5.3 Speed droop
5.3.1 Speed droop
The speed governor must have a speed droop of 3-4% (speed dropping 3-4% from no load to full load, when
the Multi-line 2 is not in control). In order to ensure equal load sharing on parallel running machines, all gov-
ernors must have the same droop setting.
DEIF recommends adjusting the speed droop on the speed governor for stability purposes.
It is necessary in all cases when relay outputs for governor control is used.
When analogue interfacing is used, it is possible to operate with a speed droop adjustment of
0%, but for safety reasons it is recommended to use the speed droop adjustment.
5.4 Speed range
5.4.1 Speed range
When using the analogue interfacing, the resistor installed across the output terminals is selected to obtain
the necessary speed range. When finding the correct resistor, several aspects must be considered.
The necessary speed range must be selected, so it is possible to operate at full load. Typically, this is f
NOM
+3 Hz. If the speed range is too high, the resistor size must be decreased. If the speed range is too low, the
resistor size must be increased.
The speed range must allow for the full load of the genset. If full load cannot be reached, then
the resistor size must be increased.
5.5 Terminals
5.5.1 Terminals
The governor can either be prepared for analogue interfacing or digital interfacing. When analogue interfacing
is used, a +/-25 mA or 0-20 mA signal from the Multi-line 2 is applied. This signal can be converted to the
necessary voltage level. When digital interfacing is used, two relays are used as increase/decrease outputs.
The terminals must be identified depending on the necessary interfacing. Some general examples are shown
in the following illustrations.
5.5.2 Digital interfacing
Motor potmeter
General guidelines for commissioning
4189340703 UK
Governor check
DEIF A/S Page 14 of 25
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