Installation & applications

  1. Select a suitable shaft to install the ‘Rotech’ unit to.
  2. Use a 5mm drill to drill a pilot hole to a depth of 25mm into the centre of the end of the shaft.
  3. Use a 10mm drill to open the hole to the required tapping size.

IMPORTANT! Take care that the shaft is drilled centrally.

  1. Tap the 10mm X 25mm deep hole 12mm UNC.
  2. Remove the rear cover the Motion Sensor/Encoder and using a 10mm UNC socket wrench install the unit onto the shaft. Re-fit the rear cover.
  3. Bolt the flexible securing strap to any convenient part of the machine frame work

As an alternative method of securing the Rotech end of shaft unit without the need for drilling the
shaft, our unique Magcon unit can be used as shown below – see product data sheets for full

For quick and easy installation of Rotech shaft mounted sensors & encoders

  1. Always complete the mechanical installation before commencing the electrical installation.
  2. Install a suitable junction box within 300 – 600mm of the Motion Sensor/Encoder.
  3. Gland – Off the flexible conduit of the Motion Sensor/Encoder in the junction box and connect
    the 2 or 3 wires to suitable terminals. (The flexible conduit and cable are supplied over-length
    they can be cut back and shortened as required)
  4. Connect suitable wires and cable to route the Shaft Encoder signal back to the control panel.

The maximum distance recommended between the Motion Sensor/Encoder and the control
panel is 1000 yards.
Armoured or screened cable should be used id the cable is routed in the vicinity of power
Do not route the Motion Sensor/Encoder signal through multi-core cables carrying other
signals or voltages.

Alternative Installation

An alternative method of installation is to house the Control Module/Speed Relay etc. in a slightly larger terminal box.

A mains signal (typically 110Vac) can then be switched on by the control module and then routed via multi-cores; unprotected cables etc. back to the control panel.

Motion Sensors/Encoders are used extensively in many different industries for a wide variety of

Besides measuring the speed of a rotating shaft, they can determine direction of rotation, angular
position, and the number of revolutions or parts of revolutions completed.

Using screws, slides, racks & pinions these angular functions can be translated into linear or length

The following are the more popular applications that ‘Rotech’ Heavy Duty Motion Sensors/Encoders are utilised for.

Speed Indication

Used in conjunction with a Digital Panel Meter to display RPM or linear speed of a Conveyor Belt.

Length Measurement

Used in conjunction with a Counter unit and either a roller or wheel of known circumference, to
measure cut-off lengths, total throughput, or to position material for a process operation.

Direction Indication

Using a ‘Rotech’ Heavy Duty Motion Sensor/Encoder with dual quadrature outputs, direction of
rotation can be determined.
This is most frequently used to detect if a heavily loaded conveyor starts to run backwards.

N 2 wire – NAMUR intrinsically Safe-Hazardous Areas 8.2 VDC  
E 3 wire 10 – 30 VDC – NPN transistor – current sink  
E2 3 wire 10 – 30 VDC PNP transistor – current source  
E3 3 wire 10 – 30 VDC NPN/PNP transistor (Sink/Source)  
E4 2 wire 10 to 36 VDC – NPN/PNP transistor (Sink/Source) bipolar (Can be used in place of E3 type)  
E3Q 4 wire 10 – 30VDC – 2x NPN/PNP Transistor (Sink/Source – Quadrature Configuration)  
NQ 2x 2 wire – N Type (as shown above) – Quadrature Configuration  
EQ 2x 3 wire – E Type (as shown above) – Quadrature Configuration  
E2Q 2x 3 wire – E2 Type (as shown above) – Quadrature Configuration  
W 2 wire, 20 – 240 VAC/DC (Max Switching Frequency 25Hz AC, 100Hz DC)  

Rotech sensor output type E, E2, E3

Connect a 0 to 30vdc voltmeter between brown and blue connections
Voltmeter should indicate D.C. Supply voltage of between 10 and 30vdc
Now Connect the voltmeter between the black and blue connections.
Rotate Rotech unit very slowly, voltmeter should indicate on/off pulses between 0vdc and the nominal
Supply Voltage (Supply Voltage Minus 1 To 2 Vdc)

Rotech sensor type N

Connect a 0 to 10ma multimeter in series with the blue wire connecting the Rotech unit to it’s control circuit
rotate the Rotech unit very slowly, multimeter should indicate on / off pulses of less than 1ma to greater than 3ma.
See note * 1 below

Rotech sensor type W

Connect a 0 to 240vac voltmeter between the brown connection and 0 vac, verify the supply voltage is present.
Now connect the voltmeter between the blue connection and 0 vac.
Rotate the Rotech unit very slowly, the voltmeter should indicate on / off pulses of between 0v and the supply voltage.
See note * 1 below

Note * 1
  • At higher speeds the meter will not respond quickly enough to the on / off pulses. It will display an average value between
    The max and min levels.
  • The number of on / off pulses
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