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 Page 365 of 521
To Next Page
Loading...
