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3BUS208796-001数字量输入输出卡
接地故障跳闸在隔离或高阻抗接地系统中，如果：•当前不存在其他故障•接地故障保护已启用•GF抑制时间（参数75）已过期•GF电流等于或大于GF跳闸水平（参数73）的时间段大于GF跳脱延迟（参数74），则SMC Flex控制器跳闸并显示接地故障（GF），铁芯平衡电流传感器通常用于检测由绝缘击穿或异物进入引起的低电平接地故障。检测此类接地故障可用于中断系统，以帮助防止进一步损坏，或提醒相关人员及时进行维护。SMC Flex控制器的接地故障检测功能需要使用外部传感器。外部传感器允许您启用接地故障跳闸、接地故障报警或两者。对于5…480 A设备，建议使用Cat传感器。用于1…5 A铁芯平衡接地故障保护的825-CBCT铁芯平衡电流互感器。对于625…1250 A设备，此处列出了推荐的传感器，并提供5…25 A芯平衡接地故障保护。•制造商：Flex Core•描述：600V额定电流互感器•目录号：126-252•CT比率：2500:5接地故障报警
在以下情况下，SMC Flex控制器指示接地故障报警：•当前不存在警告
•启用接地故障报警
•GF抑制时间（参数75）已过期
•GF电流等于或大于Gnd Flt A Lvl（参数77）热敏电阻/PTC保护SMC Flex控制器提供端子23和24，用于连接
正温度系数（PTC）热敏电阻传感器。
PTC传感器通常嵌入电机定子绕组中以监测电机绕组温度当电机绕组温度达到PTC传感器的温度时温度额定值，PTC传感器的电阻从低到高价值由于PTC传感器对实际温度作出反应，因此增强了电机可以提供保护以解决冷却受阻等情况以及高环境温度。热敏电阻/PTC保护SMC Flex控器提供端子23和24，用于连接正温度系数（PTC）热敏电阻传感器。PTC传感器
通常嵌入电机定子绕组中以监测电机绕组
温度当电机绕组温度达到PTC传感器的温度时温度额定值，PTC传感器的电阻从低到高
价值由于PTC传感器对实际温度作出反应，因此增强了电机可以提供保护以解决冷却受阻等情况
以及高环境温度。在以下情况下，SMC Flex控制器跳闸并显示PTC指示：
•目前不存在其他故障
•PTC保护已启用端子23和24之间的电阻大于继电器响应电阻或小于短路跳闸电阻。
过度启动/小时SMC Flex控制器允许您对每个小时（最多99小时）。这有助于将重复启动引起的电机压力降至最低在短时间内。
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.
