The Allen-Bradley 1768-PA3 is a dedicated power supply for the CompactLogix 1768 product family. Its primary role is to supply backplane power to energize all connected modules within the system. This module accepts a wide range of input voltages, including 85 to 265VAC or 108 to 132VDC. Therefore, it offers excellent flexibility for different regional power standards. Additionally, this power supply features a typical efficiency of 75% and a maximum input power of 120 VA or 120 W. It includes an internal non-replaceable fuse for overcurrent protection. Meanwhile, an LED indicator provides clear visual status of the unit's operating condition.
The 1768-PA3 supports dual-input voltage categories for global compatibility. Specifically, it operates on 85 to 265V AC at 47 to 63 Hz. Alternatively, it accepts 108 to 132V DC input. This flexibility makes it suitable for various industrial environments. The module delivers 1.4 Amps at 24 Volts to the backplane. Consequently, it powers the controller and other I/O modules effectively. Maximum power consumption reaches 33.6 Watts. Meanwhile, power dissipation is rated at 7.5 Watts typically, with a maximum of 30 Watts. The unit also features a typical efficiency rate of 75%, ensuring energy-efficient operation.
Understanding the inrush current is important for system design. For AC input at 85 to 132V, the nominal inrush current is 25 A, with a maximum of 50 A. At 195 to 265V AC, the nominal inrush reaches 50 A, peaking at 80 A maximum. For DC input at 108 to 132V, the nominal inrush is 25 A. Moreover, the 1768-PA3 includes internal overcurrent protection via a non-replaceable soldered fuse. Rockwell Automation also recommends external overcurrent protection rated at 4 to 6 A with 28.5 to 36.7 A² S characteristics. This dual-layer protection enhances system safety and reliability.
The 1768-PA3 power supply is exclusively designed for the 1768 CompactLogix product family. It works seamlessly with controllers such as the 1768-L43, 1768-L43S, 1768-L45, and 1768-L45S. When building your system, you must consider the power supply distance rating for each module. This rating ensures every module receives adequate backplane power from the 1768-PA3. Furthermore, if you use 1769 Compact I/O modules, this power supply can accommodate up to eight modules in the same bank. This capacity makes it a practical choice for medium-sized control systems.
Physically, the 1768-PA3 features an open-style enclosure. It does not have a protective housing, so you must install it inside a control cabinet. The module supports two mounting options. First, you can snap it onto a standard DIN rail. Second, you can attach it directly to a panel using screws. For wiring, use 14 to 22 AWG stranded or solid copper wire. This wire must be rated at 167°F with a minimum isolation of 1.2 mm. The module's shipping dimensions are 8 x 8 x 5 inches, and it weighs approximately 2 lbs. Isolation voltage is rated at 30 Volts continuous for added safety.
The 1768-PA3 includes a single LED indicator for real-time status monitoring. Under normal operation, this LED displays a steady green color when power is applied. If the LED remains off, you should first verify the input power source. Additionally, check for possible shorts or overloads within the 1768 system. If the LED turns red, it indicates a problem with the backplane power output. This condition may require controller replacement. Alternatively, a faulty communication or motion module could cause this issue. Always follow proper diagnostic procedures to identify the root cause.
First, ensure the system is completely powered down before installation. Next, choose your preferred mounting method. For DIN rail mounting, snap the 1768-PA3 securely onto the rail until the latch clicks. For panel mounting, use appropriate screws and brackets. After mounting, connect the input power wires to the designated terminals. Observe correct polarity for DC input connections. Then, insert the module into the 1768 backplane. Ensure the backplane connector engages firmly. Finally, apply power and verify the LED turns green. Remember, never install a 1769 power supply onto a 1768 CompactLogix backplane. This mismatch can cause serious damage.
1 x 1768-PA3 Power Supply Module
1 x Installation Instructions Manual
1 x Terminal block connector (pre-attached)
Mounting hardware for DIN rail (pre-installed)
Note: Input power cables and external circuit protection devices are sold separately.
All orders are shipped via FedEx, UPS, or DHL. These reliable carriers ensure fast and secure delivery. The module is carefully packaged in anti-static materials and cushioned for protection. Tracking numbers are provided once your order ships. Please allow 1-2 business days for order processing.
1. What input voltages does the 1768-PA3 support?
The 1768-PA3 accepts 85 to 265V AC at 47-63 Hz. It also accepts 108 to 132V DC. This dual-input design offers installation flexibility.
2. Can I use this power supply with 1769 Compact I/O modules?
Yes, the 1768-PA3 can support up to eight 1769 Compact I/O modules in the same bank. However, always check the distance rating for each module.
3. What does the red LED on the 1768-PA3 indicate?
A red LED indicates the backplane power output is not valid. This could mean the controller needs replacement. Alternatively, a faulty module might be causing the issue.
4. Does the 1768-PA3 supply output power to field devices?
No, this power supply provides backplane power only. It energizes the internal circuitry of connected modules. It does not supply output power to external field devices.
5. What overcurrent protection does the 1768-PA3 have?
It has an internal non-replaceable soldered fuse. Rockwell also recommends an external overcurrent protection device rated at 4 to 6 A with specific trip characteristics.
| Brand Name | |
| Model No. | 1768-PA3 |
| Product Type | Power Supply Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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