Danfoss Electronic Temperature Controller - AHT ATHEN 175 Manual Del Usuario

AHT Cooling Systems GmbH
Before allocating addresses, the cabinets must be connected
with a 6-core cable (bus cable). The last participant must be
fitted with a terminating resistor. We recommend entering the
addresses following the actual sequence in which the cabinets
are wired up.
Address 01 is mandatory, because this address acts as
master for energy management with the remaining AHT
controllers.
Procedure for assigning addresses:
1) Hold down the + and – buttons simultaneously for at
least 5 seconds.
2)
Adr. will appear in the display (for approx. 0.5s),
alternating with the current bus address, e.g. 00 (for 2s).
3) By pressing the + button (for at least 0.5s), you can
assign the next free address on the bus. If you were to
press the button once and assign the first address, 01
would appear in the display. If you assign too high a
number for the address, you can reduce the current
address, e.g. from 02 to 01, by holding down the –
button (for at least 0.5s).
4) After 10s, the value is adopted and the unit reverts to the
actual value.
5) Assign the addresses for the remaining cabinets using
the same procedure as in steps 1 - 4, remembering
always to select the next free address, e.g. 02.
Responding to and acknowledging the alarm:
If an error occurs, the 7-segment display shows one of the
following messages. After an error occurs, the actual value
flashes alternating with the error message. In the event of
excess temperature, only the actual value flashes. After a few
minutes, only a dot continues to flash below the actual value.
After each full hour that passes, the current error message is
displayed again. A list of error messages is shown in the lines.
Actual value/Bus
Actual value/Col.
Actual value/F1
Actual value/F2.
Actual value/F3
Actual value/d.Fr/F3 Defrosting system error
Actual value/d.Fr/F3 Defrosting system error
Actual value/Time
Actual value/EE
Actual value flashing Excess temperature alarm
Once a malfunction has been corrected, the error message
will automatically disappear. You can acknowledge an error
message by switching the unit off and on using the STANDBY
button (see 'Switching control system on and off'). If the error
is still active, the current error message will reappear.
8.4 DANFOSS Electronic Temperature
Controller
The DANFOSS Electronic Temperature Controller is designed
for single loop and feedback control of AHT refrigeration and
freezer units. The controller can be used for stand-alone
operation or for cabinets on a bus network.
Bus error, missing address
Address collision,
Sensor malfunction, F1
Sensor malfunction, F2
Sensor error, F3
Time/date invalid
Data fault
Before starting up the cabinet, carry out another check of all
cable connections and the power supply to make sure they
are correct and make good contact.
Operation
The unit starts working automatically once connected up to
the power supply. In normal operating mode, the average
interior temperature inside the unit is shown in °C.
If you press the "Standby / Reset" button for at least 1 second
the unit will switch to standby mode. The display shows: "- - -".
If you press the "Standby / Reset" button once more the unit
will switch on again and the unit's internal temperature will be
displayed. This procedure may take a few seconds.
+/- button... To select the temperature range (parameter) and
assign addresses.
MAN. DEFROST button... inactive
STANDBY/RESET button Master switch for switching to
standby mode (from normal mode) and for acknowledging the
alarm (if the alarm is active).
Setting the nominal value
To select the temperature range within which the unit should
operate, use the following parameters.
Parameter Function Nominal temperature at idling
A1 Deep freeze (nominal value 1) -18°C
A2 Deep freeze (nominal value 2) -20°C
A3 Meat refrigeration
A4 Chilling
There is no need to set a temperatures, just a control range:
A1, A2, A3 or A4.
The various control ranges can be blocked or approved
depending on the customer's requirements.
20
+/- button
STANDBY/RESET button
+1°C
+4°C