Wiring rules and precautions specific to the TELEFAST

Wiring rules and precautions specific to the TELEFAST

Connecting or disconnecting the TELEFAST You should always connect or disconnect the TELEFAST’s connectors and various connection wires when the voltage is SWITCHED OFF:  connecting or disconnecting the cable connectors linking the module and the TELEFAST connector,  connecting or disconnecting the wires linking the TELEFAST connector to the encoder.

Length of the connection cable between the module and the TELEFAST The table below gives the clock frequency of the transmission series according to the distance.

Cross-section of the wire connecting the module and the TELEFAST In order to reduce the on-line voltage falls as much as possible, please respect the following points:

If then

cable length < to 10 meters frequency of the transmission series clock: 1 MHz cable length < to 20 meters frequency of the transmission series clock: 750 kHz cable length < to 50 meters frequency of the transmission series clock: 500 kHz

cable length < to 100 meters frequency of the transmission series clock: 375 kHz cable length < to 150 meters frequency of the transmission series clock: 200 kHz cable length < to 200 meters frequency of the transmission series clock: 150 kHz

If

The encoder is using a 5VDC supply And

The distance from the module to the TELEFAST is < 100m

The distance from the module to the TELEFAST is > 100m Then

Use a wire with minimum crosssection 0.08 mm (gage 28)

Use a wire with minimum crosssection 0.34 mm (gage 22)

Connecting the encoder supply In order to limit voltage falls with a 0V, caused by the encoder supply current, we recommend that you wire the 0V as follows:

Wiring the encoder outputs on the TELEFAST If the encoder outputs have positive or negative logic with a number lower than 24, use the following connection procedure:

If And Then

the encoder outputs have positive logic their number is lower than 24  wire the encoder outputs to the TELEFAST inputs, working from the least significant to the most significant

 wire the unused TELEFAST inputs to the 0V terminal

the encoder outputs have negative Logic their number is lower than 24  wire the encoder outputs to the TELEFAST inputs, working from the least significant to the most significant  do not wire (leave free) the unused TELEFAST inputs.

Protecting the encoder supply According to the encoder supply voltage, the supply should be protected as follows:

Monitoring the encoder supply If the encoder supply voltage decreases by more than 15%, the default (EPSR signal) is sent back to the module. If the encoder does not have a return supply, do the following:

If Then

The encoder supply voltage is 10…30VDC The protective fuse is built into the TELEFAST:  size: 1A  type: fast-blow fusion.

The encoder supply voltage is 5VDC Provide a series fuse (Fu) for the positive supply:  calibre: to be determined by the user, dependent upon the TELEFAST and encoder consumption  type: fast-blow fusion

If

No return encoder supply Then

Connect the positive and negative EPSR of the TELEFAST:  the positive EPSR terminal of the TELEFAST to the positive terminal of the encoder supply  the negative EPSR terminal of the TELEFAST to the negative terminal of the encoder supply