ID-DCU-MARINE-2.2.1
, ©ComAp – January 2015
- 138 -
ID-DCU-MARINE-2.2.1r2.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 over speed protection or some Shutdown input (in
AUX
mode only), is activated.
ID-RPU over speed setting
ID-RPU Over speed limit is set via two DIP switches: Prefix and Speed preset.
OT switch in On (1) position activates Over speed Test = Reduce Over speed 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 range
C
Prefix
2016 to 8128
32
1000
504 to 2032
8
0100
126 to 508
2
0010
1 to 127
0,5
0001
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
RPMover
Gear teeth
Prefix
Speed preset
DIP8
1800
150
1000
141
10001101
1800
120
1000
113
01110001
1800
60
0100
226
11100010
1000
30
0010
251
11111011
Speed preset binary conversion examples
Speed preset DIP8
0
00000000
1
00000001
2
00000010
4
00000100
8
00001000
16
00010000
32
00100000
64
01000000
128
10000000
255
11111111
