ControlLogix Power Supplies

Allen Bradley offers ControlLogix power supplies for the ControlLogix control systems with 1756 chassis. Collectively these power supplies are identified as ‘1756 ControlLogix power supplies.’ There are five types of power supplies, including ControlLogix standard AC, ControlLogix standard DC, ControlLogix-XT, ControlLogix redundant, and ControlLogix-XT redundant. These power supplies can provide DC power directly to the chassis backplane in the range of 1.2V, 3.3V, 5V, and 24V. This guide provides in-depth technical knowledge for the selection of ControlLogix power supplies. 

1. 1756 ControlLogix Standard AC Power Supplies 

There are six models of standard AC power supplies. Comparing the size, some of the models are wider than others. The slim variants of standard AC power supplies are low-capacity models, which include PA50 and PA50K. The large-size models are higher in capacity and include PA72/C, PA72K/C, PA75/B, and PA75K/B.

1.1 Technical Specifications 

Input Voltage and Frequency: The input voltage for the standard AC power supplies ranges from 85 to 265V AC, and the nominal input voltage is 120V/240V AC. The input frequency of AC power supplies can vary between 47 Hz and 63 Hz. 

Input Power: The maximum input power for the PA50 models is 81W/91VA @ 50°C and 68W/77VA @ 60°C, whereas for PA72 and PA75 models, the maximum input power is 100VA/100W.  

Output Power: PA50 models can deliver maximum output power from 50W to 60W based on temperature variation. In contrast, the models PA72 and PA75 can output a power of 75W.  

Inrush Current: The inrush current value for all models of standard AC power supplies is 20A. 

Hold Up Time: The holdup time is an important performance measure of the control system power supplies. It is the time in cycles for which the power supply holds the DC output when the input voltage is removed. This time varies from one model to another. The holdup time for PA50 models is up to 5 cycles against 85-265V AC. The holdup time for PA72 models of power supplies is up to 6 cycles at 240V AC. For the PA75 models, the maximum holdup time for a power supply is 20 cycles at 220V AC.  

Current Capacity:The current capacity of standard AC power supplies varies at different values of DC voltages.  

• The current capacity at 1.2V DC is 1.5A which is the same for all standard AC power supply models. 
• The current capacity of power supplies at 3.3V DC is 2A for PA50 models and 4A for PA72 and PA75 models.  
• The current capacity of power supplies at 5.1V DC is 8A for PA50 models, 10A for PA72 models, and 13A for PA75 models.  
• The current capacity of power supplies at 24V DC is 2.5A for PA50 models and 2.8A for PA72 and PA75 models. 

Other Attributes

• The approximate weight of standard AC power supplies varies from one model to another. The PA50 models weigh around 0.77kg, and the PA72 and PA75 models weigh approximately 0.95kg. 
• The standard AC power supplies are compatible with the series B and C chassis. The PA50 models are additionally compatible with the series A chassis.  
• The supported chassis models include 1756-A4, A7, A10, A13, and A17. 
• The power supply modules are positioned on the left side of the 1756 chassis. 
• The physical dimensions of the PA50 models are H14 × W7.8 × D14.5 cm, and the models PA72 and PA75 have dimensions of H14 × W11.2 × D14.5 cm. 
• A copper wire of 2.5mm² in solid or stranded format is recommended. 

2. 1756 ControlLogix Standard DC Power Supplies

There are eight variants of standard DC power supplies. The low-capacity models of standard DC power supplies include PB50 and PB50K. The higher capacity standard DC power supply models include PB72/C, PB72K/C, PB75/B, PB75K/B, PC75/B, and PH75/B.  

2.1 Technical Specifications

Input Voltage: The input voltage for standard DC power supplies is different for different models. The PB50, PB72, and PB75 variants have an input voltage range of 18 to 32V DC with a nominal value of 24V DC. The PC75/B has an input voltage range of 30 to 60V DC with a nominal value of 48V DC, and the PH75/B has an input voltage range of 90 to 143V DC with a nominal value of 125V DC. 

Input Power: The maximum input power for all standard DC power supplies is 95W, except the PB50 models, which have an input power of 85W @ 50°C, and 70W @ 60°C. 

Output Power: The maximum output power for all standard DC power supplies is 75W under 60°C, except the PB50 models, which have an output power of 60W under 50°C, and 50W under 60°C. 

Inrush Current: The inrush current value for all models of standard DC power supplies is 30A. 

