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Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,

Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

VMIVME-7666-111000 Gas turbine electrical module

Loop powered intrinsically safe detectors (e.g. most smoke, heat and manual call points) have two wire connection. The detector documentation will indicate the positive and negative loop connections. Multiple detectors may be connected in parallel on a single loop input provided the IS criteria and loop operational limit for quiescent current are not exceeded. In the safe area, the two wires from the detector should be connected to the field (hazardous area) side of the barrier. The input (safe area) side wires from the barrier should be connected to the appropriate channels IN+ and IN- terminals of the Hex Relay Interface Card that is attached to the required 5704F Control Card. The loop current always flows from the IN+ terminal and returns via the IN- terminal. The barrier must be earthed appropriately. For fault monitoring purposes an end of line (EOL) resistor must be fitted in or after the last detector on the loop. The typical value for end of line resistance is 5.1k ohms. When using an external barrier the IS compatibility link for the input must be set appropriately. Intrinsically safe systems must be earthed at one point only. All detector cable screens should be connected separately to the IS safety ground.

Separately Powered Detectors

 Separately powered detectors (e.g. most IR, UV/IR Flame detectors) require three or four wire connections. The detector documentation will indicate the 0V and +24V power connections and the positive and negative loop connections. When using flame detectors it is common practice to use only one detector per loop input. At the System 57 end of the field cables the two detector signal wires should be connected to the appropriate channels IN+ and IN- terminals of the Hex Relay Interface Card that is attached to the required 5704F Control Card. The loop current always flows from the IN+ terminal and returns via the IN- terminal. The power for the detector may be sourced from the System 57 power supply or a separate field supply, whichever is most appropriate. In small systems, power can be obtained from terminals 35 and 36 of the Hex Relay Interface Card, but care must be taken not to exceed the maximum backplane current loading of 8A. A separate dc power distribution block is recommended. For fault monitoring purposes, an end of line (EOL) resistor must be fitted in or after the last detector on the loop. The typical value for end of line resistance is 5.1k ohms.