14
Setting of parameters
Pyranometer KNX PY
• Status: 22.07.2019 • Technical changes reserved. Errors reserved.
6.2.
Threshold values
The instantaneous global radiation in Central Europe at mid-day in summer is when
the sky is clear 900 … 1000 W/m² and when the sky is overcast approx. 100 W/m².
6.2.1. Threshold value 1 / 2 / 3 / 4
Threshold value
If threshold value is set via Parameter:
If threshold value is set via Communication object
Switching output
Transmission delays after power up and programming
Measurement values and threshold values
5 secs … 2 h
Switching outputs and logic outputs
5 secs … 2 h
Use threshold value 1 / 2 / 3 / 4
No • Yes
Threshold value setting via
Parameter • Communication object
Threshold value setting via
Parameter
Threshold value in W/m²
0 … 2500; 500
Hysteresis of the threshold value in %
0 … 50; 20
Threshold value setting via
Communication object
The last communicated value shall be retai-
ned
• not
• after voltage restoration
(the changed threshold value can be safed
at least 100,000 times )
• after voltage restoration and
programming (Attention: Do not use
during initial start-up)
Start threshold value in W/m²
valid until 1. communication
0 … 2500; 500
Type of threshold value change
• Absolute value with a 16-bit comm. object
• Increase / Decrease with a comm. object
• Increase / Decrease with two
comm. objects
Step length in W/m²
(only if type of threshold value change is
„Increase/Decrease“)
1 • 2 • 5 • 10 • 20 • 50 • 100 • 200
Hysteresis of the threshold value in %
0 … 50; 20
Output is
(TV = Threshold Value)
• TV above = 1 | TV - Hyst. below = 0
• TV above = 0 | TV - Hyst. below = 1
• TV below = 1 | TV + Hyst. above = 0
• TV below = 0 | TV + Hyst. above = 1
Switching delay from 0 to 1
none • 1 secs … 2 h
