ComAp IG-NT - PLC Functions

IS-NT-Async-SPI, SW Version 1.2, ©ComAp – February 2011
IS-NT-Async-SPI-1.2.PDF
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“Engine started” conditions
- Engine speed (RPM) > Starting RPM or
- AI: Oil press > Starting POil or
- D+ terminal active for minimum 1s or
- BI: RunIndication 1 or 2 or 3 = active or
- Generator voltage > 25% of GenNomV (any phase)
“Engine running” conditions
- Engine speed (RPM) <> 0 or
- AI: Oil press > Starting POil or
- D+ terminal active or
- BI: RunIndication 1 or 2 or 3 = active or
- Generator voltage > 15V (any phase) or
- Generator frequency <> 0 Hz
“Still engine” conditions
- Engine speed (RPM) = 0 and
- AI: Oil press < Starting POil and
- D+ terminal not active and
- BI: RunIndication 1 and 2 and 3 = not active and
- Generator voltage < 15V (all phases) and
- Generator frequency = 0 Hz and
- if all above conditions are fulfilled, additional 2s delay is necessary to confirm “still engine”
Note:
If any of the functions not used (e.g. BI RunIndication3 not configured), it’s state is omitted in the evaluation.
This is not valid for RPM comparisons, this condition is always active.
PLC functions
Config item Selection
Available
IS-NT
Note*
Log Func I.
64
AND, OR
2 to 8 inputs
Binary output
Log Func II.
16
XOR, RS (flip-flop)
2 inputs
Binary output
Comp Hyst
16
Analog input
Two limits
Binary output
Comp Time
8
Analog input
One limit + delay
Binary output
Ana Switch
16
Two analog inputs
Analog output
Binary input as selector
Math Func
16
ADD, SUB, ABS, AVG, MAX, MIN
Two analog inputs
Analog output