When there is a problem with the grounding system(excessive grounding resistance,multi-point grounding,disconnection of the grounding wire or contact of the grounding wire with high-voltage,high-current equipment,etc.),it will cause electric shock injury to personnel and damage to equipment.It is understood that some DCS systems often”fail”(or”fail”for no apparent reason),mostly due to poor or problematic grounding systems.Therefore,perfect,reliable and correct grounding is the key to the safe,reliable and good operation of the DCS system.
当接地系统发生问题时(接地电阻过大,多点接地,接地线断线或接地线与高电压、大电流设备相接触等),会造成人员的触电伤害及设备的损坏,据了解,有些DCS系统经常“死机”(或不明原因的“死机”),大多是因为接地系统不良或存在问题所引起的。因此,完善、可靠、正确的接地,是DCS系统能够安全、可靠和良好运行的关键。
ALLEN BRADLEY 7300-UMA 634281-90 FEEDBACK MODULE
OMRON K3TX-VD22A DIGITAL METER GOOD TAKEOUT
RELIANCE ELECTRIC 0-52808-2 (OLVC) GOOD TAKEOUT
MITSUBISHI A38B-UL BASE UNIT 7 SLOT GOOD TAKEOUT
WEIDMULLER 8708670000 POWER SUPPLY (100-120 V) GOOD TA
VEXTA RKD514L-A 5-PHASE DRIVER GOOD TAKEOUT
OMRON CQM1-OD211 OUTPUT UNIT GOOD TAKEOUT
SIEMENS 6SE6400-7AA00-0BA0 MICROMASTER MM440 I/O MODULE
SIEMENS 3RX9307-0AA00 POWER SUPPLY AC 230/115 GOOD TAKE