產(chǎn)品詳情介紹
UR8LH綜合保護(hù)繼電器
如果遠(yuǎn)程編程功能失敗或者不小心調(diào)整，使輸出電壓編程為高于額定值15%以上的電平，可能會損壞輸出濾波器電容器。為了防止這種情況，建議使用過壓保護(hù)選項(xiàng)來限制最大電壓偏移并安全關(guān)閉電源。通過外部電阻進(jìn)行遠(yuǎn)程編程遠(yuǎn)程編程電路中的開路實(shí)際上是一個(gè)高編程電阻，將導(dǎo)致電壓或電流失控上升至電源的最大輸出。這可能會損壞電源和/或負(fù)載。因此，任何編程電阻開關(guān)必須具有短路觸點(diǎn)。這種短路開關(guān)在斷開前一個(gè)位置之前連接每個(gè)連續(xù)位置。外部電壓遠(yuǎn)程編程在此操作模式下，前面板電壓或電流控制被禁用。電壓通道（電壓程序），（圖5）0至5V的電壓將輸出從零編程到全額定電壓。1.拆除端子TB3-3、4和5之間的跳線。2.在TB3-4（位置）和TB3-7（負(fù)極）之間連接編程電壓源。電流通道（電壓程序），（圖6）0到100毫伏的電壓將輸出從零到滿額定電流編程。注：來自更高電壓源的信號可通過電阻分壓器衰減至100毫伏。為了獲得最佳性能，該分配器的源阻抗不得超過1000歐姆。1.拆除端子TB3-9、10和11之間的跳線。2.連接程序
外部電流遠(yuǎn)程編程
在此編程模式下，前面板電壓或電流控制未禁用。前面板控件必須保持在順時(shí)針位置，以保持編程常量或輸出信號。0-1 mA的電流將輸出從零電壓編程為電壓通道的全額定電壓或電流程序（圖7）。1.拆除端子TB3-3和4之間的跳線。2.在端子TB3-4（位置）和TB3-7（負(fù)極）之間連接編程電流源。并聯(lián)操作注意：未經(jīng)用戶在電子測量工程部的咨詢下進(jìn)行徹底評估，不建議并聯(lián)操作三個(gè)以上的EMHP電源。這將有助于避免因電源不穩(wěn)定而導(dǎo)致的任何應(yīng)用故障。最簡單的并聯(lián)是將正極和負(fù)極端子連接到各自的負(fù)載點(diǎn)。程序如下：1.打開所有裝置（開路），并調(diào)整至合適的輸出電壓。2.關(guān)閉電源，將所有正極輸出端子連接至負(fù)載的正極，將所有負(fù)極輸出端子連接到負(fù)載的負(fù)極。注：連接裝置與負(fù)載的單個(gè)引線必須等長且尺寸過大，以提供盡可能低的阻抗。3.順時(shí)針設(shè)置電流控制。
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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