Danfoss EKC 223, Руководство пользователя, Страница: 24 / 38

(1)
This menu can only be set when regulation is stopped, i.e. “r12” is set to 0.
(1)
This menu can only be set when regulation is stopped, i.e. “r12” is set to 0.
Thermostat
Table 13: Thermostat
Code Text on network Description
r-- Thermostat
r00 r00 Cutout Temperature setpoint
Regulation is based on the set value plus a displacement, if applicable. The value is set via a push on the SET button.
The set value can be locked or limited to a range with the settings in r02 and r 03.
The reference at any time can be seen in ”u28 Temp. ref”.
r01 r01 Differential Differential
When the temperature is higher than the ref the set differential, the compressor relay will be cut in. It will cut out
again when the temperature comes down to the set reference.
In heating application, heater will cut-in when the temperature reaches cutout - differential.
r02 r02 Max cutout Max. Setpoint limitation
The controller’s setting range for the setpoint may be narrowed down, so that much too high or much too low values are
not set accidentally - with resulting damages.
To avoid a too high setting of the setpoint, the max. allowable reference value must be lowered.
r03 r03 Min cutout Min. Setpoint limitation
The controller’s setting range for the setpoint may be narrowed down, so that much too high or much too low values are
not set accidentally - with resulting damages.
To avoid a too low setting of the setpoint, the min. allowable reference value must be increased.
r04 r04 Disp. Adj. K Correction of the display’s temperature readout
If the temperature at the products and the temperature received by the controller are not identical, an offset adjustment of
the shown display temperature can be carried out.
r05 r05 Temp.unit Temperature unit
Here you set whether the controller display is to show temperature values in °C or in °F.
r09 r09 Adjust Sair Correction of signal from Sair
Compensation possibility through long sensor cable.
r12 r12 Main switch Start / stop of refrigeration
With this setting refrigeration can be started, stopped or a manual override of the outputs can be allowed.
Start / stop of refrigeration can also be accomplished with the external switch function connected to a DI input.
Stopped refrigeration will give a ”Standby alarm”.
• (1) ON : Start
• (0) OFF : Stop
• (-1) SEr : Manual control of outputs allowed
r13 r13 Night offset Night setback value
The thermostat’s reference will be the setpoint plus this value when the controller changes over to night operation. (Select
a negative value if there is to be cold accumulation.)
r40 r40 Th Offset K Thermostat reference displacement
The thermostat reference and the alarm limits are offset with the set value when the displacement is activated. Activation
can take place via input DI1 or DI2 (defined in o02 or o37).
r96 r96 Pulld. dur. Pull-down duration
Maximum duration of the pull-down mode
r97 r97 Pd limit tmp Pull-down limit temperature
A safety feature; the lowest temperature allowed during pull-down. If the set limit is reached, the pulldown is terminated.
--- --- Night setbck Night setback
Master control signal used by network system manager to put the controller into night condition. Only used on Modbus
datacommunication
Alarm settings
Table 14: Alarm settings
Code Text on network Description
A-- Alarm settings The controller can give alarm in different situations. When there is an alarm, the display will indicate the alarm code, and
the alarm relay will cut in.
A03 A03 Alarm delay Alarm delay (short alarm delay)
If one of the two limit values is exceeded, a timer function will commence. The alarm will not become active until the set
time delay has been passed. The time delay is set in minutes.
A12 A12 Pulldown del Pull-down alarm delay (long alarm delay)
This time delay is used during start-up, during defrost, during pull-down. There will be change-over to the normal alarm
time delay “A03” when the temperature falls within the alarm limits.
A13 A13 HighLim Air High alarm limit
Here you set the alarm limit for the high temperature alarm. The limit is set in °C (absolute value). During night condition,
the limit value will be changed with the same value as the night offset. The change will only be applied for positive night
offset.
The limit value will also be changed in connection with reference displacement r39. Regardless, whether this is positive or
negative
Case controller, type EKC 223 and EKC 224
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