stopping regulation: (0 to 999 min)
tC2
Interval of time to control temperature deadlocks: (1 to 255 min)
SPi
Speed in case of probe error: (Pmi to PMA)
The value of the par HY1 can normally be set to the same value of par. HY. In this way, the
regulation band will be extended from SET to SET+HY+HY1. The device will activate the regulation
when the measured temperature will go over the SET+HY value and will stop the regulation when the
temperature will reach the SET value. When the regulation is running, the frequency output, and then
the compressor speed, will be calculated in proportional way by using the Pmi...PMA band. After
reaching the SET+HY value, the controller will start increasing the frequency output, and then the
equivalent compressor speed, by using the par. voS. The speed increasing will be stopped as soon
as the proportional calculated value (for the compressor speed) hooks the requested value. In case
of temperature decrement and compressor speed higher than the new requested value, the controller
will decrease the compressor speed proportionally by using the vo2 value.
At start-up and after reaching the SET value, it is possible to force the compressor speed to Pmi for
two different intervals of time defined from par. t1n and t1F.
I case of regulation probe error, the compressor speed will be set to the value of par. Spi.
4.3 TEMPERATURE DEADLOCK CONTROL
The controller is able to detect temperature deadlocks. If the actual speed is not able to reach the
SETPOINT, and if this condition lasts more than the tC2 interval of time, then the controller will
increment the actual speed of a fixed value of 10%. The new compressor speed will stay unchanged
till reaching the SETPOINT or until another interval of time equal to tC2 will expire.
4.4 HOT GAS DEFROST
In case of using hot-gas defrost, it will be possible to set the compressor speed by using par. Aod.
5. PULL DOWN
An automatic function named PULL DOWN is implemented. This function forces the controller to
work at PMA until reaching a specific SETPOINT (par. CCS) for a maximum interval of time (par.
CCt). The PULL DOWN function is activated:
At start-up if the temperature measured from the regulation probe is higher than the
-
SETPOINT
-
After any defrost
If the temperature measured from regulation probe go over the SET+HY+HY1+oHt value.
-
If one of the above conditions happens, the controller will maintain the maximum compressor speed
(PMA) until reaching the CCS setpoint. The maximum interval of time for any PULLDOWN is defined
from par. CCt. At the end of any PULL DOWN it is possible to set a couple of intervals (par. tAP) with
predefined compressor speed (par. tP1 and tP2).
6. FRONT PANEL COMMANDS
To display target set point; in programming mode it selects a parameter or confirm
an operation.
(DEF) To start a manual defrost.
(UP) To see the used parameter map. When in programming mode, it browses
the parameter codes or increases the displayed value.
(DOWN) To see the used parameter map. When in programming mode, it
browses the parameter codes or decreases the displayed value.
To switch the instrument on and off (when onF=oFF).
To switch on and off the light (when oAx=LiG).
KEY COMBINATIONS:
RNC-2014-034 XRi77CX GB r1.0 07.03.2014.docx
+
To lock & unlock the keyboard.
+
To enter in programming mode.
+
To return to the room temperature display.
6.1 USE OF LEDS
Each LED function is described in the following table.
LED
MODE FUNCTION
ON
Compressor enabled
Flashing Anti-short cycle delay enabled
ON
Defrost enabled
Flashing Drip time in progress
ON
Fans enabled
Flashing Fans delay after defrost in progress.
ON
An alarm is occurring
ON
A PULL DOWN is running
ON
Energy saving enabled
ON
Light on
ON
Auxiliary relay on
ON
Measurement unit
,
Flashing Programming phase
7. MAX & MIN TEMPERATURE MEMORIZATION
7.1 HOW TO: SEE THE MIN TEMPERATURE
1.
Press and release the DOWN button.
2.
The "Lo" message will be displayed followed by the minimum temperature recorded.
3.
By pressing the DOWN button again or waiting for 5 sec the normal display will be restored.
7.2 HOW TO: SEE THE MAX TEMPERATURE
1.
Press and release the UP button.
2.
The "Hi" message will be displayed followed by the maximum temperature recorded.
3.
By pressing the UP button again or waiting for 5 sec the normal display will be restored.
7.3 HOW TO: RESET THE MAX AND MIN TEMPERATURE RECORDED
1.
Keep SET button pressed for more than 3 sec while the max or min temperature is displayed.
("rSt" message will be displayed)
2.
After confirming the operation, the "rSt" message will start blinking and then the normal
temperature will be displayed.
8. MAIN FUNCTIONS
8.1 TO SET THE CURRENT TIME AND DAY (ONLY WITH RTC)
When the instrument is switched on, it's necessary to program the time and day.
1.
Enter the Pr1 programming menu, by pushing the SET+DOWN keys for 3 sec.
2.
The rtC parameter is displayed. Push the SET key to enter the real time clock menu.
3.
The Hur (hour) parameter is displayed.
4.
Push the SET and set current hour by the UP and DOWN keys, then push SET to
confirm the value.
5.
Repeat the same operations with Min (minutes) and dAy (day) parameters.
To exit: Push both SET+UP keys or wait for 15 sec without pushing any keys.
8.2 HOW TO: SEE THE SET POINT
1.
Push and immediately release the SET key: the display will show the
Set point value;
2.
Push and immediately release the SET key or wait for 5 sec to display
the probe value again.
8.3 HOW TO: CHANGE THE SET POINT
1.
Push the SET button for more than 2 sec to change the Set point value.
2.
The value of the set point will be displayed and the °C or °F LED will start blinking.
3.
To change the actual value, push the UP or DOWN buttons within 10 sec.
4.
To memorise the new set point value, push the SET button again or wait for 10 sec.
8.4 HOW TO: START A MANUAL DEFROST
Push the DEF button for more than 2 sec and a manual defrost will start.
8.5 HOW TO: CHANGE A PARAMETER VALUE
To change a parameter value, operate as follows:
1. Enter the Programming mode by pressing the SET+DOWN buttons for 3 sec (the °C or °F LED
will start blinking).
2. Select the required parameter. Press the SET button to display its actual value.
3. Use UP or DOWN buttons to change its value.
4. Press SET button to store the new value and move to the following parameter.
To exit: press SET+UP buttons or wait for 15 sec without pressing any key.
NOTE: the set value is stored even when the procedure exits by waiting for the time-out to expire.
8.6 THE HIDDEN MENU
The hidden menu includes all the parameters of the instrument.
XR77CX
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