Maintenance manual
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12.
Troubleshoot Hydraulic Lock Alarm (Only AS02)
The alarm Hydraulic Lock is made by four signals, two from the steering control system and two from
the Steering Gear control valves. All signals are connected in the pump motor controller, at unit U2,
input 17, 18, 19 and 20.
Input 17 and 18 is from the steering system opto-couplers, and 19 and 20 from the pump control
valve proximity switch. Additionally, the limit switches will disconnect input 17 & 18 at end position
via aux. relays (early version) or a relay module (later version).
Operate the steering from bridge and check the following signals:
NO RUDDER COMMAND
PORT RUDDER COMMAND
STBD RUDDER COMMAND
Led 17
–
OFF
Led 18
–
OFF
Led 19
–
ON
Led 20
–
ON
Led 17
–
ON
Led 18
–
OFF
Led 19
–
OFF
Led 20
–
ON
Led 17
–
OFF
Led 18
–
ON
Led 19
–
ON
Led 20
–
OFF
Input is active when corresponding led is ON. Any other condition will activate hydraulic lock alarm
after a 5 second delay.
If input 17 or 18 are missing, aux. relays/relay module should be checked, as well as the rudder
command signal from the optocouplers located on the pump control card.
If signals 19 of 20 are irregular, the proximity switches should be checked. These are located in the
control valve’s end housings. Follow chapter
11.26 Replacement of Proximity Switch
If all above checks are found correct, and input 19/20 are still irregular, the proximity switch itself
may be the cause. The proximity switch should therefore be replaced as a complete unit.
The order part number of the proximity switch is:
44771
