1756-PA75R是一个冗余电源。此电源的功能与标准电源相似，只是此模块安装在机箱外部，并与目录号相同的冗余电源配对。
1756-PA75主要用于冗余操作，能够在冗余电源对之间实现自动机箱负载共享。它还安装有单独的状态指示器，以指示电源对的操作。它还有一个固态继电器，提供触点输出，当连接信号装置时，可用于指示电源状态。
构建一个冗余电源对，需要一对电源或两(2)个1756-PA75R、两(2)条冗余电源电缆(如1756-CPR2、1756-CPR2D和1756-CPR2U)、一(1)个冗余电源机箱适配器(目录号为1756-PSCA2、1756-PSCA2K或1756-PSCA2XT)和可选信号设备(如用于监控电源运行状态的信号器)
1756-PA75R在输入电压范围为85-265VAC、47-63 Hz，标称值为120VAC / 240VAC和50/60 Hz时运行。它的输入功率要求为120VA / 115 W，在0…+60°C(+32…+140°F)下工作时，输出功率额定值为75 W，在1.2 VDC下的电流容量为1.2 A；4A为3.3伏直流电；5.1伏直流电时为13安，24伏直流电时为2.8安。安装信号器装置时，推荐的信号器为240VAC 50/60 Hz，240V DC，50 mA，仅电阻式。
1756-PA75R的尺寸约为6.9 x 5.7 x 5.4英寸。该电源的重量约为3.2磅，该电源的报警器和导线类别分别为3类和1类。1756-PA75R的信号器线规格为22-14 AWG，在167°F下绞合，由铜制成。这个电源的导线尺寸是14 AWG。Allen-Bradley 1756-PA75R具有基于IEC 61000-4-5的浪涌瞬变抗扰度。该电源的浪涌瞬态抗扰度为1 kV线-线(DM ),在信号端口上为2 kV线-地(CM)。1756-PA75R的传导射频抗扰度为10 Vrms，1 kHz正弦波的80% AM范围为150 kHz至80 MHz。根据IEC / CISPR出版物11，1756-PA75R被视为1级A类设备。请记住，在适当的预防措施下，由于干扰和辐射，在其他环境中确保电磁兼容性可能存在潜在困难。
1756-PA75R
The 1756-PA75R is a Redundant power supply. The features of this power supply are similar to a standard power supply except that this module is installed outside of the chassis and paired with a redundant power supply partner of the same catalog number.
The 1756-PA75 is primarily used for redundant operation and capable of implementing automatic chassis load sharing between the redundant power supply pair. It is also installed with individual status indicator to indicate the operation of the power supply pair. It also has a Solid-state relay that provides contact output that may be used to indicate supply status when wired a signaling device.
The build a redundant power supply pair, a pair of power supply is needed or Two (2) 1756-PA75R, Two (2) redundant power supply cable such as 1756-CPR2, 1756-CPR2D, and 1756-CPR2U, One (1) Redundant power supply chassis adapter with catalog number 1756-PSCA2, 1756-PSCA2K, or 1756-PSCA2XT and optional signaling device such as an annunciator for monitoring the state of operation of the power supply modules.
The 1756-PA75R operates when supplied by an input Voltage range of 85-265VAC, 47-63 Hz with nominal values of 120VAC / 240VAC and 50/60 Hz. It has an input power requirement of 120VA / 115 W and delivers an output power rating of 75 W when operated at 0…+60 °C (+32…+140 °F) and current capacities of 1.2 A at 1.2 VDC; 4A at 3.3VDC; 13 A at 5.1VDC and 2.8 A at 24VDC. When installing annunciator device, recommended annunciator is 240VAC 50/60 Hz, 240V DC, 50 mA, resistive only.
The dimensions of the 1756-PA75R are approximately 6.9 x 5.7 x 5.4 inches. The weight of this power supply is around 3.2 lb and the annunciator and conductor wire category of this power supply are Category 3 and Category 1 respectively. The annunciator wire size of the 1756-PA75R is 22-14 AWG stranded at 167 °F and made of copper. The conductor wire size of this power supply is 14 AWG. The Allen-Bradley 1756-PA75R has a surge-transient immunity that is based on the IEC 61000-4-5. The surge transient immunity of this power supply is ± 1 kV line-line (DM) and it is ± 2 kV line-earth (CM) on the signal ports. The Conducted RF immunity of the 1756-PA75R is 10 Vrms with a 1 kHz sine-wave of 80% AM from 150 kHz to 80 MHz. The 1756-PA75R is considered to be a Class 1, Class A Appliance in accordance with IEC / CISPR Publications 11. Keep in mind that under proper precautions there may be potential difficulties in ensuring electromagnetic compatibility in other environments due to disruption and radiation.
