Recommendation for connections

RECOMMENDATIONS FOR CONNECTIONS OF THE INSTRUMENTATION AND INDUSTRIAL CONTROL PRODUCTS.  

 

MEASUREMENT CABLES (Low power signal cables are involved).  1. TC (PT 100, Ni 100, a.s.o.), Current (0-20, 4-20 mA).  Voltage (0-10 V, 0-5 V, a.s.o.), Digital inputs (dry contact, frequency or pulses inputs).  2. Those signals must be integrated in their own shoot or if it is not possible, must be installed far away from the other cables.  3. Those signals must be connected with standard shrouding cable (crossed internal wires and shrouded through metallic braid). They must be connected on a shortest way to the apparatus ground.

 

POWER SUPPLY CABLE. (The apparatus power supply cables are involved).  Voltage usually involved: 24, 48, 115, 230 V AC; 12, 24, 48, 110 V DC.Those power supplies must not directly come from the high power supplies (isolation transformer). It is recommended to avoid the connection mode phenomena to disconnect on the general transformer level, the power supply cables and the high power cables.

 

HIGH POWER CABLE. (The energies devices cables are involved).   Engines power supply heating resistances, electro valve, relaying, a.s.o Those cables represent the main source of industrial perturbations and must be then isolated in distinctive and closed shoot (Faraday cage)

 

PROTECTION It is necessary to dissociate the relaying areas from the measurement signals treatment areas.RC networks must be installed to the disruptive inductive device pins (relaying, electro valve, a.s.o….).

 

EQUIPOTENTIALITY. These apparatus grounds and the surrounding grounds must be connected together through short cables with big diameters. To grant a good potentiality of installation, it is necessary to increase the interconnection (ground networking).The shoots represent a good way to perform the interconnection between the cabinets, if electric connections are made with good care.It is recommended, during the installation of the cables (digital RS, 4-20 mA), to install, in the same time, a cable 35 mm² connected to the ground on its two extremities. These connections will make decrease the important potential differences occurred by lightning effects near on of those blocs. Engines power supply heating resistances, electro valve, relaying, a.s.o .Those cables represent the main source of industrial perturbations and must be then isolated in distinctive and closed shoot (Faraday cage).   

 

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