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8 TECHNICAL REFERENCE 8.4 INTERFACE DESCRIPTION
There shall be an emergency stop circuit
designed according to EN 418 and a power
isolation device according to EN 1037.
There shall be a start button close to the
separator that shall be used for first start after
assembly of the separator.
There should be a counter to count number of
running hours.
There should be a current transformer to give
an analogue signal to the control unit about the
motor current.
740 Speed sensor
A proximity sensor of inductive type according
to DIN 19234 (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 250r/min.)
has been reached within a certain time (e.g
30 seconds).
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