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3BUS208796-001數(shù)字量輸入輸出卡
接地故障跳閘在隔離或高阻抗接地系統(tǒng)中，如果：?當(dāng)前不存在其他故障?接地故障保護(hù)已啟用?GF抑制時(shí)間（參數(shù)75）已過期?GF電流等于或大于GF跳閘水平（參數(shù)73）的時(shí)間段大于GF跳脫延遲（參數(shù)74），則SMC Flex控制器跳閘并顯示接地故障（GF），鐵芯平衡電流傳感器通常用于檢測(cè)由絕緣擊穿或異物進(jìn)入引起的低電平接地故障。檢測(cè)此類接地故障可用于中斷系統(tǒng)，以幫助防止進(jìn)一步損壞，或提醒相關(guān)人員及時(shí)進(jìn)行維護(hù)。SMC Flex控制器的接地故障檢測(cè)功能需要使用外部傳感器。外部傳感器允許您啟用接地故障跳閘、接地故障報(bào)警或兩者。對(duì)于5…480 A設(shè)備，建議使用Cat傳感器。用于1…5 A鐵芯平衡接地故障保護(hù)的825-CBCT鐵芯平衡電流互感器。對(duì)于625…1250 A設(shè)備，此處列出了推薦的傳感器，并提供5…25 A芯平衡接地故障保護(hù)。?制造商：Flex Core?描述：600V額定電流互感器?目錄號(hào)：126-252?CT比率：2500:5接地故障報(bào)警
在以下情況下，SMC Flex控制器指示接地故障報(bào)警：?當(dāng)前不存在警告
?啟用接地故障報(bào)警
?GF抑制時(shí)間（參數(shù)75）已過期
?GF電流等于或大于Gnd Flt A Lvl（參數(shù)77）熱敏電阻/PTC保護(hù)SMC Flex控制器提供端子23和24，用于連接
正溫度系數(shù)（PTC）熱敏電阻傳感器。
PTC傳感器通常嵌入電機(jī)定子繞組中以監(jiān)測(cè)電機(jī)繞組溫度當(dāng)電機(jī)繞組溫度達(dá)到PTC傳感器的溫度時(shí)溫度額定值，PTC傳感器的電阻從低到高價(jià)值由于PTC傳感器對(duì)實(shí)際溫度作出反應(yīng)，因此增強(qiáng)了電機(jī)可以提供保護(hù)以解決冷卻受阻等情況以及高環(huán)境溫度。熱敏電阻/PTC保護(hù)SMC Flex控器提供端子23和24，用于連接正溫度系數(shù)（PTC）熱敏電阻傳感器。PTC傳感器
通常嵌入電機(jī)定子繞組中以監(jiān)測(cè)電機(jī)繞組
溫度當(dāng)電機(jī)繞組溫度達(dá)到PTC傳感器的溫度時(shí)溫度額定值，PTC傳感器的電阻從低到高
價(jià)值由于PTC傳感器對(duì)實(shí)際溫度作出反應(yīng)，因此增強(qiáng)了電機(jī)可以提供保護(hù)以解決冷卻受阻等情況
以及高環(huán)境溫度。在以下情況下，SMC Flex控制器跳閘并顯示PTC指示：
?目前不存在其他故障
?PTC保護(hù)已啟用端子23和24之間的電阻大于繼電器響應(yīng)電阻或小于短路跳閘電阻。
過度啟動(dòng)/小時(shí)SMC Flex控制器允許您對(duì)每個(gè)小時(shí)（最多99小時(shí)）。這有助于將重復(fù)啟動(dòng)引起的電機(jī)壓力降至最低在短時(shí)間內(nèi)。
Ground Fault Trip
The SMC Flex controller trips with a ground fault (GF) indication if: ? No other fault currently exists ? Ground fault protection is enabled ? GF Inhibit Time (Parameter 75) has expired ? GF Current is equal to or greater than the GF Trip Level (Parameter 73) for a time period greater than the GF Trip Delay (Parameter 74) In isolated or high impedance-grounded systems, core-balanced current sensors are typically used to detect low-level ground faults that are caused by insulation breakdowns or entry of foreign objects. Detection of such ground faults can be used to interrupt the system to help prevent further damage, or to alert the appropriate personnel to perform timely maintenance. The ground fault detection capabilities of the SMC Flex controller require the use of an external sensor. The external sensor lets you enable Ground Fault Trip, Ground Fault Alarm, or both. For 5…480 A devices, the recommended sensor is a Cat. No. 825-CBCT core balance current transformer for 1…5 A core-balanced ground fault protection. For 625…1250 A devices, the recommended sensor is listed here and provides 5…25 A core-balanced ground fault protection. ? Manufacturer: Flex-Core ? Description: 600V Rated Current Transformer ? Catalog Number: 126-252 ? CT Ratio:2500:5 Ground Fault Alarm The SMC Flex controller indicates a Ground Fault Alarm if: ? No warning currently exists ? Ground fault alarm is enabled ? GF Inhibit Time (Parameter 75) has expired ? GF Current is equal to or greater than the Gnd Flt A Lvl (Parameter 77)
Thermistor/PTC Protection
The SMC Flex controller provides terminals 23 and 24 for the connection of positive temperature coefficient (PTC) thermistor sensors. PTC sensors are commonly embedded in motor stator windings to monitor the motor winding temperature. When the motor winding temperature reaches the PTC sensor’s temperature rating, the PTC sensor’s resistance transitions from a low to high value. Because PTC sensors react to actual temperature, enhanced motor protection can be provided to address such conditions as obstructed cooling and high ambient temperatures.
The SMC Flex controller trips with a PTC indication if: ? No other fault currently exists ? PTC protection is enabled The resistance across terminals 23 and 24 is either greater than the relay’s response resistance or less than the short-circuit trip resistance. Excessive Starts/Hour The SMC Flex controller lets you program the allowed number of starts per hour (up to 99). This helps minimize motor stress caused by repeated starting over a short time period.
