[问答]

两个N5751A提供并联输出从属单元不输出任何电流

问答对人有帮助，内容完整，我也想知道答案 0 我有两个N5751A电源配置，并联输出。从属单元不输出任何电流。输出电压设置为150 VDC，OVP处于上电默认值（300 VDC），UVL处于上电默认值（0 VDC），OCP禁用。主设备提供电源，但从设备没有电流输出。根据N5700用户指南第30至32页的说明，我将输出连接12 AWG电线，与电源输出大约相距12英寸。遥感具有连接到主设备的感测点（+ S，-S），然后是从主设备到从设备远程感测输入的并联连接。使用后面板J1连接器，有一个从主J1-25到从属J1-10的导线。从从机J1-8到从机J1-12有一根跳线。在主站上，SW1-5为UP，所有其他位置均为出厂默认DOWN。在从机上，SW1-2和SW1-5为UP。从属SW1上的所有其他位置都在因子默认DOWN中。使用限制按钮，我将主机上的电流限制设置为1.0 A.同样，在从机上我将电流限制设置为1.2 A当我启用主机和从机的输出时，我可以通过转动来增加输出电压主机上的电压调整**。从站上的显示表明其电压与主站相同。在从机上，由于从机SW1-2处于向上位置，电压调节和电流限制都没有任何影响。从属单元的电压不能独立于主单元设置（更高或更低），因为电压调整无效。当负载为0.50 A连接到电源的并联输出时，主显示器指示它正在输出电流。从属显示器指示电压，但当前值保持精确为0.两个电源上的恒定电压（CV）指示灯均亮起。主机和从机上的恒定电流（CC）指示灯均熄灭（未点亮）。两种供应品的PROT指标均已关闭。向上或向下改变负载需求对从站没有明显影响。从机不提供电流。在尝试调试时，我暂时将主设备和从设备分离。我确认每个电源在配置为独立（独立）电源时，能够将其全额定电流输入负载。我哪里错了？编辑：DNatrop于2014年12月12日下午4:06（错字）以上来自于谷歌翻译以下为原文 I have a configuration of two N5751A supplies with outputs wired in parallel. The slave unit is not outputting any current. The output voltage is set for 150 VDC, the OVP is at the power-on default (300 VDC), the UVL is at the power-on default (0 VDC), and OCP is disabled. The master delivers power, but there is no current output from the slave unit. Per the instructions on pages 30 to 32 of the N5700 Users’ Guide, I have the outputs wired with 12 AWG wire in parallel approximately 12 inches from the supply outputs. Remote sensing has a sense point (+S, -S) connected to the master and then a parallel connection from the master to the slave remote sense inputs. Using the rear panel J1 connector, there is a conductor from master J1-25 to slave J1-10. There is a jumper wire from slave J1-8 to slave J1-12. On the master, SW1-5 is UP and all other positions are in the factory-default DOWN. On the slave, SW1-2 and SW1-5 are UP. All other position on the slave SW1 are in the factor-default DOWN. Using the Limit button, I set the current limit on the master to 1.0 A. Likewise, on the slave I set the current limit to 1.2 A When I enable the outputs of both the master and slave, I can increase the output voltage by turning the voltage adjustment on the master. The display on the slave indicates that its voltage is the same as the master. On the slave, neither the voltage adjust nor the current limit have any effect since the slave SW1-2 is in the UP position. The voltage of the slave unit cannot be set independent of the master (higher or lower) because the voltage adjust ** has no effect. With a load of 0.50 A connected to the paralleled outputs of the supplies, the master display indicates it is delivering current. The slave display indicates a voltage, but the current value remains at exactly 0. The constant voltage (CV) indicators on both supplies are on. The constant current (CC) indicators on both the master and slave are off (not illuminated). The PROT indicators on both supplies are off. Changing the load demand either up or down has no apparent impact on the slave. The slave delivers no current. In trying to debug, I temporarily decoupled the master and slave. I verified that each supply, when configured as independent (stand-alone) power supplies, is capable of delivering their full rated current into my load. Where am I going wrong? Edited by: DNatrop on Dec 12, 2014 4:06 PM (typo) 0
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答案对人有帮助，有参考价值 0 问题解决了 - 操作员错误。根本原因是我们没有使用限制按钮编程从属单元电压电平来观察该值。由于从属电压显示跟踪主电压显示，似乎主机正在对从机进行编程。实际上，从机保持编程为零，因为在安全启动模式下，当设备通电时，编程的电压和电流水平为零。改变主电压电平可能会产生错误印象，即从机也被编程到该电平，而实际上从机被“卡住”在恒压（CV）模式下。在CV模式下，从站永远不会输出任何电流。通过按下从机的限位按钮，将电压设置调整到高于主机，设置电流限制并启用输出，从机将输出电流。虽然在用户手册中对此进行了解释，但没有迹象表明上述情况可能发生。此外，如果前面板未锁定，则转动从机+上的电压调节旋钮会改变编程值。除非按下限位按钮，否则从电压显示面板_不会指示编程值正在改变。可以将从机的电压旋钮向下转到从机退出恒定电流（CC）模式的位置。如果从机退出CC模式，返回CV模式，输出电流将降至零。我在原帖中声明转动电压调整知道“没有效果”是不正确的。旋钮确实有效果。除非按下限制按钮，否则用户不会看到数字更改。以上来自于谷歌翻译以下为原文 Problem solved – operator error. The root cause was that we did not program the slave unit voltage level using the Limit button to observe the value. It appeared that the slave was being programmed by the master since the slave voltage display tracks the master voltage display. In reality, the slave remained programmed to zero because in Safe Start mode, the programmed voltage and current levels are at zero when the units are powered on. Changing the master voltage level gives a possible false impression that the slave is also programmed to that level, when in fact the slave is “stuck” in Constant Voltage (CV) mode. In CV mode, the slave will never output any current. By pressing the slave’s limit button, adjusting the voltage setting higher than the master, setting the current limit, and enabling the outputs, the slave will then deliver current. While this is explained in the user’s manual, there is no indication that the scenario above could occur. Additionally, turning the voltage adjustment knob on the slave +does+ change the programmed value if the front panel is not locked out. The slave voltage display panel _does not indicate_ that the programmed value is changing unless the limit button is pressed. It is possible to turn the slave’s voltage knob down to the point where the slave drops out of Constant Current (CC) mode. If the slave drops out of CC mode, back to CV mode, the output current will drop to zero. My statement in the original post that the turning the voltage adjustment know has “no effect” is incorrect. The knob does have an effect. The user won’t see numbers change unless the limit button is pressed.

2018-11-16 10:58:47 评论举报冯待策