Yokogawa PS35*A CENTUM Series Power Supply Module

The Yokogawa PS35*A, also cataloged as the Yokogawa PS35-A Power Supply Module, operates as a dedicated hardware component for delivering regulated DC power to I/O cards and nests within CENTUM VP, CENTUM XL, and u-XL network architectures.

Hardware Specifications

Process Control & DCS Instrumentation Properties

The Yokogawa PS35*A incorporates robust galvanic isolation barriers to decouple the AC incoming utility grid from the low-voltage DC logic backplane. The internal circuit architecture generates a steady 24 VDC output regulating up to 3.5 A, utilizing built-in over-voltage, over-current, and short-circuit trip thresholds to isolate downstream I/O hardware cards during localized component failures. Integrated front-panel LED indicators output continuous diagnostic signals, changing state immediately if an internal rail drop or overload fault disrupts the 85 W power allocation limit.

Frequently Asked Questions

Q: What are the consequences of overloading the 3.5 A output current envelope?

A: Exceeding the 3.5 A capacity activates the internal over-current protection circuit, forcing the module to limit output voltage or shut down the 24 VDC rail completely. The front-panel Power ON LED will extinguish or toggle to a Fault indication state until the overload condition is physically cleared.

Q: Is manual voltage configuration required to switch between 100-120 VAC and 200-240 VAC input links?

A: Input voltage parameters match standard industrial power schedules. Depending on the specific terminal configuration of the host RYH-32 or RYV-11 nest assembly, the input wiring must be terminated at the designated low or high AC voltage terminals to ensure correct input transformation.

Q: Can this power module be hot-swapped within legacy nest configurations during live process operations?

A: No, unassisted hot-swapping is prohibited. Because this module serves as the primary 85 W supply rail for adjacent I/O cards inside the nest, removing the unit while energized cuts off power to all shared channels, dropping current loops and causing a total loop signal disruption.

Field Installation Guidelines

• Nest Assembly Alignment: Slide the power supply module straight into the designated power slot of the horizontal RYH-32 or vertical RYV-11 nest structure. Verify that the rear bus bar pins engage fully before locking the physical chassis retaining hardware down.
• AC Supply Wire Routing: Route the high-voltage 100-120 VAC / 200-240 VAC supply line conductors through an independent conduit path. Keep these AC cables completely separate from any low-voltage 4-20 mA or discrete signal cables to block electromagnetic noise induction.
• Chassis Safety Grounding: Connect a dedicated low-impedance copper ground strap from the enclosure frame ground lug directly to the central plant instrumentation earth grid. Do not daisy-chain this ground connection with heavy inductive motor lines.
• Thermal Convection Clearance: Maintain unrestricted ventilation gaps above and below the nest assembly frame. Stagnant air zones can cause internal temperatures to exceed the 55 deg C maximum operating threshold, accelerating component degradation and causing premature thermal trips.