Specifications

Wattmetric control
This wattmetric control will be activated after a global operation delay. This global operation enables the application to be resumed
after power is restored to the different outputs, and ensures stability of the load before the wattmetric control is started.
Depending on the power for the application, the number of generating sets in production may vary in order to optimise the
production to consumption.
The procedure is as follows:
• End of the global operation delay.
• Start of analysis of the active power consumed.

Example: A generating set must be stopped according to the set thresholds.
• Power cut at the non-priority generating set, transfer of the power to the generating set(s) remaining in production.
• Uncoupling of the non-priority generating set, at zero power, by switching on the generating set power unit.
• Cooling delay.
• Generating set stopped and set to standby.
 Example of increase in power:
• Generating set start request.
• The generating set increases in speed.
• Alternator excitation, the generating set establishes its voltage.
• Request for synchronisation of the generating set to the bus bar (i.e. the other coupled generating sets).
• Generating set power unit switched off.

Return of grid voltage
• Grid return acquisition delay (controlled by the mains detection module).
• Generating set power units switched on.
• Cooling delay.
• Generating sets stopped and set to standby.
The Kerys PLCs remain in “AUTO” mode
FORCED OPERATION
Start of FORCED OPERATION
•
Generating set power units switched off.
• Generating set start request.
• The generating sets increase in speed.
• Speed stabilisation delay.
• Order of excitation for each generating set at nominal speed; the voltage is then quickly established on the busbar.
• Start of active power distribution.
• Resumption of application at rated voltage and frequency.
The Kerys PLCs remain in “AUTO” mode
The installation is supplied by the generating sets
End of FORCED OPERATION
• Generating set power units switched on.
• Cooling delay.
• Generating sets stopped and set to standby.
The Kerys PLCs remain in “AUTO” mode
The installation is supplied by the grid
Manual power plant operation
This mode of operation is selected with the “MANU” key. This enables the operator to start and stop the generating sets one by one
via the MMI keypad. The generating set power unit is switched off manually with synchronisation of each generating set to the
busbar using the MMI keys “+F”, “-F”, “+V” and “-V”. The distribution of power among the generating sets remains automatic.
The
safety devices of the generating sets remain active in this mode of operation.
This mode of operation is the responsibility of the operator.
77/285