Measurement 6: Wind/ Sun meas.
Supply water
Wind compensation
6
14
20
m/s
10 V
0 V
30%
70%
100%
min. limit
max. limit
Compensation area calculation
°C
Picture. Wind compensated supply water temperature curve.
Wind sensor meas. area
Example: A wind sensor is in use which has a measurement area of 0...20
m/s. You want wind compensation to begin when the wind velocity is 6 m/s
(min. limit) and compensation to be at maximum value when the wind
velocity is at least 14 m/s (max. limit). Calculate how many percent the
wind compensation limits (min. limit and max. limit) are from the
measurement area's maximum (=20 m/s), and set them as the minimum
and maximum compensation percentages.
Comp/Meas. Data
Min /
30%
Max /
70%
203GT
Measurement
6
41
42
0 - 20 mA
24 VAC
(4 - 20 mA)
Wind and sun meas. transmitter
250
Add
shunt
resistor
1 k
Add series
and
shunt
resistor
1 k
Wind or sun sensor connection:
x 100%
=
x 100% = 30%
Min. limit (m/s)
meas. area's max.
6 m/s
20 m/s
Max. limit (m/s)
meas. area`s max.
14 m/s
20 m/s
Min. compens.=
Max.compens.=
x 100%
=
x 100% = 70%
If measurement sensors that begin from zero are in use, (0...10V or
0...20mA) set the values calculated with the above formula as the
minimum and maximum compensation percentages.
Setting the minimum and maximum compens. when the sensor's measurement area does not begin at zero.
1. Calculate the compensation percentages with the "min. compens." and
"max. compens." formula.
2. See which values should be set for the regulator from the equivalency
table.
0 - 10 V
24 VAC
(2 - 10 V)
Wind and sun meas. transmitter
203GT
Measurement
6
41
42
2-10V
4 -20 mA
28 %
36 %
44 %
52 %
60 %
68 %
76 %
84 %
92 %
100 %
Value obtained
from the formula
10 %
20 %
30 %
40 %
50 %
60 %
70 %
80 %
90 %
100 %
When you connect the wind or sun sensor to measurement 6,
you instruct the regulator when you want the wind or sun compensation to
function. Calculate compensation limits (min/max) in the same way
regardless of which sensor is in use.
The wind and sun compensation ratio indicates how many degrees
compensation changes the supply water temperature and the user can set
this. (See settings p. 8).
The wind and sun sensor measurement signal can be 0...10 V, 2...10 V,
0...20mA or 4...20 mA. Adjust the sensors with the regulator's resistors so
that the measurement message that comes from the regulator is always
0...5 V.
32
