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.

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

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

And

Then

The encoder is using a 5 VDC supply

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

Use a wire with minimum cross-section 0.08 mm (gage 28)

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

Use a wire with minimum cross-section 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:

If

Then

The encoder supply voltage is 10…30 VDC

The protective fuse is built into the TELEFAST:

  • size: 1A

  • type: fast-blow fusion.

The encoder supply voltage is 5 VDC

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

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

No return encoder supply

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