ABB PHARPSCH100000 MPS III Power Chassis Unit

Module Feature

PHARPSCH100000 is the chassis unit of ABB MPS III modular power system, also marked P-HA-RPS-CH100000.

It provides mechanical slot, backplane power bus and cooling structure for matching PHARPS series power modules, supports N+1 redundant configuration and hot module replacement without system shutdown. Backplane distributes multiple DC output rails for DCS controller, I/O card and communication modules. Built-in cooling fan group and fan failure detection circuit. Metal rack structure, conformal coated backplane, good EMC performance for continuous operation in power station and petrochemical DCS room. Widely stocked as maintenance spare for ABB Symphony and INFI90 control cabinet.

Working principle

AC/DC input power is fed to the backplane bus of chassis.

Power modules inserted into slots convert input into stable low-voltage DC power. The backplane realizes parallel current sharing and fault isolation between redundant modules. Fan assembly dissipates heat for all power units. If one power module fails, the remaining modules take full load automatically; fan fault signal will be sent to DCS for alarm.

Onboard components

Metal rack housing, multi-slot backplane bus board, cooling fan bank, fan monitoring circuit, input terminal block, DC distribution bus bar, status LED array and guide rail locking mechanism.

LED indicators

LED indicators for Power, Fan Fault, Module Healthy status.

Hardware self‑diagnosis

Monitors fan speed, backplane bus voltage and module presence. System alarm information can be viewed via Symphony DCS operation software.Programming softwareSymphony Engineering Tool, used for power system alarm configuration and status monitoring.

Electrical & Process Parameters

Model:PHARPSCH100000 Brand:ABB (Bailey) Device type:MPS III DCS redundant power chassis Function:Mechanical support, power distribution and heat dissipation for hot-swappable DCS power modules

Mechanical & Structure

Mounting:19-inch standard rack installation Protection class:IP20 cabinet installation Housing:Steel metal rack chassis

Environmental

Operating temperature:-20℃ ~ +50℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:CE, IEC61010 Status:Original ABB DCS power chassis spare

Installation

Isolate main AC power before chassis replacement.

Fix rack to cabinet, connect main input cable, insert matched power modules, verify fan rotation and bus voltage, test redundant switchover and fan fault alarm function after commissioning.

Interface

AC/DC main input terminals, backplane module slots, fan fault DO alarm terminals, DC distribution bus.

Diagnostic

Fan fault alarm: Fan aging, dust blockage, fan monitoring circuit damage. Module not detected: Backplane connector oxidation, module loose seated. Redundancy switch fail: Bus bar contact poor, module parameter mismatch.

Product BriefPHARPSCH100000 chassis, ABB MPS III redundant power chassis spare for Symphony INFI90 DCS cabinet replacement.