Parameter Range Default Notes
Low frequency limit
90 to 100 % of the nominal
frequency
91 %
The function starts the first priority genset if the shaft generator
frequency is below this set point for the Delay time.
High frequency limit
100 to 110 % of the nominal
frequency
109 %
The function starts the first priority genset if the shaft generator
frequency is above this set point for the Delay time.
Delay 0 to 10 s 0.5 s The delay time for the frequency set point.
Configure these parameters under Configure > Parameters > Local power management > Shaft generator f [Hz] variation >
Connect gensets.
Parameter Range Default Notes
Low frequency
limit
90 to 100 % of the nominal
frequency
90 %
The function synchronises and connects gensets to take over the
load if the shaft generator frequency is below this set point for the
Delay time.
High frequency
limit
100 to 110 % of the nominal
frequency
110 %
The function synchronises and connects gensets to take over the
load if the shaft generator frequency is above this set point for the
Delay time.
Delay 0 to 10 s 0.5 s The delay time for the frequency set point.
How it works
This function is only active when the SHAFT generator controller is under PMS control.
The Engine start parameters have the same effect as a Precautionary genset start.
The Connect genset parameters have the same effect as pressing the SHAFT generator controller Open breaker button. The
sequence is as follows:
1. The shaft generator frequency exceeds the Connect genset limit for the delay time.
2. The PMS starts the required number of gensets.
• The SHAFT generator controller and the GENSET controllers show operator information messages.
3. The gensets synchronise and connect, despite the shaft generator frequency.
4. The PMS regulates the gensets to de-load the shaft generator breaker.
5. The shaft generator breaker opens.
6. The PMS regulates the gensets so that the frequency returns to the nominal value.
10.4.5 Temperature-dependent power derating
More information
See GENSET controller, Other GENSET controller functions, Temperature-dependent power derating for a
description of this function.
10.4.6 Shaft generator fixed speed
Some shaft generators are capable of both variable and fixed speed. For these shaft generators, it is good practise to confirm that
the shaft generator is operating at fixed speed before connecting the shaft generator to the busbar. You can therefore configure a
digital input with the SG fixed speed function, to prevent the shaft generator breaker from closing if the shaft generator is not running
at fixed speed.
Input
Assign the input under Configure > Input/output. Select the hardware module, then select the input to configure.
DESIGNER'S HANDBOOK 4189340911K UK Page 367 of 521
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