Temperature Set Points - Danfoss VACON NX Commissioning And Maintenance Manual

COMMISSIONING
Table 5.3-2 shows an example on how to set the flow switching point to 68.
Descr iption
1. Change to setting mode
2.
3.
4. Display hundred digit
5. Display ten digit
6. Increase ten digit
7. Display one digit
8. Increase one digit
9. Save new switching point
Table 5.3-2 Setting flow switching point
The settings on the FTSA11 should be the following:
•
Measuring range, HI, high range 30 to 300 cm/s.
•
Hysteresis, h05, 5% hysteresis.
•
Switching order, n.c, normally closed.
•
Temperature switch, OFF, no temperature switch point used.
•
Flow switch point, according to calculations in
setting the switch point of the
5.3.6 Temper atur e set points
condensation. The default setting of the parameter P3.5 in the HX control unit application is 25
This means that the 3-way valve adjusts the flow in the secondary circuit to keep the primary circuit
liquid temperature at 25
There are three factors that will affect the nominal temperature of the primary circuit:
•
Ambient maximum temperature at the main drive installation
•
Ambient maximum relative humidity at the main drive installation
•
Secondary circuit maximum temperature
All of these factors have to be taken into consideration when calculating the primary circuit
temperature set point.
•
If the humidity is high, condensation will occur in the piping inside the main drives and
therefore cause a malfunction.
•
If the ambient temperature is too high the load of the drive must be reduced.
•
And if the customer and/or end-user have an existing cooling system, which is going to be
connected to the secondary circuit, the temperature of this circuit might be the deciding
factor.
The primary circuit temperature is individual for every project. Here are three examples that show
how the primary circuit temperature is calculated depending on which of the three above-mentioned
factors is the deciding one:
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Push buttons
2 x , 2 x
1 x
1 x
1 x
1 x
1 x
1 x
8 x
4 x
FTSA11.

C (measured by the FTSA11 before the drives).
Displ ay
, 2 x
0
flashing)
5
6
0
8
(actual flow)
chapter 5.4.2, Adjusting the system flow and
VACON 3 3

C.
5