KKT chillers nBoxX 1.5, Operating Instruction, Page: 25 / 48

25 / 48 83000902.Ka
No. No. No. No. Parameter Parameter Parameter Parameter Min. value Min. value Min. value Min. value Max. value Max. value Max. value Max. value Factory Factory Factory Factory setting setting setting setting Setting Setting Setting Setting Explanation Explanation Explanation Explanation
13 Control mode Ct Ft Ft
Ct: Combined control
Ft: Fixed value control
14
Heater function antifreeze
(optional)
OFF ON OFF
Optional if a heater is installed.
ON: +2°C OFF: +5°C
15 Hot gas bypass (optional) OFF ON OFF
OFF: Bypass control unused
ON: Bypass control activated
When P15 is activated, the switching
hysteresis (P2 and P6) is deactivated.
The PID controller will automatically
aim for optimum switching hysteresis.
This is dependent on the PID setting.
The P, I and D values, cycle time and
switching hysteresis of the controller
are each set in turn.
Range (default):
Proportional band P
0.1 .. 99.9 K (1.0)
Integral time (reset time) I
1 .. 999 sec, 0=inactive (300)
Derivative time D
1 .. 999 sec, 0=inactive (50)
Cycle time C
4 .. 100 sec (10)
Note
Analyse to optimise the controlled
system and contact customer service.
16
Set point for filter mat
monitoring
4.0 K
70.0 K
(+ OFF)
OFF
Make the setting as follows (setting
range 4.0 .. 70.0 K, switching differ-
ence 2.0 K, fixed setting): Activate the
cooling unit with a clean filter mat
inserted.
Using the keys and set the
value approx. 10.0 Kelvin above the
difference between temperature probe
B3 and B4.
17 Changeover °C/°F °C °F °C
°C: Show temperatures in Celsius
°F: Show temperatures in Fahrenheit
18
Evaluation of the external
enable signal
1
5
(+ OFF)
OFF
OFF: Normal operation
1: Standby with signal absent
2: Cooling off with signal absent
3: Control via external controller
4: If signal is present at ext. input, the
clock function is deactivated
5: Standby with signal absent. If the
system is on standby, the alarm re-
lay 1 (contact 4-5) opens