9.9.12
Selection ampli
fi
er (comparator) control circuit 1 or 2 at output U, V, W
Controller Setup
If using two control circuits, the control circuit with the higher modulation can be
selected to affect the power component of the device.
This function can be used for refrigeration systems with combined refrigerant circuit
and
fl
oating brine pressure control circuits, for example.
Example:
•
Control circuit 1 is used for the refrigerant circuit. A pressure sensor is connected to
determine the actual value. The setpoint and control range are set in bar.
•
Control circuit 2 is used for the brine pressurised circuit. A temperature sensor is
connected to determine the actual value. The setpoint and control range are set in
C
°
/ K.
•
Depending on which control circuit produces the higher modulation (depending on
the measured and set values), the pressure control or temperature control is used as
a speci
fi
cation for the power component.
Selection ampli
fi
er = OFF
(factory setting)
No comparison of the two control circuits.
Selection ampli
fi
er = ON
Comparison of the modulation of control circuit 1 and control circuit 2 with automatic
control active at the highest value.
OFF
Selection ampli
fi
er
20.08.2014
v_comparator_c1_c2.vsd
Controller 1
U
V
W
A
Sensor 1
Controller 2
Sensor 2
C2
C1
Comparator
Cout = C1 @ C1 > C2
Cout = C2 @ C2 > C1
Cout
9.9.13
Data on the total control deviation
The total control deviation is comprised of the sum of the control deviations for performance quantities
and work quantities combined and refers to the speci
fi
ed areas.
In direct reference to the acquired input and controlled variables, the maximum deviation to the target
value is <
±
5 %. By activating the menu-assisted adjustment, the total control deviation can be
reduced to a value of <
±
1 %.
For indirect reference of the acquired input value to the controlled variable, i.e., two physical variables
still need to be converted, the deviation can be reduced to <
±
5 % through adjustment.
In the case of an internal default value through the integrated or external terminal, the control deviation
remains at <
±
0.5%.
Operating Instructions
Fcontrol
–
model series FXDM25/32AM
Programming
L-BAL-E212-GB 1451 Index 003
Part.-No.
65/123
