Handbook
Ucontrol
type-lines PXDM
Date 06/04
TBL02_55-GB06/04
Part.-No. 00153239-GB
Page 76 / 105
9.6 Minimum speed cut off (operation without minimum air reate)
This function is primarily significant for installation of the device as a pure P Controller
in refrigeration and air-conditioning technology.
For operation mode speed controller
1.01
without function !
When the setpoint is reached, the modulation is reduced to “0“ %, or to the set value if “Min. Speed“ is specified.
When minimum air shutdown is
inactive
Msco = OFF (
factory setting
) there is no disconnection, i.e. minimum
ventilation is always assured (fan does not go below “Min. speed“).
If minimum air shutdown is
active
,“Min. Speed“ is disconnected to “0“.
The point of switching off is related to the active desired value (
±
adjustable).
Example : Temperature control in factory setting „Cooling“
For Control function actual value>Set= n+ ON (COOLING: increasing output voltage at increasing actual value).
The cut-off takes place for a set value with a ”
+
” before the Setpoint is reached, for a set value with a ”
-
” sign, this occurs
when the actual value is below setpoint.
For Control function actual value>Set= n+ OFF (HEATING: increasing output voltage at decreasing actual value).
The cut-off takes place for a set value with a ”-” sign after the Setpoint is reached. For a set value with a ”+” sign, this
occurs already before the Setpoint is reached.
Hysteresis for temperature regulation about 1K, for other sensor inputs about 2 % (sensor measuring range).
↓
↑
4
↓
P
↑
ESC
Min. speed
Setting for
M
inimum
s
peed
c
ut
o
ff – 2.0 K
100 %
50 %
U Motor
Actual value
n-min = 35 % n-max = 100 %
20 °C
Setpoint
Pband 10 K
Idealized principle diagram
Summary of Contents for Ucontrol PXDM Series
Page 80: ...Handbook Ucontrol type lines PXDM Date 06 04 TBL02_55 GB06 04 Part No 00153239 GB Page 80 105 ...
Page 92: ...Handbook Ucontrol type lines PXDM Date 06 04 TBL02_55 GB06 04 Part No 00153239 GB Page 92 105 ...
Page 96: ...Handbook Ucontrol type lines PXDM Date 06 04 TBL02_55 GB06 04 Part No 00153239 GB Page 96 105 ...
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