KMB NOVAR 2600, Operating Manual

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NOVAR 2600 Operating Manual
If the tariff 2 control power parameter is entered as positive value the controller interprets it as
“unsigned” limit value of power. In such case the tariff 2 applies as soon as absolute value of the
3Pfh power drops below preset level “T2CP”, i.e. inside the middle zone positioned symmetrically to
both sides of zero power axis - see the lower tariff zone bar on the following figure.
Fig. 4.6 : Tariff 2Control Power Specification Options
On the contrary, if the tariff 2 control parameter is entered as negative the controller takes it as
“signed” limit value of power. In such case the tariff 2 parameters applies as soon as positive
3Pfh
power drops below the preset level “T2CP” and keeps applied downto zero level and farther to all
negative halfplane - see the upper tariff zone bar.
If the power value is set as “signed” it is indicated with foregoing “S” character ( for example “S 10% of
P
NOM
“ ).
4.3.1.7 Control Strategy
Power factor control is carried out by network operator requirements, mostly according local electric
energy distributor billing scheme. Usually, only three-phase power factor is essential; but in some
applications individual phase power factors must be controlled.
Accordingly, the power factor
control strategy parameter must be set to one of following options :
• 3p … three-phase power factor control only is controlled (regardless single-phase power
factor values)
• 3p+1p … both three-phase power factor and individual single-phase power factors are
controlled ( default setting )
• 3*1p … all of single-phase power factors are controlled individually without any relation to
each other (usable for single phase outputs only)
If the
3p
strategy is set the total three-phase (ΣL) value of control deviation
3ΔQfh
is determinative for
power factor control process - both for the the ΣL control time management and for control intervention
evaluation. The ΣL control time bargraph only works in such case.
At other settings, individual single phase control deviations control corresponding phase control times
and their behaviour can be checked on the phase control time bargraphs ( the ΣL control time
bargraph is disabled ).
If the
3p+1p strategy is set, new control intervention occurs as soon as any of the phase control times
expires. The common control intervention is evaluated to achieve optimal power factor in all of
phases.
The
3*1p
strategy is designed for independent single-phase power factor control. Three phase control
times are evaluated simultaneously and when expired, separate corresponding phase control
intervention is evaluated and executed. This strategy can be used when single-phase type
compensation sections ( outputs) only are connected.
When 3p+1p strategy is set the non-mixed choke control mode cannot be used..
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