GPC, PPU
Option O1, Water turbine control
DEIF A/S
Page 14 of 19
Turbine regulation
Relay controls
Because the regulation of bigger water turbines is relatively slow, some maximum regulation
settings are increased:
•
Maximum synchronisation failure timer (menu 2061) is increased to 3000.0 s.
•
Relay output period time (menu 2252) is increased to 32500 ms.
Analogue controls
The analogue output(s) can handle up to 4 analogue outputs for control valves and/or voltage
regulator. This is adjusted in the menu 4950.
The output combinations are shown in the table:
Option D1 NOT selected
Option D1 selected
Function
Output
Cascade
Voltage control
Cascade Voltage
control
Output 66/67
X X
Output 70/71
X
X
Output 91/92
X X
Output 95/96
X
Not
available
X
Analogue control valves, parallel w. mains generator
The cascade works like this:
At turbine start, all outputs are 0mA. As the speed/load set point increases, the cascade #1 will
give increasing signal until reaching 20mA. At this point, cascade #2 will take over and increase
its output until 20mA, and so on. When the turbine is stopped the sequence is reversed.
The output sequence looks like this in a situation where all cascades open:
If analogue outputs are needed, then order option E1 for two analogue outputs
and option E1 + F1 for 4 analogue outputs in total.
