Rockwell 1797-PS2E2 IS Module Type Power Supply

Description

Mount the 1797-PS2E2 Power Supply
Follow these directions to properly install the 1797-PS2E2 power supply. Refer to the Installation and Commissioning section, page 7, for important precautions and considerations.

Rockwell 1797-PS2E2 IS Module Type Power Supply

1. Overview of 1797-PS2E2 Power Supply:

• The 1797-PS2E2 is a 24V dc in/quad-Ex dc out power supply enclosed in a flame-proof enclosure with increased safety input and output terminations.
• Specifics:
  • 24V dc gland (M20 x 1.5) for cables of 6-12 mm diameter.
  • Ex outputs (M16 x 1.5) for cables of 4-8 mm diameter.
  • Features include 24V dc supply source, four channels with 8.5 W output each, dual power feeds for source input redundancy, and galvanic isolation of outputs from the source.

2. Understanding System Planning:

• System planning involves determining module requirements, power supply needs, system partitioning, and cabinet placement.
• Example: Using a fiber hub requiring 8.5 W, 11 IS-power outputs are needed, and three power supplies are sufficient, each providing four independent IS-power outputs at 8.5 W.

3. Role of Power Supply in Intrinsically Safe Systems:

• The power supply is a crucial component in an intrinsically safe system.
• It isolates unsafe incoming power, limiting energy to IS-safe levels.
• FLEX Ex modules in hazardous areas derive power for valves, actuators, or transmitters from the power supply.

4. Installation and Commissioning:

• Location and Zones:
  • The power supply can be located in Zones 1, 2, and 22 as labeled.
  • Output circuits are Ex ib, suitable for installation in Zones 1, 2, and 22.
• Installation Guidelines:
  • Follow EC-type examination certificate and national regulations.
  • Housing (Ex d) must not be opened; connections in (Ex e) terminal box.
  • Power feed lines installed in the deenergized state.
• Safety Measures:
  • Intrinsically-safe output terminals can be connected and disconnected during operation.
  • Unused cable glands covered with Ex e lead seals (IP54).
  • Inspection and replacement of damaged seals before closing (Ex e) wiring box.
• Earthing and Fixing:
  • (Ex d) housing includes earthing screw (connected to Earth with a minimum 4 mm² area).
  • Two flanges for secure fixing to a wall or structural part.
• Maintenance and Cleaning:
  • (Ex e) terminal box can be opened for maintenance, ensuring dust-free conditions.

By organizing the information in this manner, the article provides a structured understanding of the 1797-PS2E2 power supply, its role in system planning, installation guidelines, and crucial safety measures for intrinsically safe systems.

Rockwell 1797-PS2E2 IS Module Type Power Supply