Kongsberg Simrad MF90, Installation Manual

Page: 182 / 426

180
476671/B
The gate valve is manufactured by Meson. For more detailed information about the gate
valve and the Gate Valve Control Unit, refer to the technical documentation provided by the
manufacturer.
How it works
When the gate valve is open, the limit switch "NC" on the is also open. Once the gate
valve leaves the "open position" (starts to close) the "NC" limit switch is also closed. This
makes optocoupler U7 close too, sending "Inhibit" to the CPU on the Hoist Control circuit
board. The transducer can then not be lowered.
U2 is "closed" when the transducer is fully retracted. The ground level from pin 19 in the
Gate Valve Control Unit is then passed to pin 3, and the relay between pins 2 and 3 (in the
Gate Valve Control Unit) is then activated. Pin 6 is +24 VDC. When activated, this relay
allows the gate valve to close. U2 is "open" when the transducer is not fully retracted up,
this is anywhere between fully lowered and "almost up". The relay between pins 2 and 3 in
the Gate Valve Control Unit is then deactivated. This prevents the gate valve from closing.
If you loose power in the Motor Control Unit while the transducer is lowered, U2 will be
kept"open" due to the lack of power. This will cause the relay between pins 2 and 3 in the
Gate Valve Control Unit to deactivate. This prevents the gate valve from closing.
Minimum cable requirements
•
Conductors
: 4 x 0.75 mm
2
•
Screen
: None
•
Voltage
: 60 V
•
Maximum outer diameter
: Not applicable
Related topics
Cable layout and interconnections, page 143
Cable plans, page 145
Installing the MF90 cables, page 154
Cable drawings and specifications, page 164
Simrad MF90 Installation Manual