UFC911B106 3BHE037864R0106系统模块卡件
电源屏障本质安全齐纳二极管屏障#897H--S120建议用于FM认证和UL认证的位置。屏障详情见第8页。或者，用户必须选择自己的电源屏障。需要注意的是，5500系列控制器必须在42DTB 5500型电源底座的+和-端子上至少具有13V DC。13V DC下的电源电流为26 mA。然后，通过以下公式确定最大势垒电阻：Rb max=Vs-13 0.026，其中：Rb max=最大势垒电阻Vs=电源13=控制用最小电压0.026=电源电流（13V DC时最大26mA）负载电源势垒本质安全齐纳二极管势垒#897H-S120建议用于FM认证和UL认证的位置。屏障详情见第8页。或者，用户可以选择自己的负载供应屏障。当使用5500系列本质安全控制器的NPN（电流吸收器）开路集电极输出时，除电源屏障外，还必须选择负载电源屏障。最大负载供电屏障电阻可通过使用以下公式确定。用户必须提供负载电压降Vload和负载电流Iload（最大20 mA）的值：Rb最大值。Vs-Vload-3.4 Iload，其中：Rb max=最大势垒电阻Vs=电源电压V1oad=负载电压降3.4=输出电路电压降（3.4V）Iload=输出电流（最大20mA）源（PNP）仅输出本质安全齐纳二极管势垒#937ZH-DPCD-2建议用于FM认证和UL认证位置。或者，当5500系列本质安全控制器的PNP（电流源）开路集电极输出时，用户可以选择自己的信号返回屏障。对于非I类1区A和B组危险场所的PNP输出应用，除电源屏障和负载供应屏障外，还必须选择信号屏障。有关参考，请参阅三屏障PNP输出配置的控制图。
Power Supply Barrier Intrinsic safety zener diode barrier #897H--S120 is recommended for FM Approved and UL Listed locations. See page 8 for barrier details. Alternatively, the user must select his own power supply barrier. It should be noted that the Series 5500 control must have at least 13V DC at the + and - terminals of the power base, Type 42DTB Model 5500. The supply current at 13V DC is 26 mA. The maximum barrier resistance is then determined by the following formula: Rb maximum = Vs - 13 0.026 where: Rb max = Maximum Barrier Resistance Vs = Voltage Supply 13 = Minimum Voltage Supply to Control 0.026 = Supply Current (26mA max. at 13V DC) Load Supply Barrier Intrinsic Safety Zener Diode Barrier #897H--S120 is recommended for FM Approved and UL Listed locations. See page 8 for barrier details. Alternatively, the user may select his own load supply barrier. When using the NPN (current sink) open collector output of the Series 5500 Intrinsically Safe controls, a load supply barrier must be selected in addition to the power supply barrier. The maximum load supply barrier resistance can be determined by using the following the formula. The user must provide values for the load voltage drop, Vload, and the load current, Iload (20 mA maximum):Rb maximum. Vs - Vload - 3.4 Iload where: Rb max = Maximum Barrier Resistance Vs = Voltage Supply V1oad = Load Voltage Drop 3.4 = Output Cir. Voltage Drop (3.4V) Iload = Load Current (20mA max.) Signal Return Barrier for Source (PNP) Output Only Intrinsic Safety Zener Diode Barrier #937ZH-DPCD-2 is recommended for FM Approved and UL Listed locations. Alternatively, the user may select his own signal return barrier when the PNP (current source) open collector output of the Series 5500 Intrinsically Safe controls. For PNP output applications in hazardous locations not classified as Class I, Division 1, Groups A and B, signal barrier must be selected in addition to the power supply barrier and the load supply barrier. For reference, see Control Drawing for the three barrier PNP output configurations.
