SW1 / SW2
• DESCRIPTION
SW1 and SW2 are the configurable settings for the analogue governor output and analogue AVR
output included on DSE synchronising and load sharing controllers.
As the input requirements of governors and AVRs vary from manufacturer to manufacturer, and
even from model to model, the DSE module is configurable to allow connection to many devices.
The analogue governor and AVR outputs are both isolated from ground and battery negative,
allowing compatibility with devices with inputs that are not referenced to ground or battery
negative.
• SW1
SW1 is also known as Centre. SW1 sets the voltage produced by the DSE module’s output for
‘nominal’. For example SW1 = 0 for the governor output, means that the analogue governor output
will be 0V DC when the engine is required to run at it’s nominal speed.
• SW2
SW2 is also known as Range. SW2 sets the amount of ‘swing’ around the Centre (SW1) voltage
produced by the DSE module’s output for change. For example SW2 = 1 for the governor output,
means that the analogue governor output will be made to change by up to 1V DC either side of the
Centre (SW1) voltage to make the engine run at lower or higher speeds or to increase/decrease
load share.
• Settings
SW1 setting
0
1
2
3
4
5
6
7
8
9
‘centre’ voltage of
analogue output
0V
0.5V
1.0V
1.5V
2.0V
2.5V
3.0V
3.5V
4.0V
4.5V
SW2 setting
0
1
2
3
4
5
6
7
8
9
Voltage range of
analogue output
±0.5V
±1.0V
±1.5V
±2.0V
±2.5V
±3.0V
±3.5V
±4.0V
±4.5V
±5.0V
Typical wiring diagrams and SW1/SW2 selector settings for many of the most popular governors are included within the DSE guide
to synchronising and Load Sharing (Part2).
Continued overleaf.....
056-057 SW1 and SW2 Issue 2 – A.D.Manton
• Summary
Example of governor settings for SW1 and
SW2 in 86xx Configuration Suite Software
Example of governor settings for SW1 and SW2 in 75xx
and 5xxx Configuration Software
You can think of the settings as Analogue output voltage is SW1 ± SW2
In the example above this means the analogue output is 1.0V ± 1.5V (based upon the settings of
SW1=2 and SW2=2
SW1 is the voltage above (or below) 0V that the analogue output will produce to instruct ‘no
change’ to the voltage/frequency of the genset.
SW2 is the maximum voltage above (and below) SW1 that the analogue output will produce to
instruct the voltage/frequency of the genset to change.
SW2 (Range)
SW1 (Centre)
SW2 (Range)
0V DC
056-057 SW1 and SW2 Issue 2 – A.D.Manton