8.4 Interface Description 8 Technical Reference
740 Speed sensor
A proximity sensor of inductive type according
to Namur standard is giving a number of pulses
per revolution of the bowl (see Connection List).
Signal processing in STARTING:
• The separator should be stopped automatically
according to NORMAL STOP procedure
and an alarm should be given when the
accumulated time for acceleration is longer
than the maximum time specified in Technical
Data. An abnormal start time indicates some
malfunction of the separator equipment and
should be investigated.
• If the speed exceeds “Bowl speed, synchronous”
in Technical Data with more than 5% the
separator shall be stopped automatically by
NORMAL STOP and a high speed alarm shall
be given.
• The speed monitoring system shall be checked
continuously (e.g. by checking that pulses
are coming). In case of failure indication the
separator shall be stopped automatically by
NORMAL STOP with a timer controlled stop
sequence and an alarm for speed monitoring
system failure shall be given.
• The acceleration should be supervised to
ensure that a certain speed (e.g. 250 r/min.)
has been reached within a certain time (e
.g. 30
seconds).
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