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UR8LH综合保护继电器
如果远程编程功能失败或者不小心调整，使输出电压编程为高于额定值15%以上的电平，可能会损坏输出滤波器电容器。为了防止这种情况，建议使用过压保护选项来限制最大电压偏移并安全关闭电源。通过外部电阻进行远程编程远程编程电路中的开路实际上是一个高编程电阻，将导致电压或电流失控上升至电源的最大输出。这可能会损坏电源和/或负载。因此，任何编程电阻开关必须具有短路触点。这种短路开关在断开前一个位置之前连接每个连续位置。外部电压远程编程在此操作模式下，前面板电压或电流控制被禁用。电压通道（电压程序），（图5）0至5V的电压将输出从零编程到全额定电压。1.拆除端子TB3-3、4和5之间的跳线。2.在TB3-4（位置）和TB3-7（负极）之间连接编程电压源。电流通道（电压程序），（图6）0到100毫伏的电压将输出从零到满额定电流编程。注：来自更高电压源的信号可通过电阻分压器衰减至100毫伏。为了获得最佳性能，该分配器的源阻抗不得超过1000欧姆。1.拆除端子TB3-9、10和11之间的跳线。2.连接程序
外部电流远程编程
在此编程模式下，前面板电压或电流控制未禁用。前面板控件必须保持在顺时针位置，以保持编程常量或输出信号。0-1 mA的电流将输出从零电压编程为电压通道的全额定电压或电流程序（图7）。1.拆除端子TB3-3和4之间的跳线。2.在端子TB3-4（位置）和TB3-7（负极）之间连接编程电流源。并联操作注意：未经用户在电子测量工程部的咨询下进行彻底评估，不建议并联操作三个以上的EMHP电源。这将有助于避免因电源不稳定而导致的任何应用故障。最简单的并联是将正极和负极端子连接到各自的负载点。程序如下：1.打开所有装置（开路），并调整至合适的输出电压。2.关闭电源，将所有正极输出端子连接至负载的正极，将所有负极输出端子连接到负载的负极。注：连接装置与负载的单个引线必须等长且尺寸过大，以提供尽可能低的阻抗。3.顺时针设置电流控制。
If the remote programming function fails
or is inadvertently adjusted so that the output voltage is programmed to levels of greater than 15% above ratings, damage to the output filter capacitors may occur. To protect against this, it is suggested that the overvoltage protection option be used to limit the maximum voltage excursion and safely shut the power supply down. Remote Programming by External Resistance An opening in the remote programming circuit is effectively a high programming resistance and will cause an uncontrolled voltage or current rise to the maximum output of the power supply. This may cause possible damage to the power supply and/or the load. For this reason, any programming resistor switches must have shorting contacts. This type of shorting switch connects each successive position before disconnecting the preceding one.Remote Programming by External Voltage The front panel voltage or current control is disabled in this operating mode. Voltage Channel (Voltage Program), (Figure 5) A voltage of 0 to 5V programs the output from zero to full rated voltage. 1. Remove the jumpers between terminals TB3-3, 4 and 5. 2. Connect the programming voltage source between TB3-4 (pos) and TB3-7 (neg.).Current Channel (Voltage Program), (Figure 6) A voltage of 0 to 100 Millivolts programs the output from zero to full rated current. NOTE: A signal from a higher potential source may be attenuated to this 100mv level by a resistor divider. For best performance, the source impedance of this divider must not exceed 1000 Ohms. 1. Remove the jumpers between terminals TB3-9, 10 and 11. 2. Connect the progra
Remote Programming by External Current
The front panel voltage or current control is not disabled in this programming mode. The front panel control must be left in the clockwise position to maintain the programming constant or signal to the output. A current of 0-1 mA programs the output from zero voltage to full rated voltage or curren Current Program of Voltage Channel (Figure 7) 1. Remove the jumpers between terminals TB3-3 and 4. 2. Connect the programming current source between terminals TB3-4 (pos.) and TB3-7 (neg.).PARALLEL OPERATION NOTE: It is not recommended to operate more than three EMHP power supplies in parallel without thorough evaluation by the user with counseling from the Engineering Department of Electronic Measurements, Inc.. This will help avoid any failures in the application because of instability of the power supplies. The simplest parallel connection is that of attaching the positive and negative terminals to their respective load points. The procedure is as follows: 1. Turn on all units (open circuit) and adjust to appropriate output voltage. 2. Turn supplies off and connect all positive output terminals to the positive side of the load and all negative output terminals to the negative side of the load. NOTE: Individual leads connecting unit to the load must be of equal lengths and oversized to provide as low an impedance as practical. 3. Set the current controls clockwise.
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