104
AHU Kit – Installation Instructions –
11/2021
Control
7
Parameter menu
No.
Parameter
code
Parameter name
Setting
range
Description
1
ALI
Inactive
–
2
HY
Hysteresis
0 ... 50
Switching difference relative to the set value, unilateral (i. e. the value is added
either below (“heating mode”) or above (“cooling mode”) the set value)
3
P
Proportional band (P)
000 ... 999
Proportional action for the PID-controlled system
4
i
Integral time (I)
0 ... 999 s
Integral action for the PID-controlled system
5
d
Derivative time (D)
0 ... 999 s
Derivative action for the PID-controlled system
6
T
Output switching time (T)
1 ... 100
T represents a time value equivalent to the minimum period of time during which the
output maintains in switched status (only active in PID mode).
1
7
SC
Setpoint calibration (SC)
–50 ... +500 °C Sensor calibration (subtracts/adds the set temperature value from/to the actual
value)
8
AT
Auto-Tuning
0 / 1
0 = OFF / 1 = ON
2
9
LOC
Password protection for
access to menu (LOC)
0 ... 999
LOC = 0, changes to menu A and Auto-Tuning allowed
3
LOC = 1, no changes on parametrization level allowed; changes to set values
possible
3
LOC = 2, no changes to any parameters allowed
3
1 With a higher value, the controller will try to maintain the temperature using a lower cycle frequency with a longer cycle
time. In principle, cycle times for mechanical relay outputs should be chosen to be as long as possible, to avoid early
wear and tear by high cycle frequencies.
However, when using Solid State Relay outputs (SSR) short cycle times may result in a temperature curve with en-
hanced linearity, while the cycle frequency has no relevance for the wear-free electronic SSR outputs.
2 AutoTuning must be performed during normal operation with the load applied.
However, during Auto-Tuning mode the system may heat up to temperatures significantly exceeding the set temperature
value. Therefore, for sensitive applications the set value should be reduced before the start of the Auto-Tuning mode.
Auto-Tuning is terminated automatically (after max. 9 hours) or aborted prematurely if the following conditions occur:
●
Set temperature value is changed
●
Actual temperature takes on an abnormal value (out of limits)
● Controller is switched off or power supply is interrupted for at least 20 ms
●
Maximum Auto-Tuning duration of 9 hours is exceeded.
3
Blocked parameters can be changed, but changed values cannot be confirmed.
Switching from PID mode to ON/OFF mode
1. To switch from PID mode to ON/OFF mode, the P, I and D parameters (menu items 3 through
5) must be set to the value “0” (zero). For detailed steps see →
7.2.2 Thermostat – Operation –
Changing values in the “Parameter” menu, p. 103
2. During ON/OFF mode, if the PID parameter values (menu items 3 through 5) are changed
manually or if Auto-Tuning (menu item 8) is activated, PID mode is automatically re-activated.
Auto-Tuning in PID mode
The Auto-Tuning function of the thermostat can automatically determine optimum PID settings for
certain load conditions.
To use Auto-Tuning, the following requirements must be met:
●
Controller is switched on.
●
Load is applied.
●
Set temperature value is set to a value which is
a. as close to the real set temperature as possible
b. low enough to avoid damage to the system caused by excessively high
temperatures.
●
LOC parameter (menu item 9) is set to “0” (zero).
Summary of Contents for PAW-280PAH3M-1
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