IS-NT-Async-SPI, SW Version 1.2, ©ComAp – February 2011
IS-NT-Async-SPI-1.2.PDF
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ExtValue1 rate [ X/s ] (FV)
ExtValue2 rate [ X/s ] (FV)
ExtValue3 rate [ X/s ] (FV)
ExtValue4 rate [ X/s ] (FV)
ExtValueX rate of change per second. If the binary input ExtValueX down or ExtValueX up is active, the
value is changed according to this rate.
Step: 1 X/s
Range: 1 – 10000 X/s
Hint:
If binary input ExtValueXreset is active, the corresponding ExtValueX is held at its default value, regardless
of the activity of inputs Up and Down and regardless of incoming external set commands.
Using this function in combination with Force value you can externally control selected setpoints’ values and
achieve some special behaviour of the controller.
ExtValue1deflt [ X ] (FV)
ExtValue2deflt [ X ] (FV)
ExtValue3deflt [ X ] (FV)
ExtValue4deflt [ X ] (FV)
ExtValueX default (starting) value. If ExtValueX is changed from this default value using Modbus command,
the new value is kept in ExtValueX until another command arrives or until the controller has been switched
off. If the binary input ExtValueXreset is active, the ExtValueX is held at this value regardless of other
conditions.
Step: 1 X
Range: -32000 – 32000 X
Load shedding
All LOAD SHED outputs are activated (closed) to trip the unessential load when gen-set goes to island:
d) When GCB is closed after mains fail and gen-set starts in SEM / AUT mode.
e) When MCB opens from parallel to mains operation in SEM / AUT mode.
f) Before MCB is opened in MAN mode by button.
The load shedding function is active in all controller modes except OFF.
Load shedding has three steps and each step is linked with its own Load shed x binary output. There is only
one load shed level and delay for all three steps as well as recon level and delay. Load shed can only move
from one step to the next, e.g. No LoadShed to LdShed S1 to LdShed S2 to LdShed S3 and vice versa.
If manual reconnection of the load is desired, the AutoLd recon setpoint needs to be disabled (AutoLd recon
= DISABLED) and the MAN load recon binary input needs to be configured.
Rising edge on this input resets the controller to a lower stage, but only if the load is under the Ld recon level
at that moment.
Ld shed active [DISABLED / ISLAND ONLY /
ISL+TRIP PARAL / ALL THE TIME] (FV)
DISABLED - Load shedding is switched off at all
ISLAND ONLY - Load shedding is active only in island operation; before GCB closing all the LdShed outputs
get closed; in parallel operation with mains is always switched off
ISL+TRIP PARAL - the same functionality as ISLAND ONLY, but in additional it closes all the LdShed
outputs during the power failure ( =change from parallel to island operation); according to the Load in island
operation it can be potentially reconnected beck
ALL THE TIME - Load Shedding works only according to gen-set Power, it works without reference to
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