Measuring Voltage - VOLTWERK SmartConnect 8 Instrucciones De Servicio

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Result
Result
7.2
SmartConnect
Operating manual
10. Check that the connecting jumpers on the DC main connection
terminals are complete.
SmartConnect has undergone a visual inspection.
Check the earthing.
1. Check the earthing of the SmartConnect. Note the following:
The housing must be connected to the reference earth of the
|
system (protective earth connection). Note the following:
Laying the earth from the auxiliary voltage supply is not sufficient.
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The earthing connection must be connected to the outside of the housing.
The earthing resistance is the electrical resistance between the protective
earth connection and the reference potential of the ground.
Earthing resistance is measured by running an alternating current over the
earthing conductor, the earth electrode and the earth-spreading resistor. It
can be measured either directly or indirectly.
 U
R
/I
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A
L
F.
R
Earthing resistance (protective earth).
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A
U
Contact voltage.
|
L
I
Residual current.
|
F
2. Check the earthing resistance. Note the following:
R < 3 .
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3. If R > 3 , correct the earthing.
The earth connection has been inspected.
For direct measurement, an earth probe is required. For indirect
measurement, the approximate earthing resistance is determined using an
'earth-electrode loop resistance measurement', without the use of a probe.

Measuring voltage

Prerequisites
The mains cable is connected.
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The DC disconnect is switched off (Off).
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The central inverter is isolated.
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The strings are connected to the SmartConnect.
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The DC main cable on the central inverter is connected.
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Required tools and measuring devices
Device key.
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Voltmeter, measuring range 0–1000 V
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following:
All measuring devices and cables must have protection class CAT II
|
(1000 V) in accordance with EN 61010-1.
Circuit faults may also lead to voltages of U > 1000 V.
|
7 Commissioning
; 0–300 V
. Note the
DC
AC
47

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