ABB PMA323BE
ABB PMA323BE - Image 2

ABB PMA323BE

Product Brief (PMA323 Power Monitor):

The PMA323 is a DIN-rail or panel-mount power monitoring device that connects to CTs (1 A/5 A) and VTs (100/√3 V, 110 V, 230 V, 400 V) of a low-voltage (≤690 V) or medium-voltage (via VTs) distribution feeder. It computes:

  • True RMS V, I, P, Q, S, PF, frequency
  • Energy (import/export kWh, kVARh)
  • Harmonics up to 31st order (THD-V, THD-I)
  • Max demand, min/max logging

    It communicates via RS-485 Modbus RTU (standard) or optional Profibus DP / Ethernet to a DCS, BMS, or energy management system (ABB cpmPlus / 800xA Energy Manager).

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Category: SKU: ABB PMA323BE

Description

ABB PMA323BE

  • Technical Specifications (typical):
    • Voltage Inputs: 3 × phase-neutral or phase-phase; range 57–690 V L-L cat (via PT); PT prim/sec programmable
    • Current Inputs: 3 × CT secondary (1 A or 5 A selectable); CT ratio programmable (5–6000 A prim)
    • Accuracy: ±0.5 % of reading (V, I, P); ±1 % energy class 0.5S (IEC 62053-22)
    • Power Supply: 100–240 V AC or 24 V DC (model dep.)
    • Communication: RS-485 Modbus RTU (default); optional Profibus DP-V0/V1, Ethernet (Modbus TCP / IEC 60870-5-104)
    • Digital I/O: Optional alarm relays (2 × SPDT) — over/under voltage, overcurrent, PF alarm
    • Display: Some versions have local LCD; others are headless (data via comms only)
    • Mounting: DIN rail 35 mm or panel
    • Dimensions: ≈90 × 72 × 65 mm (W×H×D) typical for DIN version
    • Operating Temp.: –20 °C to +60 °C
    • Certifications: CE, UL, IEC 61000-6-2/4 EMC, IEC 61010-1
  • Functional Features:
    • Cost-effective energy/sub-metering per IEC 61557 / 62053
    • Harmonic analysis for power quality diagnosis
    • Configurable alarm thresholds & relay outputs
    • Time-stamped min/max/logging (interval logging to internal memory or polled by SCADA)
    • Integrates with ABB 800xA Energy Manager, cpmPlus, or 3rd-party BMS via Modbus
  • Application Scenarios:
    • Main incomer / sub-feeder energy metering in MCC / PCC (MNS / ArTu switchboards)
    • Power quality monitoring at PCC — harmonic distortion check per IEEE 519
    • Retrofit of legacy analog ammeters/voltmeters with digital energy data to plant EMS
    • Generator output metering & protection alarming
  • Material & Structure / Working Principle / Installation / Precautions:
    • Mount on DIN rail near CT/VT secondary termination;
    • Wire CT secondaries (observe polarity — K→Ia+, K→Ib+, K→Ic+; J→N/common) & VT secondaries (observe polarity & fuse); CT secondaries MUST be closed (shorted) until PMAconnected & verified — NEVER leave CT secondary open — lethal HV!
    • Connect 24 V DC / 100–240 V AC supply; connect RS-485 A/B to plant network (daisy-chain with terminating resistors at ends)
    • In PMA config software (or via Modbus registers): set PT prim/sec, CT prim/sec, system type (3P3W / 3P4W), comm parameters (baud, node addr)
    • Precautions:
      • CT circuits: ALWAYS close CT secondary loop before energizing primary; after de-energizing primary, short CT secondaries before disconnecting PMA — open CT = dangerous HV & CT damage
      • Verify PT fuses present & correctly rated
      • For energy billing: use class 0.5S CT + PMA energy class 0.5S — seal CT/PT terminals per local revenue-metering regs if applicable
      • Do NOT exceed VT input range — applying >690 V L-L to 230 V range input damages device

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