FOXBORO FCM10E P0914YM通信模塊
如第7頁至第13頁的接線圖所示，這些輸出位于端子25至28，共用端子24。應(yīng)使用屏蔽電纜，僅屏蔽一端接地，以盡量減少噪聲影響。信號和電源電路是內(nèi)部隔離的，允許以不同于PQM的接地電位連接到設(shè)備（PLC、計(jì)算機(jī)等）。然而，每個端子都被箝位至接地±36 V。2.2.8模擬輸入（可選）端子22（–）和23（+）用于電流信號輸入。該電流信號可用于監(jiān)測任何外部量，如變壓器繞組溫度、電池電壓、電站服務(wù)電壓、變壓器抽頭位置等。0至20 mA范圍內(nèi)的任何傳感器輸出范圍均可連接至PQM的模擬輸入端子。有關(guān)模擬輸入編程的詳細(xì)信息，請參見第29頁第4.3.3節(jié)：模擬輸入。
As shown in wiring diagrams on pages –7 to –13, these outputs are at Terminals 25 to 28 and share Terminal 24 as their common. Shielded cable should be used, with only one end of the shield grounded, to minimize noise effects. Signals and power supply circuitry are internally isolated, allowing connection to devices (PLCs, computers, etc.) at ground potentials different from the PQM. Each terminal, however, is clamped to ±36 V to ground. 2.2.8 Analog Input (Optional) Terminals 22(–) and 23(+) are provided for a current signal input. This current signal can be used to monitor any external quantity, such as transformer winding temperature, battery voltage, station service voltage, transformer tap position, etc. Any transducer output ranges within the range of 0 to 20 mA can be connected to the analog input terminals of the PQM. See Section 4.3.3: Analog Input on page –29 for details on programming the analog input.
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