Benning PV 1-1+ - Protective conductor resistance measurement

5.4 Protective conductor resistance measurement
Operation
5290 / 06/2023 enBENNING PV 1-1+28
5.4 Protective conductor resistance measurement
Requirements
• Please observe the requirements for measuring [}page24].
• Approved safety measuring lines
• Corresponding measuring ranges [}page22]
• In an error-free condition of the PVmodule/ PVstring, no voltage is applied to the
measuring points.
If a voltage higher than 30V is applied to the test probes during measurement, the
measurement will be blocked. If a voltage lower than 30V is applied, a low-impedance
voltage source might trip the built-in fuse of the device [}page41].
Figure4: Protective conductor resistance
Procedure forsingle measurement
1. Connect the 4mm safety measuring lines to the device [}page25].
2. Only for new safety measuring lines: Please carry out a null balance [}page27].
3. Bring the 4mm safety measuring lines into contact with the measuring points.
4. Press the “R
PE
”key and read the measured value on the digital display.
5. Press the “Save”key to store the measured value to the next free storage location available.