KMB NOVAR 2600, Operating Manual

Page: 39 / 96

NOVAR 2600 Operating Manual
• THDU > … Total Harmonic Distortion of voltage alarm
• THDI > … Total Harmonic Distortion of current alarm
• P>< … active power exceeded/drop alarm
• PF>< … PF control failure alarm
• PF>, PF< … overcompensation/undercompensation alarm
There are following exceptions in the standard type alarms behaviour :
• I<, P>< … When the undercurrent actuation gets active, fixed sections stay unaffected.
• I>, PF>, PF< … Indication can be set only ( no actuation function ).
• P>< … Function can be set to signed or unsigned control quantity value to be evaluated in
the same way as the tariff 2 control power parameter (see above). Depending on this, either
standard value or absolute value of active power value is compared with the preset limit.
•
PF><
… Power factor control deviation ΔQfh is checked for the PF control alarm. But there is
not any presetable limit; the alarm gets active as soon as the PF control deviation exceeds
actual control bandwidth (usually one half of the reactive power value of the smallest output)
for preset delay time.
The alarm has no actuation function.
4.3.3.2 Fast Actuation Reaction Alarms
These alarms have special common features :
• actuation reaction time is 20 ms (fixed)
• affected outputs are disconnected immediately ( during 20 milliseconds ) and all at once (not
step-by-step)
• deactivation delay of the actuation is 5 seconds (fixed)
The fast alarms are :
• U<<
… measuring voltage loss alarm. Both the alarm limit and the alarm control quantity are
fixed – 20% of preset U
NOM
voltage and the actual U
LN
phase ( line-to-neutral ) voltage,
respectively – they cannot be changed.
• EXT … external alarm. The alarm gets active as soon as appropriate voltage ( see tech.
specifications) is applied to the instrument's digital input terminals. It can be used only at
controller models equipped with the digital input, of course.
4.3.3.3 NS> - “Number of Switching Operations Exceeded” Alarm
You can use this alarm for contactors wear-out indication.
The indication limit can be set in thousands of switchings. Number of switching operations of individual
outputs are checked permanently and as soon as any of the outputs exceeds preset limit, the alarm
indication gets active.
After the contactor replacement, the corresponding output switching counter can be cleared manually.
The alarm has no actuation function.
4.3.3.4 OE - “Output Error” Alarm
This alarm is intended for faulty section indication and disablement.
39