Design and theory of operation
20169223D 3-9
alarm voltage is regulated to 15V DC by the regulator Q2, and the
LED LD1 indicates presents of voltage.
During normal operation, the relay K1 will be energized, thus
connecting the 15V regulated mains voltage as alarm supply. In the
event of a mains power failure, the alarm voltage will be connected
as supply via the deenergized K1 relay.
The alarm relay K2 is energized by an alarm signal from the control
unit (alarm = GND)
THRUSTER INTERFACE BOARD
(For detailed diagram, refer to SCHEMATICS)
The Thruster Interface Board is identical in size with the
Interconnection Board, but includes one ±10V analogue signal or one
4-20mA current signal output, both galvanic isolated.
There is also a 10 kHz generator to provide feedback signal to the
Control Unit in order to enable the ±10V analogue signal from the
control unit.
1
0
1
0
1
0
1
0
1
2
34
2
3
1
1
0
SW11
10 kHz
Osc.
FEEDBACK TO CONTROL UNIT
BUFFER & CURRENT GENERATOR
(ISOLATED OUTPUT)
RV15
RV13
RV14
4-10mA
TB
+/-10V
+/-10V
JUMPER SWITCH
SW1
BUS
Fig. 3-10
Thruster Interface PCB - Simplified diagram
The jumper switch SW11 selects either a feedback signal via the bus
connector or the 10 kHz signal to be applied to the control unit. For
the 10 kHz signal, the jumper switch shall be set in position "0"
(shorting pin 2 and 3).
The resulting ±10V signal from the control unit is then applied to the
Buffer & Current generator.
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