DANGER!
You must complete all the previous commissioning steps before closing the breaker to the live busbar. You
must be sure that the phase sequences on either side of the breaker match. You must be sure that the
voltage across the breaker is 0 V for each phase when synchronised. You must be sure that the breaker
opening, closing and feedback is wired correctly.
For each breaker on each controller, to check the synchronisation:
1. Activate switchboard control.
2. Enable and/or unlock the breaker.
3. For a GENSET controller, use the switchboard Manual GOV increase and Manual GOV decrease controls to synchronise
the genset to the busbar. For the other controller types, adjust the speed of the genset(s) connected to the busbar until
the busbar is synchronised with the equipment. Ensure that the generator voltage is also close to the busbar voltage.
4. Use the switchboard instrument or a synchroscope to confirm the synchronisation.
5. As the synchronisation enters the synchronisation window, press the breaker close button on the switchboard. Did the
breaker close?
• Yes: Continue commissioning.
• No: Troubleshoot the breaker wiring. Alternatively, a sync check relay may have prevented the breaker close if the
synchronisation was outside the synchronisation window.
5.3.2 Checking de-loading
To check the de-loading:
1. Activate switchboard control.
2. For a GENSET controller, use the switchboard Manual GOV increaseand Manual GOV decrease controls to reduce the
load on the genset. For other controller types, adjust the speed of the genset(s) connected to the busbar until the breaker
is de-loaded.
• If you cannot use the switchboard controls to de-load the breaker, then:
◦ Check the connection between the switchboard controls and the governor.
◦ Check if the governor is working correctly.
◦ Check the droop in the system (see the next section for more information.)
3. When the breaker is de-loaded, press the switchboard breaker open button. Did the breaker open?
• Yes: Continue commissioning.
• No: Troubleshoot the breaker wiring.
5.4 Droop
5.4.1 Controller types
The information in this section only applies to GENSET controllers.
5.4.2 Introduction to droop
The droop percentage for a genset governor is a measure of how much the genset power output changes when there is a
change in the engine speed. Similarly, for a genset AVR, the droop percentage shows the relationship between the reactive
power output and the generator voltage.
The following definitions for droop are used in this document:
PPU 300 Commissioning guidelines 4189341106 UK
www.deif.com Page 39 of 75
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