ID-DCU-MARINE-2.2.2, ©ComAp – June 2015 - 140 -
ID-DCU-MARINE-2.2.2.pdf
ID-RPU will leave all own binary outputs in the last state when ID-DCU MARINE fail is detected (engine
stays running after ID-DCU MARINE fail). ID-RPU activates corresponding binary outputs when Emergency
stop, Engine overspeed protection or some Shutdown input (not in EME mode or Sd override), is activated.
ID-RPU overspeed setting
ID-RPU Overspeed limit is set via two DIP switches: Prefix and Speed preset.
OT switch in On (1) position activates Overspeed Test = Reduce Overspeed limit to 50%.
Example of Prefix and Speed preset calculation:
Required over-speed limit: RPMover = 1600 RPM
Basic settings: Gear teeth = 120
Speed preset formula: N = { [ ( RPMover x Gear teeth) / 60 ] / C } + 1;
1. Step: X = ( RPMover x Gear teeth) / 60 = 3200;
2. Step select coefficient C according table and corresponding DIP Prefix:
Table 1.
X = 3200 is in the range 2016 to 8128 -> C = 32; Prefix = 1000;
3. Step: Speed preset = 3200 / 32 + 1 = 101; -> 01100101 in binary format.
4. Step: set Prefix = 1000 and Speed preset = 01100101;
Table 2. Another examples of overspeed setting
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