Handbook Ucontrol type-lines PXDM Date 06/04
TBL02_55-GB06/04 Part.-No. 00153239-GB
Page 77 / 105
9.7 Second Group „indirectly controlled“ or „100 %-energized“
Along with the fans directly controlled by the device, additional fans can be „indirectly“ controlled or set to
„100 % energized“.
Second group „indirectly controlled“
Analog output „Analog OUT 1“ in IO Setup function 5 A
= group control is programmed.
This output is employed as the default signal for a speed controller.
If the default signal or the regulation deviation exceeds the group 2 switch-on point, group 1 is
reduced to „n-min group 2”. Starting here, both groups run parallel at maximum power.
Second group „100 % energized“
Relay output (K1 or K2) in IO Setup function 8 K
= group control is programmed.
A contactor is triggered via this relay contact, which directly switches the fans of the second group
to mains voltage.
If the default signal or the regulation deviation exceeds the „Group 2 ON value“ switch-on point, the
relay for the second group switches on and the speed of the first group is lowered to an adjustable
minimum value. After that, the speed of the first group increases back up to maximum.
Example: Second Group „indirectly controlled“ ON value group 2 = 50 %, n-min at group 2 = 20 %
Example: Second group „100 % energized“ ON value group 2 = 50 %, n-min at group 2 = 20 %
n-min group 1
at switch on group2
Idealized principle diagram
0 50 % 100 %
Speed controller: setting signal
Setpoint ← Pband →
P-Controller: control deviation
group 1
100 %
50 %
group 2
Signal / Sensor
3~ 0-400 V
Ucontrol
3~ 400 V
ON / OFF
3~ 400 V
contactor
3~ 400 V
Group 2
Group 1
Signal / Sensor
3~ 0-400 V
Ucontrol
3~ 400 V
Signal 0-10 V
3~ 0-400 V
Ucontrol
3~ 400 V
n-min
rou
2
Idealized principle diagram
100 % / 10 V
50 % / 5V
modulation / 0-10 V Signal
0 50 % 100 % Speed controller :setting signal
Setpoint ← Pband →
P-controller: control deviation
0-10 V Signal group 2
modulation group 1
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