Yaskawa CPS-18F8 Power Supply Unit (PSU)
The YASKAWA CPS-18F8 (often part of the CPS-18F series) is a robust Power Supply Unit (PSU) specifically designed for YASNAC CNC systems and early Motoman robot controllers.
It is a mission-critical component that converts AC input into the stabilized DC voltages required to power the controller’s logic boards, CPU, and interface cards.
Introduction
The CPS-18F8 is a backplane-mounted power supply.
It is widely recognized for its high stability and is a staple in legacy industrial machine tools (like Matsuura or Mori Seiki) that utilize YASNAC control systems.
It typically features multiple DC outputs to support different electronic logic levels within the same rack.
Technical Parameter Table
| Parameter | Specification |
| Manufacturer | Yaskawa Electric Corporation |
| Model Number | CPS-18F8 (Series: CPS-18F) |
| Input Voltage | 200V – 230V AC (Single Phase) |
| Input Frequency | 50/60 Hz |
| Output 1 (Logic) | +5V DC @ 15A |
| Output 2 (I/O/Relay) | +24V DC @ 4.5A |
| Cooling Method | Natural convection or internal fan (depending on housing) |
| Connection Type | Multi-pin blade connectors / Screw terminals |
| Weight | Approx. 2.0 kg |
| Mounting | Standard Yaskawa Rack / Backplane mount |
Product Advantages and Features
Multi-Rail Output: Provides both +5V for digital logic and +24V for peripheral I/O, eliminating the need for separate power modules.
Industrial Durability: Engineered for 24/7 operation in harsh factory environments with high resistance to heat and electrical noise.
Overload Protection: Built-in circuitry to prevent damage to expensive CPU and memory boards in the event of a short circuit.
Maintenance Friendly: Features standard connectors that allow for rapid “hot-swap” replacement, significantly reducing machine downtime.
Application Cases
YASNAC J50/MX3 CNCs: Acting as the primary power source for the main processing unit and operator panel.
Vertical Machining Centers: Powering the control electronics in machines from brands like Matsuura and Kitamura.
Legacy Motoman Robots: Used in the power distribution racks of ERC and MRC series robot controllers.
Retrofit Projects: Frequently used by engineers to maintain or restore older CNC equipment where original parts are discontinued.
Other Models in the Same Series
The CPS series includes various power ratings and output configurations tailored for different controller sizes:
CPS-18F8
| Model | Application/Notes |
| CPS-18FB | Similar to 18F8, common in newer YASNAC revisions. |
| CPS-150F | Higher power capacity for larger control racks. |
| CPS-420F | Specialized for the Motoman NX100 controller series. |
| CPS-520F | High-output unit for DX series robot controllers. |
| CPS-10F | Compact version for smaller, single-axis control units. |