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Alarm and fault messages
4.2 Alarm and fault messages
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4.2.1 Faults – Causes/diagnostics/remedial measures
First acknowledge the fault with the keyswitch on the control panel.
Check the following if the inverter has not been in operation:
First acknowledge the fault with the keyswitch on the control panel.
Check the following if the inverter has not been in operation:
• Polarity of the PV field input
• Polarity of the DC link connection
• AC phase sequence
• AC voltage (phase-phase, phase-N)
• Polarity of the DC link connection
• AC phase sequence
• AC voltage (phase-phase, phase-N)
Check the following if the inverter has been in operation:
• Is the Fast Stop button in the locked position?
• Is the external power supply available?
• Is the control voltage (24 V DC) present at the relevant terminals?
• Is the grid voltage within tolerance?
• Have fuses blown or have automatic fuses tripped? If yes, find the cause of the problem.
• Is the external power supply available?
• Is the control voltage (24 V DC) present at the relevant terminals?
• Is the grid voltage within tolerance?
• Have fuses blown or have automatic fuses tripped? If yes, find the cause of the problem.
If none of the reasons above is the source of the fault, it may have been caused by a problem on the
control unit.
If a CU printed circuit board is defective, it must be replaced with a new one. Never install a CU in a
different device to check whether it is defective or not.
This could cause very serious damage to the other device.
(Read out and check all CU parameters.)
(Read out and check the S7 HW Config.)
Differences in potential in the PV field
If a PV system is not yielding the required output, the problem could indicate a difference in potential.
This means that there is a difference in voltage between the field segments. Because the field segments
are connected in parallel, an average voltage value is supplied under these conditions and this means in
turn that the field segments are not operating at the MPP.
To identify this type of fault, measure the no-load voltage and the MPP voltage at the inverter inputs and
compare the measured values. A deviation of more than 10 V is an effective difference in potential which
will cause a reduction in output.
If a PV system is not yielding the required output, the problem could indicate a difference in potential.
This means that there is a difference in voltage between the field segments. Because the field segments
are connected in parallel, an average voltage value is supplied under these conditions and this means in
turn that the field segments are not operating at the MPP.
To identify this type of fault, measure the no-load voltage and the MPP voltage at the inverter inputs and
compare the measured values. A deviation of more than 10 V is an effective difference in potential which
will cause a reduction in output.