InteliGen
NT
, InteliSys
NT
, InteliMains
NT
– Troubleshooting Guide,
SW version IGS-NT-3.1.0, IM-NT-3.1.0, ©ComAp – August 2018 15
IGS-NT Troubleshooting Guide.pdf
IM-NT BTB connects dead buses together
Problem:
It happens, because even dead buses are evaluated by controller as “healthy”. Reason is
that either setpoints BusL protect: BusL Volt prot and BusLfreq prot are set to DISABLED or
setpoints BusR protect: BusR Volt prot and BusRfreq prot are set to DISABLED. These
settings means that controller does not evaluate if bus is healthy according to bus voltage and
frequency protections setpoints setting, because bus voltage and frequency check are simply
disabled.
Solution:
Change setting of at least one above mentioned setpoint (BusxVolt prot and/or Busxfreq prot)
to ENABLED (in both BusL protect and BusR protect groups) to avoid connecting of dead
buses.
Power management
Gen-set doesn't share load with other gen-sets
Solution:
Check if the gen-set is not running in the local baseload mode. This mode is active if setpoint
ProcessControl:LocalBaseload is set to other value than OFF. If this setpoint is not set to
OFF then the gen-set is taken out of Load sharing and Power management. Fof rmore details
see chapter Local Baseload in IGS-NT-MINT-x.y-Reference Guide.
Running Hours Equalization does not work properly
Problem:
Gensets priority switching based on engine running hours (Pwr management: PriorAutoSwap
is set to RUN HOURS EQU) does not work properly and some or all gensets has the same
priority. It means that gensets with the same priority behaves as one large genset and runs at
the same time.
Solution:
This problem is caused by incorrect priority switching system initialization. Follow these steps
to get rid of the problem:
1. Set #PriorAutoSwap setpoint to DISABLED
2. Set Priority setpoints in all controllers to unique numbers
3. Set #PriorAutoSwap setpoint to RUN HOURS EQU
Load shedding is active although not all gensets are loaded
Problem:
Load shedding outputs (LdShed stage 1,2 and 3) are active although not all available gensets
are loaded (running and connected to bus). The reason is that Load shedding and Power
management control systems are independent and it is necessary to set controller properly to
avoid this situation.
Solution:
Use controller power management in “relative” mode. It means that Pwr management: #Pwr
mgmt mode has to be set to REL (%). Make sure that Pwr management: #%LdResStrt x is
set below Load shedding: Ld shed level so idle genset is started before load shedding output
is activated.
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