Sperry Marine Rudder Angle Indicator System, Operation, Installaion And Service Manual

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RAIS 056357/B
Normal Operational Mode 2-1
Chapter 2: Operation
The RAC possesses no user-accessible controls. Once installed and
properly configured, it will take up operation unattended, as soon as
power is applied to the RAIS.
Likewise, no special procedures need to be followed to power off the
system. The RAC may be safely switched off at any time and will reboot
into normal operational mode as soon as it is switched on again.
2.1 Normal Operational Mode
When power is applied, the RAC boots up and enters the normal opera-
tional mode within a few seconds.
The unit applies in- and output calibration according to the stored cali-
bration tables at all times.
If no errors are present, the only noticeable effect of the RAC being
included in the RAIS, will be an increased accuracy in comparison to
conventional systems.
To alert the operator when the RAC is powered off or an alarm condition
is present, in most installations, the “Power Fail. / Gen. Alarm” relay will
be connected to an alarm indicator or central alarm panel.
Note Regularly check the indication of the RAIs against the actual position of
the rudder angle shaft to make sure that calibration is applied properly
and the specified accuracy is maintained.
Note
A given alarm system may employ reverse output logic (closed on
alarm). In this case, powering off the RAC will not raise an alarm.