Wiring precautions

Wiring precautions

General The safety system must be wired in accordance with EN60204-1. This section gives a description of the rules for wiring and mechanically protecting cables. The entire safety system, the Safety Sensor & Emergency Stop Devices (SS ESDs) or Position Switchs (PSs), TSXPAY262 module, protection fuses and auxiliary relays are incorporated in housings with an IP54 minimum protection index as per EN954-1.

Grounding The module has no grounding terminal on its front panel. Depending on the TSXCPP•02 cable being used, the 0Vdc can be grounded (see EN60204-1) directly via the TELEFAST ABE-CPA13. NOTE: The TSXCPP301 cable has no ground connection.

Protection of safety system Errors within the safety modules can be propagated to the 'outside of the module, particularly to the external supply in use: short circuits within the module can cause a supply voltage avalanche or a supply malfunction if it is not protected. This is why a 1 A (gL) quick-blow fuse is placed in the control section of the relays, because the maximum consumption is 200mA. NOTE: This fuse, F1, is an active element of the safety system. The module also contains a current limiting device set to 750mA to detect inter-channel short circuits on the SS ESDs or PSs. The external supply is protected in the event of this happening, and a detected error is indicated on the safety system. In order

To guarantee the safety function, it is compulsory to use the following:  On the input  double contact SS ESDs or PSs  NF contacts of the guided-contact auxiliary relays in the feedback loop  On the output  two or four guided-contact auxiliary relays  a 4 A gL output protection fuse, F2  On the external module supply: a 1 A (gL) protection fuse F1

Protection of safety outputs Output voltages can reach 230Vac or 127Vdc. Outputs are not protected inside the module, though GMOV-type (for a continual load), or RC celltype (for an alternating load) protection is applied directly to the terminals of the load in use. These protective measures must be adapted to the load. The use of guided-contact auxiliary relays and feedback loop wiring makes it possible to detect a safety output short circuit. A 4 A (gL) quick-blow fuse is located in the auxiliary supply circuit to protect the module’s safety relay contacts and the connected loads: this fuse is identical to that used in PREVENTA modules. The fuse F2, located on the safety outputs, provides protection against short circuits and overloads. This protection avoids melting of the safety relay contacts in a TSXPAY262 module.