Aggregate Control Unit GENCON II pro - DSL electronic ® GmbH

IOB1
CONTROL CUBICLE
BAT -
#1
GENCON II
PICK-UP
ANALOG OUT
C12 BAT -
#1 THIS CONNECTION MAKES THE METALLIC CUBICLE
A SHIELD AGAINST CAPACITIVELY COUPLED NOISE
GOVERNOR
BAT -
MAGNETIC PICK-UP
#3 CABLE SHIELDS SHOULD BE CONNECTED AT ONE SIDE ONLY
#2 THE CONTROL CUBICLE GROUND IS
THE GOVERNOR BAT- TERMINAL
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- +
NOISE VOLTAGE ACROSS THIS WIRE
GEN-SET
Easy: Disconnect B12 PICK-UP and B22 ANALOG OUT from the governor and leave just B11 and B21
connected.
Magnetic Pickup Input
The magnetic pickup produces an AC voltage with every flywheel/gear tooth passing next to its coil. The
magnetic pickup input, B11-B12 PICK-UP, detects AC signals starting from approximately 0.5 Vrms
(± 0.7 volts peak to peak).
The system calculates the engine speed (RPM) and the generator frequency (Hz) from the MPU frequency,
based on the number of flywheel teeth and the number of generator field poles defined in SET-UP/BASICS. The
MPU measurements are displayed by MEASURE\ENGINE. The system also measures the generator frequency
directly from the V1 phase input. It declares a warning fault if there is a difference between the two readings.
When the MPU is used only by GENCON II, use a twisted pair shielded cable as follows:
Connect B11 and B12 to the pick-up coil. Connect the shield to B13 only.
When the MPU is also used by the electric governor, if you did not make the governor battery(-) terminal the
reference ground for the controller leave B12 not connected. See Ground Noise Hazards.
IMPORTANT NOTE:
Controllers that were manufactured before
20 Feb. 94 (last unit s/n A50 4 02 028) are
very sensitive to the pickup AC signals (their
circuit works by counting zero crossings). In
some cases this lead to detection of spurious
frequencies.
The simplest solution is to add a small DC
offset to the magnetic pickup AC signal:
B11 MPU+
B12 MPU-
+24V BAT
10K ohm
Typical
Magnetic Pickup
Resistance
85 ohm
NOISE SIGNAL
NOISE SIGNAL
The example uses the magnetic pickup coil intrinsic 85Ω resistance to
add a 0.2 Vdc bias to the pickup signal. AC signals smaller than ± 0.2
volts are ignored.
ANALOG OUT
This voltage source controls the engine speed and fuel through the electric governor external reference input:
Connect B21 to the positive reference input (there are sorts of names for it: "AUX", "ILS", etc.).
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NOISE SIGNAL
AFTER ZERO CROSSING DETECTION
NOISE SIGNAL
AFTER ZERO CROSSING DETECTION