GPC, PPU
Option O1, Water turbine control
DEIF A/S
Page 11 of 19
Water level above normal
When there is plenty of water in the reservoir, the transducer will give 20mA output. This means
that the power of the gen-set will be maintained at the P
SET
(menu 4041).
Water level below normal
Because the water level is below normal level, the power of the gen-set will be decreased
according to the slope of the transducer curve that is adjusted in the menu 404X/404X. In the
drawing below, the power will be adjusted from the set point ‘P
SET
‘ (menu 4041) and downwards
to 25%.
Operating range
The operating range of the turbine can be reduced in the lower end by adjusting the 4mA value
to a negative value. The power will not be regulated into the area where the water level is
negative. (The purpose of this is partly to avoid the generator to go into reverse power and partly
to keep the turbine in the economic operating range.)
The operating range of the turbine can be reduced in the high end by decreasing the P
SET
(menu
4041) to a lower value.
Power %
Water level %
100
50
50
100
150
200
-50
-100
250
Pset (4041)
Water set nom. (4044)
Water set min. (4045)
Ge
ne
ra
tor
pr
od
uc
ed
po
we
r
The regulation stops when the percentage of the water level goes negative. In
this example this means that the minimum output from the turbine is 25%.
Before the GPC/PPU enters the water level control it will go into the ramp up
sequence using the settings in menus 2141 and 2142.
