08028-0D/H5250/94.08.12
1635436-4.2
Page 1 (2)
Converter for Engine RPM Signal
B 19 13 1
General
Engine RPM signals
For measuring the engine's RPM, a pick-up mounted
on the engine is used giving a frequency depending
on the RPM. To be able to show the engine's RPM
on an analogue tachometer, the frequency signal is
sent through an f/I converter (frequency/current
converter), where the signal is transformed into a
proportional 4-20 mA ~ 0-1200 RPM.
Both tachometer on the engine and possibly external
tachometers should be connected in the current
loop.
Further, the converter has following signals:
–
overspeed
–
engine run
–
safe start
–
tacho fail
Overspeed
When the engine speed reach the setpoint for
electronic overspeed the converter gives a shutdown
signal and a alarm signal through a relay.
94.04
Engine run
When the engine speed reach 710 RPM the conver-
ter gives a "engine run" signal. The signal will also
be given when the engine speed reach 200 RPM +
8 sec., (this is used for pump engines).
The engine run signal will be deactivated when the
speed is 640 RPM. If the engine speed haven't been
over 710 RPM the signal will be deactivated at 200
RPM.
The "engine run" signals will be given through a relay.
One for synchronizing and one for start/stop of pre.
lub. oil pump or alarm blocking at start/stop.
Safe start
When the safe start signal is activated the engine
can start. When the engine reach app. 140 RPM the
air starter will be shut-off.
Further, the safe start signal is a blocking function
for the air starter during rotation.
Fig. 1. Converter for engine RPM.
Summary of Contents for L28/32H
Page 4: ......
Page 5: ...Introduction I 00...
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Page 11: ...Designation of Cylinders In Line 98 19 1607568 0 1 Page 1 1 I 00 15 0...
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Page 19: ...General information D 10...
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Page 37: ...Basic Diesel Engine B 10...
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Page 45: ...99 40 B 10 01 1 L28 32H Cross Section 1607528 5 2 Page 1 1...
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Page 59: ...1607566 7 1 Page 1 1 Engine Rotation Clockwise B 10 11 1 General 98 18...
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Page 61: ...Fuel Oil System B 11...
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Page 79: ...Lubrication Oil System B 12...
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Page 91: ...Cooling Water System B 13...
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Page 113: ...Compressed Air System B 14...
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Page 119: ...Combustion Air System B 15...
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Page 126: ...Fig 1 Jet system 1639456 5 0 Page 2 2 Lambda Controller 93 44 L28 32H B 15 11 1...
Page 127: ...Exhaust Gas System B 16...
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Page 147: ...Speed Control System B 17...
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Page 153: ...Monitoring Equipment B 18...
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Page 159: ...Safety and Control System B 19...
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Page 177: ...Foundation B 20...
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Page 183: ...Test running B 21...
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Page 187: ...Spare Parts E 23...
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Page 191: ...99 35 1607521 2 6 Page 1 1 Recommended Wearing Parts E 23 04 0 L28 32H...
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Page 195: ...Tools P 24...
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