Focus on DCS, PLC, robot control system and large servo system.

Main products: various modules / cards, controllers, touch screens, servo drivers.

Advantages: supply of imported original products, professional production parts,

Fast delivery, accurate delivery time,

The main brands include ABB Bailey, Ge / fuanc, Foxboro, Invensys Triconex, Bently, A-B Rockwell, Emerson, ovation, Motorola, xyvom, Honeywell, Rexroth, KUKA, Ni, Deif, Yokogawa, Woodward, Ryan, Schneider, Yaskawa, Moog, prosoft and other brands

The detector cable screen or steel wire armour (or braid), as appropriate, should be connected to the system (protective) earth. This can be achieved where the cable enters the cabinet by using a metal cable gland, or by other suitable means, and avoiding any screen 'tails' within the cabinet. Where the cable consists of a separate screen sheath and wire armour (or braid), the armour should be connected, at the cabinet entry, to the protective earth and the screen sheath should be connected to the GROUND terminal of the Field Interface/Relay Card or to a suitable instrument earth point. Note: Where a detector is earthed locally, either to the Earth Stud or through the detector casing or mounting, to avoid earth loops the screen sheath of the cable should only be connected at one end, i.e., at the detector or at the Interface/Relay Card. 8.2 5701 Gas Card and Catalytic Type Detector Catalytic detectors require a three wire connection and the detector documentation will indicate three connections S, 01 and NS, which are usually brown, white and blue respectively. At the System 57 end of the field cable, the three detector wires should each be connected to the respective matching S, 01 or NS terminal on the Field Interface or Relay Card that is attached to the required Single Channel Display Card. NS S 01 29 28 27 Detector NS S 01 5701 Interface Card 8.3 5701 Gas Card and 2 Wire Loop Powered Detectors Loop powered detectors require a two wire connection and the detector documentation will indicate the positive and negative loop connections, usually brown and blue respectively. At the System 57 end of the field cable the two detector wires should each be connected to one of either the S, 01 or NS terminals on the Field Interface or Relay Card that is attached to the required Single Channel Display Card. The two terminals used will vary depending upon whether the location of the measuring resistance is in the loop supply or return paths. 9 System 57 Quick Start Guide 05701-M-5026 MAN0839 Issue 1 8.3.1 4-20mA loop powered detector (measuring resistor in supply return) 01 - + 28 27 Detector S 5701 Interface Card Sensor Drive Module Link Positions 13, 10 & 4. 8.3.2 4-20mA loop powered detector (measuring resistor in supply positive line) NS 01 - + 29 28 Detector 5701 Interface Card Sensor Drive Module Link Positions 9, 6 & 1. 8.4 5701 Gas Card and 3 Wire 4-20mA Transmitter CAUTION The power provided by the Single Channel Control Card is derived from the dc input to the System 57 (18V to 32V). Check that the transmitter to be connected is compatible with the actual supply voltage used. The maximum current that may be sourced from the field terminals of an individual Single Channel Control Card to power a field device is 500mA, however, the total current sourced from all the channels should not exceed the maximum backplane load current of 8A. 10 System 57 Quick Start Guide 05701-M-5026 MAN0839 Issue 1 Transmitters powered from the 5701 Control Card require either three or four wire connections and the detector documentation will indicate the 0V and +24V power connections and the positive and negative loop connections. At the System 57 end of the field cable the detector wires should be connected to the S, 01, NS, 0V or 24V terminals on the Field Interface or Relay Card that is attached to the required Single Channel Display Card. The exact terminals used vary depending upon whether three or four wire topology is used, and the requirement for loop current source or sink configuration. The Schematics below detail the connections for 3 wire current sink or source transmitters. For other schematics (including isolated and barrier) refer to operating manual 05701-M-5001.