FOXBORO P0904HW Digital input card

FOXBORO P0904HW Digital input card

Specific situations can be expected to arise that will not be adequately covered by the guidelines. These situations must be recognized and dealt with on an individual basis. a. Earth electrode subsystem. If the measured resistance of the earth electrode subsystem is greater than 10 ohms, identify the reason for the high resistance. Review the past record (if available) of earth resistance measurements for signs of gradual increases in resistance as well as sudden resistance changes. (Discard from consideration "zero" resistance reading and other similarly unobtainable values.) Examine the resistance readings for possible correlation with site changes. (1) Once the reason for the high resistance and local climatic conditions is established, determine the most appropriate method in terms of cost and ease of implementation for reducing the resistance. Typical alternatives include the use of more or longer ground rods, the installation of horizontal grids or wires, chemical salting, or the drilling of wells down to the permanent water table.

Main business of the company

1.Focus on DCS, PLC, robot control system and large servo system. Main products: various modules/cards, controllers, touch screens, servo drives.

2.Advantages: We supply imported genuine products, professional off production accessories, fast delivery and accurate delivery.

3.Main brands: ABB, GE/FANC, FOXBORO, Invensys TRICONEX, Bentley BENTLY, A-B Rockwell, Emerson, OVATION, MOTOROLA, XYVOM, Honeywell HONEYWELL, Rexroth, KUKA, NI, DEIF, Yokogawa, Woodward WOODWARD, Ryan, Schneider SCHNEIDER, Yaskawa, Moog, PROSOFT, etc

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