MOTOROLA MVME147S-1模块备件

MOTOROLA MVME147S-1

电阻器提供了连续监测开关电流的方法。信号
晶体管用于驱动开关2的栅极。它为开关2提供负栅极
电压，以小化其导通电阻，并用于在以下情况下保持开关2导通：
辅助门控制失去电源。
开关2的栅极和源极之间的齐纳二极管仅用于保护电源
栅极从漏极上的大电压尖峰开始，当
开关1和开关2处于断开状态。
与开关1的栅极和信号晶体管串联的电阻器用于保护电路
恶意开关故障时的驱动逻辑。上拉电阻器限定栅极
无电时的电压。
1.9.1.开关诊断
在正常操作期间，开关1和开关2保持接通。在此状态下，开关1
开关2表现出低电阻。
为了确定系统通过开关1和开关2控制负载的能力
一次一个地调制栅极电压。当栅极电压被调制时
监测信号以可预测的方式同步变化。本地DSP分析
这些小交流信号的相对振幅和相位来确定导通电阻
每个开关的阈值电压。
不需要完全中断到负载的电流以获得稳定的电流
晶体管关断能力的置信水平。对于TMR开关
在接通状态的配置中一次只需要调制一个故障安全开关，
而另外两个承受负载电流。
1.说明：可信TMR 24Vdc数字输出模块–40信道
1014期罗克韦尔自动化出版物ICSTT-RM280N-EN-P
1.9.2.短路保护
根据IEC 61131-2，输出信道被分类为受保护信道，特别是“受保护信道”
“产出和需求”。
通电时，监测通道输出电流以保护通道开关
防止因持续过流状况而造成损坏。在检测到持续过电流状况后，锁定短路故障状态，并使输出断电。
在断电时，输出可选择性地配置为检测短路场
故障（电阻小于24Ω) 通过System.INI文件配置。检测
断电时的短路依赖于励磁电路的部分通电
确定信道负载电阻。设计了磁场电路的部分激励
以将场电压或电流的任何变化分别限制为小于2V或100mA。
锁定短路故障状态可通过操作系统故障复位按钮清除
或者通过转换命令的信道状态。
输出还包括不可更换的熔断丝，以提供对保护。

MOTOROLA MVME147S-1

MOTOROLA MVME147S-1

A resistor provides a means of continuously monitoring the switch current. A signal transistor is used to drive the gate of Switch 2. It provides Switch 2 with a negative gate voltage, to minimize its on resistance, and serves to hold Switch 2 on in the event that the secondary gate control loses power. The Zener diode between the gate of Switch 2 and source is only required to protect the gate from large voltage spikes on the drain that might capacitively couple through when Switch 1 and Switch 2 are in the off state. The resistors in series with the gate of Switch 1 and the signal transistor serve to protect the drive logic in the event of a malicious switch failure. The pull-up resistors define the gate voltages in the absence of power. 1.9.1. Switch Diagnostics During normal operation, Switch 1 and Switch 2 are maintained on. In this state, Switch 1 and Switch 2 exhibit a low resistance. To determine the ability of the system to control the load via Switch 1 and Switch 2, their gate voltages are modulated, one at a time. As the gate voltages are modulated, the monitoring signals synchronously change in a predictable fashion. The local DSP analyses the relative amplitude and phase of these small AC signals, to determine the on resistance and threshold voltages of each switch. The current to the load does not need to be completely interrupted in order to obtain a level of confidence in the ability of the transistors to turn off. For the TMR switch configuration in the on state, only one fail safe switch at a time needs to be modulated, while the other two bear the load current. 1. Description Trusted TMR 24Vdc Digital Output Module – 40 Channel 10 Issue 14 Rockwell Automation Publication ICSTT-RM280N-EN-P 1.9.2. Short Circuit Protection Output channels are classified as protected under IEC 61131-2, specifically ‘Protected Outputs Requirements’. While energised, the channel output current is monitored to protect the channel switches from damage by a sustained over-current condition. Having detected a sustained overcurrent condition a short-circuit fault state is latched and the output is de-energised. While de-energised, the output may be optionally be configured to detect short-circuit field faults (resistance less than 24 Ω) through System .INI file configuration. The detection of short-circuits while de-energised relies upon a partial energising of the field circuit to determine the channel load resistance. The partial energising of a field circuit is designed to constrain any change in field voltage or current to less than 2 V or 100 mA, respectively. A latched short-circuit fault state can be cleared by operating the system Fault Reset button or by transitioning the commanded channel state. The output also includes a non-replaceable fusible link for absolute protection.