1756-PB50 DC Power Supply

Part Number: 1756-PB50
Module Type:  DC Power Supply
Nominal Input Voltage: 24 Volts DC
Input Voltage Range: 18 to 32 Volts DC
Isolation Voltage: 250 Volts continuous
Maximum Inrush Current: 30 Amperes
Current Capacity:
1.5 A at 1.2 V
2 A at 3.3 V
8 A at 5.1 V at 50 °C (122 °F)
6 A at 5.1 V at 60 °C (140 °F)
2.5 A at 24 V at 50 °C (122 °F)
2.0 A at 24 V at 60 °C (140 °F)
Hold-Up Time:
30 ms at 18–32 V DC, 60 W
40 ms at 18–32 V DC, 50 W
Weight: 1.81 lbs (0.82 kg)

The 1756-PB50 is a 1756 DC Power Supply. A system consists of a single controller and various I/O modules in one chassis.
The 1756-PB50 module has an input voltage range of 18 - 32V DC with 24V DC nominal input voltage. It has a maximum input power of 85W at 50 deg. Celsius (122 deg. Fahrenheit), 70W at 60 deg. Celsius (140 deg. Fahrenheit), and the maximum output power of 60 W at 0 - 50 deg. Celsius (32 - 122 deg. Fahrenheit), and 50 W at 0 - 60 deg. Celsius (32 - 140 deg. Fahrenheit). It has a current capacity of 1.5A at 1.2V DC, 2A at 3.3V DC, 8A (50 deg. Celsius) and 6A (60 deg. Celsius) at 5.1V DC and 2.5A (50 deg. Celsius) and of 2.0A (60 deg. Celsius) at 24V DC. It has dimensions of 5.51 x 3.07 x 5.71 in. and weighs 1.7 lbs. It has 250V (continuous) isolation voltage and maximum inrush current of 30A. It is installed in the left slot of the 1756 chassis with an open enclosure or no enclosure. It is compatible with the 1756-A4, 1756-A7, 1756-A10, 1756-A13 and the 1756-A17 (Series A, B, and C) chassis. For wiring, 2.5 mm sq. (14 AWG) solid or stranded copper wire rated at 90 deg. Celsius (194 deg. Fahrenheit) or greater with maximum insulation of 1.2 mm (3/64 in.) is used.

Frequently asked questions：

What is the function of the 1756-PB50 power supply?
It provides regulated DC power to the backplane and field devices, ensuring reliable operation of installed modules.
What input voltage does the 1756-PB50 require?
The module operates on 24 VDC nominal, with an allowable input range of 18 to 32 VDC.
Where is the 1756-PB50 installed in the chassis?
It is installed on the left side of the 1756 chassis.
Is the 1756-PB50 isolated?
Yes, it provides 250 V continuous isolation, helping protect the system from electrical disturbances.

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