IS-NT-Async-SPI, SW Version 1.2, ©ComAp – February 2011
IS-NT-Async-SPI-1.2.PDF
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operation type (island, parallel or any transitions)
Force value possibility: Yes
Ld shed level [ % ] (FV)
When gen-set load exceeds this level for more than Ld shed delay time, controller proceeds to the next Load
shedding stage - the next binary output Load shed x is closed.
Step: 1 % of Nomin power
Range: Ld recon level - 200 % of Nomin power
Force value possibility: Yes
Ld shed delay [ s ] (FV)
Time delay for LD shed level limit.
Step: 0,1 s
Range: 0,0 – 600,0 s
Force value possibility: Yes
Ld recon level [ % ] (FV)
When gen-set load drops under this level for more than Ld recon delay time, controller proceeds to the lower
Load shedding stage. The binary output for higher stage is opened (Load shed x). Automatic load
reconnection works only when AutoLd recon = ENABLED.
Step: 1 % of Nomin power
Range: 0 - Ld shed level
Force value possibility: Yes
Ld recon delay [ s ] (FV)
The amount of time that the load has to be under Ld recon level before the next part of the load is
reconnected.
Step: 1 s
Range: 0 - 600 s
Force value possibility: Yes
AutoLd recon [ DISABLED / ENABLED ] (FV)
Switch between manual and automatic reconnection of shedded load.
DISABLED Rising edge on binary input MAN load recon resets controller to the lower stage, but only if
the load is under the Ld recon level. Ld recon delay is not important in this case.
ENABLED Load reconnection is automatic and depends on setpoints Ld recon level and Ld recon
delay. Binary input MAN load recon has no function.
Force value possibility: Yes
Hint:
To understand Load shedding better see diagrams in section Load shedding (page 9 and 10).
Timer settings
Timer channel 1-16
Defines the setting of particular timer channel.
There is 16 channels, each defines occurrence date and time (year, month, day, hour, minute), duration time
(in minutes, maximum is 24*60), repeating period (day, week, month, once). In case of week – day of the
week selection, when should be executed + selection of repeating (every 1
st
, 2
nd
, 3
rd
or 4
th
week); In case of
month – day of the month selection (e.g. every 3
rd
day or every 2
nd
Monday)
Every channel can be disabled by blocking input. If blocking input is active then the timer is not activated
even if it should be, according to it’s other settings.
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