IGS-NT-BC, SW Version 1.2.0,
©ComAp – January 2019
IGS-NT-BC-1.2.0 Reference Guide.PDF
18
Functions
OFF-MAN-AUT mode
OFF mode
The bank (gen-sets inside the bank) cannot be started. If START,STOP,BCB ON/OFF buttons are pressed
the controller will not respond.
When the gen-set inside the bank are running it is not possible to switch directly to OFF mode. First you
have to stop the bank.
MAN mode
1) START
– Activates the internal signal
Sys start/stop
and causes start of the gen-sets inside the bank.
2) GBCB ON/OFF
If the bank bus bar voltage is out of the limits (adjusted in the setpoint group
Gener protect
) controller
does not respond to the BCB ON/OFF
a) controller closes BCB to dead bus.
b) controller starts BCB synchronizing when bus voltage is OK and MCB is closed or when other
bank provide healthy voltage to the bus. Closes the BCB when synchronized and stays running
in parallel (island or mains parallel).
c) Unloads the bank and opens the BCB if the bank was running in parallel to the mains or to other
banks.
3) STOP
a) When bank is running in parallel to other banks or the mains: transfers the load to the mains or
to other banks, opens BCB (internal signal
Sys start/stop
is deactivated and the gen-sets inside
the bank are going into cooling state and then are stoped).
b) When bank is running in single island (or in general there is no mains and no other bank to take
over the load to): opens BCB (internal signal
Sys start/stop
is deactivated and the gen-sets
inside the bank are going into cooling state and then are stoped).
AUT mode
1) When the LBI: Sys start/stop (at the Bank Controller) is activated, only the subordinated gen-sets
necessary to cover the actual load and requested load reserve are started (setpoint
Powermanagement:
Pwr management
is set as ENABLED. The power management can be based on kW, kVA or on relative
% reserve. The start of the bank is:
a) 1 sec delayed when MCB FEEDBACK binary input is closed (mains parallel)
b) delayed #
SysAMFstrt del
when MCB FEEDBACK binary input is opened
– start to island parallel
(multi AMF) situation
2) The first bank closes the BCB to the dead bus (if the system with BCB is used), the rest are
synchronized to the bus as soon as at least subordinated gen-
set in the bank closes it´s GCB and
energizes the bank powerline.
3) When all necessary gen-sets are connected to the bus and
LoadRes strt
is achieved, SYST RES OK
output is closed. Output could be used to close the MGCB (Master GCB).
4) Total load and power factor are shared between parallel operating gen-sets.
5) Close input LOAD RESERVE 2 (or 3 or 4) and use setpoint
LoadRes strt2
(or 3 or 4) to switch to another
load reserve setting. E.g. high load reserve during system start to be able to switch-on big devices, then
during normal operation lower reserve to save engines (and fuel).
6)
If total load increases and selected
LoadRes strt
is no more fulfilled, after a
Next start del
next ready
gen-set with the highest priority (lowest priority number) is started and synchronized to the bus.
7)
If load decreases and selected
LoadRes stp
is exceeded, after a
Next stop del
the running gen-set with
the lowest priority is unloaded, got off line, cooled and stopped.
8) Complete gen-sets group stops when binary input SYS START/STOP opens. If the input MCB
FEEDBACK is closed (gen-sets are in parallel to mains) controllers softly transfer the load to the mains.
When gen-set is unloaded (see
GCB open level
or
GCB open del
) opens the output GCB
CLOSE/OPEN.
9) The Running hours balancing or Load demand engines swap can be activated in power management.
