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Emerson PSM-D21 Genuine Telecom Hardware Shot 2
EmersonModel: PSM-D21

Emerson PSM-D21 DC Utility Power Monitoring & Battery String Inspection Unit (LCD/Hot-Plug)

The Emerson PSM-D21 is a mission-critical utility-grade DC power supervisory and battery string inspection controller engineered for 220V, 110V, and -48V DC power systems in electrical substations and power plants. It integrates full rectifier control, bus insulation monitoring coordination, digital I/O alarm acquisition, and automated battery management within a hot-swappable module featuring an LCD graphical interface.

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System Nominal Voltage
220V / 110V / -48V DC
Communication Interfaces
RS485, RS232
Supported Protocols
Modbus-RTU, CDT, DLT645
Operating Temperature Range
-40°C ~ +75°C
Hot-Swappable Support
Yes (Live Hot-Pluggable / Plug-and-Play without Power Interruption)
Display Type
Display Interface

What this product is

What this product is

Built into a hardened metal sub-rack cassette, the PSM-D21 incorporates a 32-bit industrial microprocessor, conformal-coated multi-layer PCBs, and optical isolation across all external measurement and communication channels. It interfaces seamlessly with Emerson utility rectifiers, DC distribution sub-racks, and third-party RTUs using native Modbus-RTU, CDT, and DL/T645 protocols compliant with IEC 61000-4 and IEEE substation automation standards.

What problem it solves

It eliminates the risk of silent DC bus collapse caused by undetected battery cell deterioration, ground fault insulation breakdown, and unmanaged thermal runaway during recharging cycles. Furthermore, its live hot-pluggable architecture resolves the operational requirement of taking entire DC tripping circuits offline during supervisory maintenance, ensuring continuous breaker trip-coil readiness.

Who and where it is for

Engineered for 110kV through 500kV electrical transmission and distribution substations, UHV converter stations, thermal, hydro, and nuclear power generation plants, metro traction power substations, and heavy industrial plant DC distribution switchboards.

Core advantages

  • High-strength plug-in metallic chassis supporting live hot-swappable maintenance for the PSM-D21 module, eliminating DC system downtime risks.
  • Embedded high-performance 32-bit industrial processor with conformal-coated isolation circuits for precise battery inspection and insulation monitoring.
  • Comprehensive protocol stack supporting DL/T645, CDT, and Modbus-RTU via RS485/RS232 for seamless substation automation integration.
  • Versatile 220V/110V/-48V DC nominal voltage compatibility featuring smart boost-float charging conversion and proactive thermal runaway early warning.

Technical specifications

Key specificationsValue
Display TypeDisplay Interface
System Nominal Voltage220V / 110V / -48V DC
Communication InterfacesRS485, RS232
Supported ProtocolsModbus-RTU, CDT, DLT645
Operating Temperature Range-40°C ~ +75°C
Hot-Swappable SupportYes (Live Hot-Pluggable / Plug-and-Play without Power Interruption)
Non-Volatile Log Capacity10,000+ Cyclic Event Records
Unit Power Consumption< 8W (Ultra-Low Standby Design)
Industrial EMC LevelEN 55032 Class A / IEC 61000-4 Level 4
Relative Humidity Tolerance5% to 95% RH (Non-Condensing)

Applications

01

Transmission and distribution substations (110kV/220kV/500kV) for protection and trip-coil DC bus supervisory control

02

Power plant turbine governor and emergency lube oil auxiliary DC system management

03

Railway transit traction substation signaling, control, and telecommunication DC power monitoring

04

Petrochemical and heavy metallurgy switchgear DC control power and battery string surveillance

Frequently asked questions

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