Operating instructions for KEA 252 PA
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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
5.
Functions
The following functions are implemented:
1. Start/stop for diesel and gas motor with check of start preconditions
2. Sensors for busbar and generator voltage, frequency and rotating field (asymmetry). A second voltage
and frequency sensor pair is provided for pure emergency power operation (consumer protection).
3. Generator current sensor: Overload, short-circuit, asymmetric load and thermal overload (bimetallic relay)
4. 64 alarm messages, 35 of which are parametrised specific to the customer (text and control) and the con-
trol of another 4 alarms can be parametrised
5. Event memory for 127 messages with real-time clock stamp
6. Integrated check synchroniser and synchronisation unit (2-channel)
7. Integrated power controller
8. Load distribution
9.
Integrated cos φ controller
10. Sealable power failure protection. The following can be monitored:
11. Static undervoltage/overvoltage
12. Overvoltage as an average value over 10 minutes
13. Static underfrequency/overfrequency
14. In addition to the requirements in accordance with
VDE-AR-N 4105:
15. Vector shift
16. Voltage and frequency change du/dt and df/dt
17. Control of a diesel motor in accordance with
VdS 2100-22:2008-11
.
18. Battery monitor and four additional analogue inputs for direct recording of analogue sensors
19. Control of two alarms via limit values for each analogue input
20. Two potential-
free analogue outputs, e.g. for direct control of speed, cos φ or other controllers
21. Parameterisation via LWL or USB interface
– automatic switching – or direct via the keys and the display
22. Two CAN bus interfaces
23. Diverse expansion options: Modem, pressure control, Profibus coupling, etc.
6.
Function differences to the preceding model KEA 102 PA
The automatic system is primarily designed for the use of multi-module systems. All functions are optimally
implemented for this use. However, it can also be used in single systems. Additional functions of the KEA 201
SPL are provided because of the VDE specifications concerning mains parallel operation. Thus, compared with
the previous model KEA 102 PA, functional deviations occur.
As no input is provided for peak load operation for the control designed for the parallel operation of gensets
among themselves, different functions are activated due to the sequence of the
MAINS IS ON
and
START COMMAND
signals.
7.
Automatic operation
7.1.
Back synchronisation
Back synchronisation can be carried out by an external control. If the mains (external) has been synchronised to
do this after standalone operation, the load of the consumers is slowly transferred to the mains. The external
control can then remove the start command for a required low load of the genset so the generator switches off
and the genset shuts down after the run-on time. If the start command is still pending, the system switches to
peak load operation.
7.2.
Peak load operation
The sequence of the signal transmission of start command and mains coupling on specifies this functional
process. If the start command is issued with a mains coupling on signal available, peak load operation is imme-
diately started. If the mains coupling on signal is issued after the start command pending (the system is in
standalone operation), the back synchronisation is first initiated by transferring the consumer load to the mains
and then switches to peak load operation when the start is still pending.
