DCS系統(tǒng)接地是為了保證當(dāng)進(jìn)入DCS系統(tǒng)的信號、供電電源或DCS系統(tǒng)設(shè)備本身出現(xiàn)問題時,有效的接地系統(tǒng)能承受過載電流并可以迅速將過載電流導(dǎo)入大地。接地系統(tǒng)能夠為DCS提供屏蔽層,消除電子噪聲干擾,并為整個控制系統(tǒng)提供公共信號參考點(diǎn)(即參考零電位)。當(dāng)接地系統(tǒng)發(fā)生問題時(接地電阻過大,多點(diǎn)接地,接地線斷線或接地線與高電壓、大電流設(shè)備相接觸等),會造成人員的觸電傷害及設(shè)備的損壞,據(jù)了解,有些電廠DCS系統(tǒng)經(jīng)常“死機(jī)” (或不明原因的“死機(jī)”),大多是因為接地系統(tǒng)不良或存在問題所引起的。 因此,完善、可靠、正確的接地,是DCS 系統(tǒng)能夠安全、可靠和良好運(yùn)行的關(guān)鍵。
ALLEN BRADLEY EEPROM SPEICHERMODUL, 1747-M13
MITSUBISHI ELECTRIC OPERATION BOARD KS-MB401A, MB412A
SIMATIC S7, RAM MEMORY CARD, S7-400, 1 MBYTE, 6ES7952-1
REXROTH INDRAMAT INTERFACE MODULE, ESM02.3-FW
REXROTH INDRAMAT ECODRIVE R911279775, DKC06.3-040-7-F?W
REXROTH INDRAMAT ECODRIVE R911279775, DKC06.3-040-7-F?W
OMRON PROGRAMMABLE CONTROLLER CPU UNIT, CQM1H-CPU51
OMRON PROGRAMMABLE CONTROLLER CPU UNIT, CQM1H-CPU61
ALLEN BRADLEY LASTTRENNSCHALT?ER, 1494R-N100
ALLEN BRADLEY PRE-WIRED CABLE, 1492-ACABLE010V?B
ALLEN BRADLEY FIBER OPTIC CABLE, 2090-SCEP0-1
ALLEN BRADLEY INDUST. COMPACT FLASH 128MB, 1784-CF128
SEIDEL DIGIFAS SERVO DRIVE, DIGIFAS 7108-SPS
LENZE BEDIENMODUL KEYPAD 13153727, EMZ9371BC
ALLEN BRADLEY TERMINAL BLOCK, 1734-MB/A
ALLEN BRADLEY COMPACT I/O, 1769-CRL1
ALLEN BRADLEY ANALOG CURRENT INPUT MODULE, 1734-IE4C
MITSUBISHI IGBT MODULES, CM400HA-28H
ALLEN BRADLEY STRATIX 2000 ETHERNET MODULE, 1783-US8T