1797-PS2E2 | Allen-Bradley FLEX Ex Power Supply

The Allen-Bradley 1797-PS2E2 is a robust, 24V DC power supply designed for hazardous environments and certified for use in potentially explosive atmospheres. The power supply comes in a flame-proof enclosure with increased safety-rated input and output terminations, ensuring protection in high-risk applications. It is well-suited for the FLEX Ex I/O system, offering high reliability and redundancy with dual power feeds.

Key Features

Input Power: 24V DC with a voltage range of 18–32V
Output Power: Four independent channels, each providing 8.5W, totaling 34W
Redundancy: Dual power feeds for input redundancy, enhancing reliability
Galvanic Isolation: Outputs are IS (intrinsically safe) and galvanically isolated from the input
Ingress Protection: IP65/NEMA 7B, suitable for demanding environments
Cable Entry Glands:
- 24V DC Input Gland: M20 x 1.5, supports cable diameters of 6–12 mm (0.267–0.472 in.)
- Ex Outputs: M16 x 1.5, supports cable diameters of 4–8 mm (0.157–0.315 in.)

Technical Specifications

Attribute	Value
Input Voltage Range	18–32V DC
Input Current Consumption	3.1–1.6 A
Ripple	5% AC
Output Power	4 channels, 8.5W each (total output power: 34W)
Inset Voltage Range	18–32V DC
Output Voltage (Uo)	<9.5V
Output Current (Io)	<1 A
Capacitance (Co, IIC)	<500 nF
Inductance (Lo, IIC)	<8 µH
Max Cable Resistance	<0.1 Ω
Thermal Dissipation	71.67 BTU/hr
Input Power Rating	55W
Power Dissipation	21W
Conductor Size	Up to 4 mm² (12 AWG), insulation rated 100 °C (212 °F) or higher
Dimensions (HxWxD)	140 mm x 174 mm x 280 mm (5.51 in x 6.9 in x 11.0 in)
Weight	7.7 kg (17 lbs)
Protection Rating	IP65/NEMA 7B

Environmental and Operational Ratings

Operating Temperature: -20°C to 70°C (-4°F to 158°F)
Storage Temperature: -40°C to 85°C (-40°F to 185°F)
Relative Humidity: 5–95% non-condensing
Shock:
- Operating: 15 g (IEC 60068-2-27, Test Ea)
- Nonoperating: 15 g (IEC 60068-2-27, Test Ea)
Vibration: 2 g at 10–500 Hz (IEC 60068-2-6, Test Fc)

Certifications

The 1797-PS2E2 has received multiple certifications for compliance with international standards, particularly for use in hazardous areas:

C-Tick: Compliance with Australian Radiocommunications Act, AS/NZS CISPR11, Industrial Emissions
INMETRO Certification: BR-Ex de [ib] IIC T4, Certificate No. 05/UL-BRAE-0018X
IECEx Certification: Ex de[ib] IIC T4 Gb, Certificate No. IECEx BVS 09.0019X

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