InteliGen
NT
, InteliSys
NT
, InteliMains
NT
– Troubleshooting Guide,
SW version IGS-NT-3.1.0, IM-NT-3.1.0, ©ComAp – August 2018 16
IGS-NT Troubleshooting Guide.pdf
Example of correct Power management and Load shedding setting is on this
picture:
You can see that the Pwr management: #%LdResStrt1 limit is crossed first when system load
goes up and request to start additional genset is issued before the load shedding request.
However, it is not enough to set limits in the suggested way to make system work properly. It
is important to set Pwr management: #NextStrt del much shorter than Load shedding: Ld
shed delay so there is enough time for starting genset to start, synchronise and take over load
before a load shedding output is activated.
MGCB is not closed although gensets are running
Problem:
All available gensets are running and connected to bus (GCB’s are closed), but IM-NT does
not close MGCB.
Reason of the problem is that Act Reserve (Actual load reserve) value is not higher than value
of currently used Pwr management: LoadResStrt x setpoint (binary input functions Load res
x can be used for switching between LoadResStrt x setpoints). Act Reserve has to exceed a
LoadResStrt x value so IM-NT evaluates system reserve as sufficient to connect load to
gensets (this evaluation is not done when system should run in parallel with mains).
Check state of the Syst res OK signal in InteliMonitor (go to Values/Log Bout/LogBout 4) to
see if Act Reserve is evaluated by IM-NT as sufficient enough (condition for MGCB closing is
ActReserve > LoadResStrt x)
Solution:
a) Check if setpoint Pwr management: Pwr management is set to ENABLED in genset
controllers (there is no such setpoint in IM-NT itself). Act Reserve value (P
BNom
) in IM-NT is
based on information it receives from gensets power management system. There is no
information about available power sent from gensets controllers to IM-NT if Pwr management
is set to DISABLED.
b) Decrease value of a currently used Pwr management: #LoadResStrt x setpoint so available
Act Reserve (P
BNom
) is higher than the #LoadResStrt x setpoint. Do that if you consider
available Act Reserve power sufficient enough to cover a system load.
You can use alternative #LoadResStrt x setpoint with setting low enough to enable MGCB
closing (use a Load res x binary input function for switching to a different LoadResStrt x
setpoint).
c) Set Pwr management: #LoadResStrt x setpoint to a negative value if you can not set Pwr
management: Pwr management setpoint to ENABLED in gensets controllers (e.g. IGS-NT-
LSM+PMS dongle is not used in genset controllers and power management function is not
available then). It is necessary to fulfill the following condition to enable MGCB closing:
P
BNom
> P
Akt
+ Reserve
P
BNom
Sum of the nominal power of all running gen-sets (displayed as Act Reserve
value by IM-NT)
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