Manual Energy Storage Inverter ESI-S
Troubleshooting guide 203
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11 Troubleshooting guide
11.1 What this chapter contains
This chapter presents the troubleshooting guide for the inverter. The fault treatment
procedure is described. Also, an overview of possible errors is given. Finally,
recommendations are made on how problems may be resolved.
WARNING: All troubleshooting and repair work described in this chapter should only
be undertaken by a qualified electrician. The safety instructions presented in
Chapter
of this manual must be strictly adhered to.
WARNING: High AC and DC voltages may be present in the inverter enclosure. Do not
open the panel and touch any inverter parts unless you have ascertained that they do
not carry dangerous voltage levels.
WARNING: Under no circumstances close the DC and AC contactors manually. Failure
to adhere to this guideline may result in physical injury and/or in inverter damage.
WARNING: Some checks may have to be made with the supply on and the inverter
protective cover removed. These tests must be carried out only by authorized and
qualified personnel, in accordance with the local regulations. Apply the safety
guidelines that are presented in
Chapter 2
. Failure to adhere with the safety guidelines
may result in lethal physical injury.
11.2 Fault treatment procedure
All faults that occur are stored in the inverter event log and are analyzed by the inverter
controller. The event log is of the circular type and can store up to 200 events. It can be
accessed through [/Welcome/ESI Monitoring/Event logging]. Background information
on the event logging display is given in
Section 7.10.3
A fault can either be non-critical or critical.
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A non-critical fault is a transient fault (e.g. a voltage spike). When a non-critical
fault occurs the inverter may stop the switching of the IGBTs momentarily (< 40
ms) but they will automatically restart. The only way to pick up this type of fault
is to analyze the event log. Given the transient/random character of this type of
fault, the inverter performance will hardly deteriorate when it occurs.
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A critical fault is a fault that after occurrence cannot be successfully automatically
cleared by the system within a reasonable time. The time frame considered
