Technical Manual RF Socket RF-AxK1ST.01
MDT technologies GmbH
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33
The active power measurement possible by simultaneous measurement of current and voltage
output of the real active power. So the returned value is no longer a "theoretical" power at rated
voltage, but the real power.
For the active power measurement, a monitoring of the load can be enabled and triggering specific
actions. At the exceedance of load, the
hysteresis
causes a shift of the cut-off threshold. So, a
hysteresis of 10% and a value for load exceeding of 100W causes a value for exceedance of 100W,
which is only turned off when the measured value falls below 90W. In the underrun, a hysteresis of
10% and a value for underrun of 100W causes an active lower deviation of load at 100W, which is
released until the value exceeds 110W again.
The
retention time by exceedance/deviating
specifies how long ab exceedance/deviation must be
measured for the output before the action for exceedance/deviation is triggered. So a retention time
by exceedance of 10s causes that an exceedance must be measured for 10s before the action for
exceedance is triggered. The retention time works with the hysteresis output. Thus, if an exceedance
is measured, the power must fall below the hysteresis value for stopping the retention time tmer.
The following table shows the available communication objects:
Number
Name
Length
Usage
8
Active power
2 Byte/
4 Byte
Sending the measured active power
13
Exceedance of load
1 Bit
Sending an exceedance of load
14
Lower deviation of load
1 Bit
Sending a deviation of load
Table 18: Communication objects power measurement
