Table 10.9
Shaft generator breaker open sequence for PTH
SGB open
signal
< Open
when power
below
No
Yes
Zero pitch input
configured
No
Yes
Zero
pitch input
ON
No
Yes
Open SGB
SGB open
No
Yes
SGB opened
Info message
Info message
Alarm
Open point
enabled
No
Yes
1.
Open point enabled:
The controller checks the
Open point enabled
parameter:
•
Enabled
: Is the PTH power less than
Open when power below
?
◦
Yes
: The controller continues the sequence.
◦
No
: The controller displays the
Load on SG too high
info text, and
stops the sequence.
•
Not enabled
: The controller continues the sequence.
2.
Zero pitch input configured:
The controller checks whether the
Zero pitch
input is configured:
•
Configured
:
◦
Activated
: The controller continues the sequence.
◦
Not activated
: The controller displays the
Pitch not zero
info text,
and stops the sequence.
•
Not configured
: The controller continues the sequence.
3.
Open SGB:
The controller activates the breaker
Open
output.
4.
SGB open:
The controller checks whether the SGB has opened.
•
If the SGB has opened, the sequence has been completed
successfully.
•
If the SGB has not opened, then the
SGB open failure
alarm is
activated.
INFO
Be careful when setting the
Open point
parameter, since driving the ship transmission and propeller (even at zero pitch)
requires a significant amount of power.
INFO
The PTH function stops if an alarm condition (for example, over-current) trips the shaft generator breaker. In this case, the
breaker trip will occur even if the zero pitch input is configured and is not activated.
10.4.2 Shaft generator base load
The SHAFT generator controller allows the ship to generate power from a ship's main engine, while topping up the power
requirement by running one or more generators in parallel. This function is enabled under
Parameters > Local power
management > Shaft generator base load
.
When
Shaft generator base load
is enabled, then these alarms are not active:
DESIGNER'S HANDBOOK 4189340911K UK
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