Hold Up Time: The holdup time for DC power supplies is measured in milliseconds. This time varies from one model to another. The maximum holdup time for PB50 models is 40ms at 50W output power. The maximum holdup time for PB72 and PB75 models is 40ms at 32V DC. For PC75/B and PH75/B, the holdup time is 50ms.  

Current Capacity: The current capacity of standard DC power supplies varies for different values of DC voltages.  

• The current capacity at 1.2V DC is 1.5A which is the same for all power supply models. 
• The current capacity of power supplies at 3.3V DC is 2A for PB50 models and 4A for all other models.  
• The current capacity of power supplies at 5.1V DC is 8A for PB50 models, 10A for PB72 models, and 13A for PB75, PC75/B, and PH75/B models.  
• The current capacity of power supplies at 24V DC is 2.5A for PB50 models and 2.8A for all other models. 

Other Attributes 

• The weight of the PB50 models is around 0.77 kg, whereas the PB72, PB75, PC75/B, and PH75/B models weigh approximately 0.95kg. 
• The standard DC power supplies are compatible with the series B and C chassis. The PB50 and PB72 models are additionally compatible with the series A chassis.  
• The supported chassis models include 1756-A4, A7, A10, A13, and A17. 
• The power supply modules are positioned on the left side of the 1756 chassis. 
• The physical dimensions of the PA50 models are H14 × W7.8 × D14.5 cm, and the rest of the models have dimensions H14 × W11.2 × D14.5 cm.
• A copper wire of 2.5mm² in solid or stranded format is recommended. 

3. 1756 ControlLogix-XT Power Supplies

The ControlLogix-XT power supplies can operate under extreme temperatures. The operating temperature range for these power supplies is from -25°C to 70°C, unlike the standard power supplies, which can operate in a temperature range of 0°C to 60°C. Four models of ControlLogix-XT power supplies, including two AC and two DC, are available. The ControlLogix-XT power supplies AC models include PAXT and PA30XT, and DC models include PBXT and PB30XT.

3.1 Technical Specifications

Input Voltage: The input voltage range for PAXT and PA30XT power supplies can range from 85 to 265V AC with nominal values of 120/240V AC. The input frequency for these AC power supplies ranges from 47 Hz to 63 Hz. Similarly, the input voltage range for PBXT and PB30XT power supplies can range from 18 to 32V DC with a nominal value of 24V DC.  

Input Power: The maximum input power for all models is different from each other. The value for input power is 82VA 64W for PAXT, 60VA 50W for PA30XT, 70W for PBXT and 50W for PB30XT. 

Output Power: The maximum output power for PAXT is 42W, for PA30XT is 30W, for PBXT is 52W, and for PB30XT is 30W. These output power values can be achieved when the surrounding temperature is from -25°C to 70°C.  

Inrush Current: The inrush current value for ControlLogix-XT AC power supplies is 20A. In contrast, the inrush current value for DC power supply models is 30A. 

Current Capacity: The current capacity of ControlLogix-XT power supplies varies at different values of DC voltages.  

• At 1.2V, all ControlLogix-XT power supplies have a current capacity of 1.5A. 
• At 3.3V, the PAXT and PBXT can provide 4A and PA30XT, and PB30XT can provide 2A current capacity. 
• At 5.1V, the PAXT and PBXT can provide 8A and 10A, respectively, whereas PA30XT and PB30XT have a 6A current capacity. 
• At 24V, the PAXT and PBXT can provide 1.75A and 2.1A, respectively, whereas PA30XT and PB30XT have a 1.25A current capacity. 

Other Attributes 

• The weight of the PAXT and PBXT models is approximately 0.95 kg, whereas the models PA30XT and PB30XT are around 0.77kg. 
• The supported chassis models from the 1756 series include A4LXT/B, A5XT/B, A7LXT/B, A7XT/B, A7XT/C, and A10XT/C. 
• The power supply modules are positioned on the left side of the 1756 chassis. 
• The physical dimensions of the PAXT and PBXT models are H14 × W11.2 × D14.5 cm, and the models PA30XT and PB30XT have dimensions of H14 × W7.8 × D14.5 cm. 
• A copper wire of 2.5mm² in solid or stranded format is recommended.  

