Manual Energy Storage Inverter ESI-S
Commissioning instructions 169
Background information on all the items discussed above is given in
At this stage, verify the functioning of the settings made for the digital I/O if possible
(e.g. remote control, local start/stop buttons).
Remarks:
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Refer to
for troubleshooting problems
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inverter running at 100% load while RMS current rating is not attained
Under exceptional conditions it is possible that the inverter is showing a 100%
load indication whereas its nominal RMS current rating is not yet attained. This is
because the inverter has reached an operating limit other than the RMS current
limit. Possible other limits are:
•
Temperature limit due to a too high ambient temperature or a failing
cooling system
•
Peak current limit due to an a-typical peak current requirement of the load
•
Peak voltage limit due to an a-typical DC-link voltage requirement of the
load or due to a high network voltage
Under all these conditions, the inverter will run in limited mode and may not
attain 100% of its nominal current rating.
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Harmonics put in ‘standby’ by the system:
When selecting a harmonic that has not been selected before, the inverter will
identify the network characteristics for this harmonic. After this process, the
inverter will launch the filtering process for the component considered. If during
the network identification process for a given harmonic a special (problematic)
condition is encountered, the system puts the component in ‘standby’. In that
case the harmonic selected is not filtering for the time being. Special network
conditions include extremely high impedance of the supply network or extremely
low impedance towards the load. When consulting the harmonic selection table
of the ESI-Manager, harmonics put in ‘standby’ can be recognized by the label ‘S’
that is displayed in the harmonic selection column (which reads otherwise either
‘Y’ or ‘N’). The following possibilities exist to bring a harmonic out of standby:
•
The user restarts a network identification process by changing the ‘S’
indication into a ‘Y’ indication in the harmonic selection table
•
The inverter automatically restarts an identification process on all
harmonics that were put in standby previously when a successful
identification of another harmonic is made. As a result, the harmonic
considered will be automatically filtering when the network conditions
allow for this.
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If plain capacitors (i.e. capacitor banks not incorporating detuning reactors) are
present in the network it is recommended to switch them off or change them into
detuned banks. Sometimes, the commissioning engineer is faced with an
installation where both an active inverter and plain capacitors are present