ZIEHL-ABEGG DControl PKDT Series - Adjusting Control Range via Potentiometer Pband; Min. Speed n-min (Minimum Output Voltage); Max. Speed n-max (Derating) and Cos φ-Adjustment

Operating instructions Dcontrol Date 0730
TBL02_54-GB 0730 Part-No. 00153238-GB
Page 18 / 28
7.2.2 Adjusting the control range via potentiometer “Pband”
The control response can be adjusted to the system conditions with this setting
- small control range = greater amplification and shorter control times
- big control range = longer control times and higher controller stability
♦ At active sensors with 0-10 V or 4-20 mA (factory setting)
5-30 % ^
5-30 % of measuring range of the sensor
Setting range:
E.g., pressure control with PKDM:
Pressure sensor, type MBG-30I (0-30 bar, measuring range 30 bar)
Setting 10 % ^
3 bar
♦ At passive temperature sensor TF.. (KTY10-6)
- PKDT5 5-30 % ^
4 ... 24 K (5-30 % of device´s measuring range 0-80° C)
- PKDM 5-30 % ^
5 ... 30 K (5-30 % of device´s measuring range -25 ... +75° C)
7.2.3 Min. speed „n-min“ (minimum output voltage or basic speed)
If required setting of a minimum output voltage, e. g. basic speed (minimum airflow rate) of connected fans.
Setting range:
From the counter-clockwise limit = “0“ (no “n-min“) to 15-100 % (^
approximately the mains voltage applied).
7.2.4 Max. speed „n-max“ (derating) and Cos φ-adjustment
If required setting of a maximum output voltage, e. g. speed limiter.
Setting range:
From the clockwise limit (100 %) to 20 % (^
approx. 100 % -20 % of the applied mains voltage).
For a given minimum output voltage to the setting “n-min“. For cos ϕ adjustment, turn “n-max“ counter-
clockwise such that the maximum output voltage will just be measured (with TRUE-RMS multimeter). This
adjustment must be made for maximum output from the fans. All flaps must be opened when using
centrifugal fans.
Cos ϕ adjustment
The output voltage from the unit depends on the inductance of the motor (cos ϕ). By this, the
maximum output voltage can already be reached below the maximum input signal
(<10 V / 20 mA). A correction is possible by setting “n-max" (cos ϕ adjustment).
Pband
5 30
%
16 20 24
Temperature
[K]
4
812
Pband
[%]
5
10 15 20 25 30
30
30
15 20 25
5
10 15 20 25
Pband
[%]
Temperature
[K]
5
10
n-min
0 100
%
n-max
0 100
%