The Omron CVM1-PA208 serves as the primary CVM1 Power Supply Unit utilized to execute internal rack bus power conversion and regulation across CV Series PLC system platforms. It converts an AC mains supply input of 100 to 240 VAC into regulated 5 VDC logic power and 24 VDC auxiliary power for CPU processors, memory cards, and local rack modules without introducing power line ripple.

Model Nomenclature Breakdown

• CVM1: CV Series modular system rack architecture.
• PA: Alternating current (AC) power supply module configuration.
• 208: Standard power capacity rating with 5 VDC output up to 8 A.

System Technical Specifications

Backplane Power Distribution & System Compatibility

The CVM1-PA208 delivers stabilized logic voltage directly across the CPU backplane bus to ensure predictable communication velocity and timing across installed expansion racks. Stable voltage rails prevent logic bus errors during high I/O density scaling when multiple digital and analog modules execute high-frequency scan tasks. Built-in hold-up power circuits sustain backplane operation through momentary AC line voltage drops without interrupting firmware flash compatibility routines.

Supply Package & Components

• 1 x Omron CVM1-PA208 Power Supply Unit
• 1 x Protective Terminal Block Cover
• 1 x Technical Instruction Leaflet

Cabinet Installation & Field Wiring

Rack Assembly Method

• Insert the CVM1-PA208 into the dedicated leftmost slot on the CVM1 backplane rack chassis.
• Tighten top and bottom module locking screws to 0.8 N m to prevent ground contact resistance from rising due to physical vibration.

Mains Power Wiring

• Wire the primary AC power leads to the AC(L) and AC(N) screw terminals using stranded copper conductors with M3.5 ring lugs.
• Connect the dedicated GR terminal directly to an independent earth ground point with minimum 2.0 mm2 conductor wire to suppress high-frequency line noise.

Frequently Asked Questions

• Can the CVM1-PA208 power supply unit be hot-swapped while the rack is energized?

  No, the CVM1-PA208 does not support hot-swap insertion or removal. Primary AC input power must be isolated prior to physical installation or module extraction.

• What input voltage limits apply to the AC supply terminals?

  The module accepts a nominal rating of 100 to 240 VAC at 50/60 Hz, with a continuous operational tolerance range of 85 to 264 VAC.

• What logic voltage and current capacity does this module supply to the rack?

  The unit provides a regulated 5 VDC output rail at a maximum load current of 8 A directly to the internal backplane bus.

• How does the power supply handle transient line noise on the incoming AC line?

  Integrated noise suppression filters direct line transients through the internal shield circuits to the GR terminal, requiring a low-impedance earth ground connection.

• What protection mechanism activates during a 5 VDC output overload condition?

  An overcurrent detection circuit limits output current and drops output voltage when total load demand exceeds 8 A, restoring output automatically once the fault clears.

• What torque value must be applied to the field wiring terminal screws?

  Tighten the M3.5 terminal screws to a torque range of 0.8 to 1.2 N m to maintain gas-tight electrical contact.

• Does the CVM1-PA208 include a terminal for monitoring operational status?

  Yes, a dedicated RUN output relay contact closes when 5 VDC output voltage remains within normal operational threshold limits.

• What is the dielectric voltage rating between the field terminals and casing?

  The module maintains dielectric isolation up to 2300 VAC applied for 1 minute between the AC power terminals and the metallic ground frame.