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Transducer Instruction Manual

Range:

Advance

Type:

ACDF – 3

Revision:

V1.0

2.8

Hazardous Area Installation - Intrinsic Safety

CMC Controls tension transducers can be located in a hazardous area to provide an Intrinsically Safe

installation to EN 50039 when a proprietary Zener Barrier module, Part Number 4503, is used. Tension

transducers are passive components and are classified as simple apparatus by EN 50014. Strain gauge

transducers (load cells) will be damaged if subjected to the 500 volt insulation test required by EN 50020.

To comply with Intrinsic Safety regulations the body of the transducer must be bonded to the IS earth

using 4 square millimetre green/yellow insulated cable. Consult CMC Controls for more information.

NOTE It is the responsibility of the user to ensure that all relevant safety regulations are complied with.

The integrity of all connections particularly the earth should form part of any maintenance procedure.

2.9

Most web tension installations require two transducers, each supporting one end of the sensing roller

shaft and the transducer output signals are summed to give a measurement of Total tension. For those

installations where only one transducer is required a Dummy Transducer, Part Number 4431, may be

needed to complete the full Wheatstone bridge. For single transducer installations the MWF calculation,

see below, should be derated by a factor of 1.5, consult CMC Controls for more information.

The signal wiring between the transducer and the indicator or controller must be by screened cable

routed well away from any power wiring or other sources of interference.

The RED SPOT on the transducer specifies the output signal polarity in relation to the applied load

direction. Depending on the installation the transducer output signal can be positive or negative for

increasing load. Ensure the yellow and green output leads are connected to the indicator or controller

terminals correctly, so that they add to, rather than cancel each other. In most installations, one

transducer will give a positive signal the other a negative signal.

To confirm the connections to the indicator, switch on, unplug any one of the transducer connectors,

adjust the indicator zero control until the meter or display reads approximately zero. Apply a load to the

tension sensing roller in the same direction as the resultant web tension, the display should move

positive. If the display decreases or moves negative, reverse the appropriate yellow and green transducer

leads at the indicator terminals. Repeat for the other transducer.

When completed, reconnect both transducers.

_____________________________________________________________________________________________________________________

Absolute Measurement Ltd. (T/A CMC Controls)

t: (0) 1732 763278

| e:

Unit 19

| Silver Birches Business Park | Aston Road | Bromsgrove | B60 3EU

| w: absolutemeasurement.co.uk