This document describes a diesel engine speed measuring system that uses multiple circuit cards to measure engine and turbocharger speed, convert the speed signals to proportional voltages, and control relays at adjustable speed setpoints. The system can measure one or two turbocharger speeds in addition to engine speed. It uses hall effect sensors to measure speeds and has provisions for simulating engine speed. Relay cards allow for control of devices based on the measured speeds.
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GENERAL FEATURES
Measuring the engine speed
Measuring 1 or 2 T/C speeds
Up to 7 separately adjusted relay functions
set at any engine speed
Engine speed simulation
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Small Dimensions, Easily mounted.
Clear functions, each on separate cards.
Easily adjusted or readjusted.
No moving parts.
Few Components, Clear troubleshooting.
Galvanically insulated Supply.
Characteristics
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Converts 24 V, 48 V, 110 V DC voltage to
regulated +/- 12 V DC for internal supply.
Accepts input varying between 18- 40 V &
40-160 V
Galvanic Isolation between input & output.
Healthy output indication by a Green LED.
1.6 A fuse for over-voltage protection.
Short circuit proof internal supply (Imax=
500mA)
C1 - DC/DC CARD
Back Photo
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Converts frequency signal from engine
speed sensor to proportional DC
voltage output.
VASA 22 :
0 - 1500 RPM 0 - 950 Hz 0 - 10 VDC.
VASA 32 :
0 - 1000 RPM 0 - 417 Hz 0 - 10 V DC
One tacho relay normally used as a
start fuel limiter.
Relay Status indicated by one LED.
Adjustable switchpoint & time delay
between 0 - 100%range & 0-10 seconds.
C2 - nDE CARD
Back Photo
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5 tachometers can be connected in parallel
to the output of the card.
Simulation of engine speed,
Unplug engine speed sensor
Short two pins marked TP3.
C2 - nDE CARD
Back Photo
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C3 - RELAY CARD
Provided with 3 independently adjustable
tacho-relay channels.
Each channel has one LED for an
indication of relay state.
All relays are adjustable between 0 - 100 %
of speed measuring range.
A delay of 0 - 30 sec is possible with extra
arrangements.
Back Photo
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C3 - RELAY CARD
First relay is normally adjusted to 300
RPM. Used for prelub. pump control,
hour counter control, alarm & stop
blockings.
Second relay is normally adjusted at 560
RPM for excitation & breaker operation
control.
Third relay is used for overspeed
protection. The relay is activated at
15 % overspeed & releases the stop
function.
Back Photo
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C4 - nTC CARD
Converts the frequency from one or two
T/C speed sensor(s) to proportional DC
voltage output.
· VASA 22 : 0 - 50,000 RPM 0 - 10 V DC.
· VASA 32 : 0 - 30,000 RPM 0 - 10 V DC.
T/C speed read on engine tachometer by
switching speed selector to T/C position.
Output of this card can support more
than one external meter.
Back Photo
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C5 - RELAY CARD
C3 & C5 are identical cards.
Can be used in place of C3 with
appropriate settings.
Can also be used for additional switch
points based on engine or T/C speed.
Back Photo
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Turbocharger Speed Sensor.
Works on magnetic induction principle.
Outputs one sine wave for every passage of
every pair of magnet.
Sensor Distance 2 - 3 mm.
SPEED SENSORS
Engine Speed Sensor
Works on inductive proximity switch principle.
Outputs 12 V pulse for every passage of the
teeth in the sensing area.
Distinct signal also at low engine rotational
speed.
Sensor Distance 2.5 mm.
Back
Photo
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