Kohler EKOZD Series Service page 251

Unload Signal
The unload signal sets the Load Enable input to the
paralleling logic to false and turns the synchronizer off.
The paralleling logic will go into power control mode,
unload a generator according to the load/unload ramp
rate, and disconnect from the paralleling bus any time
that load enable is removed. If the synchronizer is
enabled, the paralleling logic will immediately start
synchronizing to the paralleling bus and will connect
again to the bus when synchronized.
To avoid unintended reclosing, the synchronizer is
disabled during the unloading process, once the stop
signal is sent to the Generator Control Logic, the unload
signal is removed, re-enabling the Synchronizer and
reverting Load Enable to the previously commanded
state.
Note: If Load Enable is set to false externally (by digital
input, SiteTecht, or the user interface),
Generator Management is disabled for this
generator. Unloading and disconnecting will only
occur when load enable is removed (it changes
from true to false).
Stop Signal
The Stop signal is sent to the Generator Control Logic. If
this input is set, the controller will ignore any start signal
that it is receiving. The stop signal is sent if the generator
is disconnected from the paralleling bus and receiving a
Generator Management stop signal.
Note: The Stop signal requires Generator Management
to be active, if Generator Management is
disabled (by user selection, configuration
mismatch, order mismatch, preemptive warning,
shutdown, or incorrect setting (like synchronizer
set to off, load enable set to off, Baseload mode,
etc.), the stop signal will be removed.
Network Data
The following information is read from the PGEN
communications network for Order Selection:
Order of all generators.
D
Runtime Hours of all generators(for Runtime mode).
D
Fuel Level of all generators (for Fuel Level mode).
D
The following information is read from the PGEN
communication network for Start/Stop Threshold
Calculation:
Availability of all generators (able to start if requested).
D
Connection Status with paralleling bus.
D
Order of all generators.
D
TP-6953 7/19
Activation Logic:
Runtime Threshold of all generators.
D
Fuel Level Threshold of all generators.
D
Order Selection Method of all generators.
D
Minimum Gens Online for all generators.
D
Min Load Shed Priority for all generators.
D
Stable Delay for all generators.
D
Order of all generators.
D
Bus Metering
Bus Total Real Power (sum of the power supplied by all
generators which are connected to the paralleling bus).
13.5.4 Parameters
The following parameters are used for Order Selection:
Generator Management Control Mode.
D
Runtime Hour Difference (for Runtime Mode).
D
Runtime Hours (for Runtime Mode).
D
Fuel Level Difference (for Fuel Level Mode).
D
Fuel Level Percentage (for Fuel Level Mode).
D
Generator Management Order (for Manual Mode).
D
The following parameters are used for Start/Stop
Threshold Calculation:
Generator Management Start Percentage.
D
Generator Management Stop Percentage.
D
Generator Management Order.
D
Generator Management Total Bus Capacity.
D
13.5.5 Order Selection
The Start/Stop Order only changes when the need for a
change is detected. The detection of a need to change is
dependent on the order selection mode.
Manual Mode: The order is only automatically re-sorted
if the Generator Management orders of all generators
on the PGEN network are not unique and sequential.
Runtime Mode: The order is only automatically
re-sorted if the runtime hours of a higher-order
generator are less than the runtime hours of this
generator (including the Runtime Hour Difference if only
one of the generators is stopped) or if the runtime hours
of a lower-order generator are greater than the runtime
hours of this generator (including the Runtime Hour
Difference if only one of the generators is stopped).
Fuel Level Mode: The order is only automatically
re-sorted if the fuel level of a higher-order generator is
greater than the fuel level of this generator (including the
Section 13 Generator Management Information 251