4. 1756 ControlLogix Redundant Power Supplies

The ControlLogix power supplies also include redundant power supplies that offer additional features other than the ones available in the standard power supplies. First, they support redundant operations. Second, they can automatically share the load between redundant power supplies through chassis. Third, they can figure out the operational anomalies with the power supplies. Fourth, they also have status indicators for operation and a built-in system recognition feature when connected to an input module. The redundant power supplies are installed in a pair for single chassis. There are four redundant power supplies, including two AC and two DC models, PA75R, PA75RK, PB75R, and PB75RK.

4.1 Technical Specifications

Input Voltage 

The input voltage range for PA75R and PA75RK is 85 to 265V AC with a nominal input voltage of 120V/240V AC at 50/60Hz, whereas the input voltage range for PB75R and PB75RK is 18 to 32V DC with a nominal input voltage of 24 DC.  

Input Power: The maximum input power for PA75R and PA75RK models is 120VA 115W. The maximum input power for PB75R and PB75RK models is 110W.  

Output Power: All ControlLogix redundant power supply models can output a maximum power of 75W when operating between 0°C to 60°C.  

Inrush Current: The inrush current value for redundant AC power supplies is 20A, whereas the inrush current value for DC power supply models is 30A. 

Hold Up Time: The holdup time for redundant AC power supplies is 2 cycles at 50Hz or 60Hz. In contrast, the holdup time is 20ms for the redundant DC power supplies.  

Current Capacity: The current capacity of ControlLogix redundant AC and DC power supplies is the same at different values of DC voltages. At 1.2V, all ControlLogix redundant power supplies have a current capacity of 1.5A. At 3.3V, the power supplies have a current capacity of 4A. At 5.1V, the current capacity is 13A, and at 24V, it is 2.8A. 

Annunciator Power: The annunciator power is specific to the redundant power supplies. The annunciator power rating for PA75R and PA75RK models is 240V AC at 50/60Hz and 240V DC at 50mA. Similarly, the annunciator power rating for PB75R and PB75RK models is 90V DC.   

Other Attributes 

• The approximate weight of all redundant power supplies is 1.45kg. 
• The supported chassis models from the 1756 series include A4, A7, A10, A13, and A17. 
• The physical dimensions of redundant power supplies are H17.5 × W14.5 × D13.7 cm. 
• The suitable copper wire in solid or stranded format for power delivery is 2.5mm² or greater with maximum insulation of 1.2mm. For the annunciator, the wire size can range from 0.25 to 2.5mm². 

5. 1756 ControlLogix-XT Redundant Power Supplies

The ControlLogix-XT redundant power supplies are redundant power supplies that can operate under extreme temperatures, like ControlLogix-XT power supplies. There are two models of the ControlLogix-XT redundant power supplies. These are similar in most of the attributes to the ControlLogix redundant power supplies. The models include PAXTR, an AC version, and PBXTR, a DC version. The differences and unique features of these power supplies are discussed next.

5.1 Technical Specifications

• The PAXTR has a nominal input voltage of 120/240V AC, and PBXTR has 24V DC. The maximum input power for these models is 75VA 65W, and 81W, respectively.  
• The PAXTR and PBXTR power supplies can output a maximum power of 42W and 52W, respectively. 
• The current capacities of these power supplies at 1.2V, 3.3V, 5.1V and 24V are 1.5A, 4A, 8A, and 1.75A, respectively. 
• The specifications like annunciator power, power supply dimensions, weight, recommended wire size, and compatible chassis models are similar to the ControlLogix redundant power supplies.  

6. Environmental Specifications of ControlLogix Power Supplies

There are various environmental specifications that define the performance of different models of ControlLogix power supplies. Multiple factors and the recommended ranges of different parameters are generally the same for all models.

Temperature: The non-operating or storage temperature for all ControlLogix power supplies ranges from -40°C to 85°C. The operating temperature for standard AC, standard DC, and redundant power supplies is 0°C to 60°C. In contrast, the operating temperature for ControlLogix-XT and ControlLogix-XT redundant power supplies ranges from -25°C to 70°C.  

Vibration: All ControlLogix power supplies can bear a vibration of 2g at a frequency between 10 to 500 Hz.  

Shock: The shock value for non-operating or stored power supplies is up to 50g, and the shock value is limited to 30g when the power supply is in the operating state. 

Immunity: The power supplies have various built-in immunities and protection mechanisms, including ESD, radiated RF, EFT/B, surge transient, conducted RF, and voltage variation. The standard AC power supplies and AC models of ControlLogix-XT power supplies additionally support damped oscillatory wave immunity.