ComAp IL-NT MRS15 - Page 45

InteliLite
NT
– MRS3,4, AMF8,9, SW version 1.4, ©ComAp – October 2008 45
IL-NT-MRS3,4-AMF8,9-1.4-Reference Guide.pdf
Alarm time chart
"All the time" configured protections, I >, I >>, RPM >>, mains failure detection
GCB opened
"Engine running only" protections, engine
water temperature luboil pressure
Underspeed
Stop
Start
Starter OFF
ProtectHoldoff
Switched to
nominal speed
Min Stab Time
GCB closed
Max Stab Time
Gen >V, <V,
>Freq, <Freq
Idle Time
5 sec
Hint:
- <f … underfrequency is evaluated as 75% of Nominal frequency with 3sec delay.
- RPM>> … overspeed protection is set to 115% of nominal RPM value, calculated as
nom. RPM = 30 * Nominal freq.
The Overspeed protection value is increasing from 115 % to 125% of nominal RPM for the duration
of 5sec ProtectHoldOff delay. ProtectHoldOff delay takes place during the start of the gen-set when
some engine protections have to be blocked. This delay starts after reaching 25% of nominal RPM. It
holds true if the value GeerTeeth = 0.
Voltage phase sequence detection
InteliLite controller detects phase sequence on both generator and mains/bus voltage terminals. This
protections are important after controller installation to avoid wrong voltage phases phase connection.
Following alarms can be detected:
Wrong phase sequence
There is fix defined phase sequence in InteliLite controller L1, L2, L3. When the phases are
connected in different order (e.g. L1,L3,L2 or L2,L1,L3) following alarms are detected:
Gen CCW Rot = wrong generator phase sequence
Mains CCW Rot = wrong mains phase sequence
Sensor Fail detection
Sensor Fail Fls is detected when measured value is 6 percent out of range. Controller screen displays
in this case string #### instead measured value.