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:
G ph opposed = wrong generator phase sequence
Inverted phase polarity
inverted phase polarity can be detected due to wrong connection of separation transformers between
controller and generator / mains / bus voltage. Phase sequence is OK but some phase(s) is connected
in opposite way (180° shift).
Following alarms can be detected:
GEN L1 neg
= generator phase L1 is inverted
GEN L2 neg
= generator phase L2 is inverted
GEN L3 neg
= generator phase L3 is inverted
Wrong phase sequence and inverted polarity
It is combination of both previous alarms
G ph+L1 neg = wrong generator phase sequence and phase L1 is inverted
G ph+L2 neg = wrong generator phase sequence and phase L2 is inverted
G ph+L3 neg = wrong generator phase sequence and phase L3 is inverted
Hint:
Phase sequence detection is active when voltage in all three phases is >50VAC and all phases angles
are in the range 120° ± 20.
Phase sequence alarm detection is 1 sec delayed to avoid transient effects.
Sensor fail detection
Sensor fail Fls is detected when measured value is 6,2 percent out of range. Controller screen
displays in this case string #### instead measured value.
R1
R2
R3
R4
R5
Sensor
Failure
Range of sensor
-6%
Range of measurement
100%
+6%
Sensor
Failure
InteliLite – MRS10/11/15/16, SW version 2.2, ©ComAp – November 2004 53
IL-MRS-2.2.pdf