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Frequency Input from
These barriers provide a very
simple method of measuring and providing a speed control signal for a rotating
machine or motor. An I.S. inductive proximity sensor
is used to pick up the rotating part.
The sensor provides the input to the
barrier, which can be set for underspeed or overspeed detection giving a relay
output for trip or other control. It also provides a 0/4-20mA output for use as a
control signal to say, an inverter speed control unit or simply to display the
speed in a control room panel display or locally on a field-mounted digital display.
barrier shown here also has its own digital display which is very convenient for
many commissioning and re-start situations .
line monitoring for wire-break/short-circuit (ON/OFF mode)
isolation of input circuits, output circuits and supply voltage
speed monitoring for over/underspeed and window function
of sensors acc. to EN60947-5-6 (NAMUR)
of 3-wire sensors and external voltage supply 5 … 30VDC
2 relay and
1 transistor outputs
output 0/4…20 mA reversible
Intrinsically safe pulse output
output adjustable with faults in the input circuit
with diagnostic function
for storing of the measured values
operating voltage (20…250VAC/ 20…125VDC)
isolation of input circuits to output circuits and supply voltage