Deif PPU 300 - Breaker; Checking the Phase Sequence

5.2 Breaker
5.2.1 Checking the phase sequence
Controller types: The information here applies to ALL controller types.
DANGER!
The phase sequence across the breaker MUST be checked and correct before the breaker is closed for the
first time. A phase sequence error is extremely dangerous and can result in personal injury or death, and
serious equipment damage.
Check the phase sequence for one controller at a time:
1. Requirements for each controller type:
• For a GENSET controller, the genset must be running.
• For a SHAFT generator controller, the shaft generator must be running.
• For a SHORE connection controller, the shore connection must be available.
• For a BUS TIE breaker controller, there must be voltage on both busbars.
2. There must be voltage on the busbar to check the phase sequence.
• If there is no voltage on the busbar, you can connect one generator to the black busbar. Check the phase sequence
across the breaker. If the voltage measurements are wired incorrectly, the controller will activate a phase sequence
error. If there is no phase sequence error, keep the generator connected to the busbar to check the phase sequence for
the other controllers.
3. Check that the phase sequence at the equipment (1) is the same as the phase sequence at the controller voltage
measurement points (2).
L1
L1
L2
L2
L3
L3
N
N
ACM3.1
V
BB-L1
V
BB-L2
V
BB-L3
V
L1
V
L2
V
L3
L2L1 L3
Controlled
equipment
Breaker
Phase
sequence
meter
1
2
4. Check that the phase sequence at the busbar (1) is the same as the phase sequence at the controller voltage
measurement points (2).
PPU 300 Commissioning guidelines 4189341106 UK
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