Operating instructions for KEA 252 PA
11 / 25
File: BA_KEA 252 PA_EN_Ver 2016-07-01
______________________________________________________________________________________
Alfred Kuhse GmbH
Telephone: +49 4171-798-0
kuhse@kuhse.de
Subject to technical changes
An der Kleinbahn 39, D-21423 Winsen (Luhe)
Fax: +49 4171-798-117
www.kuhse.de
12.4.
Auto operating mode
12.4.1.
Peak load without mains failure control function
Systems that are only intended for peak load operation, i.e. without mains failure control function, can be inde-
pendently operated without a central control system (ZLT). All control functions that are specified by VDE-AR-
N 4105:2021-08 are fulfilled. Mains disconnection is carried out by the generator circuit breaker. The busbar
monitor is used to detect a return of power as the mains voltage is measured continuously here.
The control orders (power specification and limitation) for the automatic system are either issued via the con-
nections of the relay unit or can be issued by a central control system (ZLT) over the CAN_0 bus. Systems with
several gensets must be linked together over the CAN_0 bus.
A remote start is only possible when all requirements of the VDE-AR-N 4105 with regard to the load enable, and
mains voltage and frequency are fulfilled.
In the event of a mains failure (detected by the internal busbar monitor), the generator is immediately switched
off and a switch-off pulse is issued for the external mains switch. If several gensets are switched on, they are
switched off simultaneously by a broadcast telegram on the CAN bus.
If the power enable falls back to 0%, the genset is relieved and shuts down.
12.4.2.
Standalone operation without peak load
The mains coupling on signal (connection 21 of the KRK-12) is permanently not issued. This deactivates the
voltage monitor in accordance with VDE-AR-N 4105 or E VDE-AR_N 4120, as only standalone operation is
intended. With a remote start command, the genset starts up and only switches to the bar while observing the
locking conditions. The locked connection is made as described below. If several gensets are used, one genset
is dynamically determined as a master and ensures the load distribution.
A deselected, relieved genset (except for the last one) switches off and shuts down after the run-on time.
12.4.3.
Peak load with mains failure control function
For mains voltage monitoring of the emergency current operation, an external voltage monitor must be used. A
mains failure during mains parallel operation is detected by the internal voltage monitor, as the mains voltage is
on the busbar. The external voltage monitor is required for detecting a return of power and mains failure outside
mains parallel operation.
The genset is always started by the remote start input. For an automatic start, any auxiliary drives are switched
on and the parametrised start program is triggered after the start function is enabled. If the genset has not
started at the end of the start program, the failed start alarm is issued and the automatic system inhibited.
After the genset has started up, the generator is switched on while observing the locking conditions as soon as
the nominal generator voltage and frequency are reached.
After removing the start command, the genset switches the generator off, continues to run without load for the
set run-on time and is then shut down.
12.4.4.
Sprinkler prompt
The genset is started and can only be stopped by the Off or Emergency Stop key. The exact process (according
to VDS 2100-22) is described further below.
12.5.
Test operating mode
12.5.1.
General
Test operation is a manual operating mode in which some functions run automatically for safety reasons. If a
remote start command occurs during test operation, the system switches to generator operation. In these cases,
it is no longer possible to switch off the generator circuit breaker manually.
It is then necessary to switch back to
Auto in order for all subsequent processes to be carried out automatically in accordance with the VDE specifica-
tions, and cannot be manually overridden.
12.5.2.
Generator operation
After selecting the test position, any auxiliary drives are switched on and the parametrised start program is
triggered after the start function is enabled. If the generator voltage with its voltage and frequency values are
within the nominal ranges, generator operation can be switched to using the keys arranged in the mimic dia-
gram.
