2. Measurement of the DC voltage through resistive divider
If you need to measure the voltage higher than 33V to INPA1÷INPA4 or 3.3V on INPA5,
INPA6 use a resistive divider. U voltage dividers connected to the terminals should be safe,
or properly protected against accidental shock hazard.
WARNING: The supply voltage of long cables exposed to lightning, for example, the pho-
tovoltaic system can result in the transfer of electrical charge on the sensitive input Lan
Controller and can cause damage.
R
1
R
1
U
U = U
1
+ U
2
U
=
R
2
R
2
U
1
U
1
U
2
U
2
R
1
+ R
2
=
R
2
U
2
EXAMPLE
U – Input voltage for the measurement
U
2
– the voltage at the input INPA1÷INPA4 or INPA5, INPA6
for the measurement of up to 33 V at the input INPA5 or INPA6 (max. 3.3 V)
should be used divider:
R
1
= 9 kΩ, R
2
= 1 kΩ,
for the measurement of up to 360 V at the input INPA1÷INPA4 (max. 33 V)
should be used divider:
R
1
= 99 kΩ, R
2
= 10 kΩ,
As a result of the multiplier enter of sharing: U / U
2
Pin1
GND
INPA1÷INPA4
R
1
U
R
2
U
2
R
1
U
R
2
U
2
GND
INPA6
Pin2
Pin5
INPA5
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