DEIF DLQW72-PC-PY

  • Product Name:​ DEIF DLQW72-PC-PY — Generator Protection & Control Relay, 72 mm square panel cutout
  • Product Introduction:​ Microprocessor-based generator protection and monitoring relay designed for gensets up to medium rating. Provides over/under voltage, over/under frequency, overcurrent, reverse power, and start/fail monitoring. The “-PC-PY” suffix denotes specific I/O configuration and communication options (often Modbus RTU and configurable digital I/O).
Category:
Description
  • Technical Specifications:
    • Display: Alphanumeric / graphical LCD (backlit)
    • Voltage inputs: 3-phase LT (line-to-line) or LN, 100 … 500 V AC (PT ratio programmable)
    • Current inputs: 1 A or 5 A CT secondary (ratio programmable)
    • Frequency range: 50 / 60 Hz selectable
    • Protection functions: 51 (OC), 27 / 59 (UV / OV), 81U / 81O (UF / OF), 32 (reverse power), 46 (negative sequence), CB fail monitor
    • Digital I/O: typically 6–8 programmable DI, 4–6 programmable DO (form C or form A relays)
    • Communications: RS-485 Modbus RTU (standard on -PC variants)
    • Supply voltage: 24 V DC (18 … 32 V DC) or 110/230 V AC per variant
    • Accuracy: voltage ±0.5 % FS, current ±0.5 % FS, frequency ±0.01 Hz
    • Operating temperature: –20 … +70 °C
    • Cutout: 72 × 72 mm (DIN 43700), depth ~95 mm behind panel
  • Features:​ Password-protected parameter setting via front keypad or PC (DEIF GAP or M-Logic tool), event log (last 100+ events with time stamp), self-test diagnostics, configurable alarm & trip delays.
  • Application:​ Standby / prime diesel generator sets in commercial buildings, marine auxiliary gensets, cogeneration plants.
  • Installation & Notes:​ CT secondary must never be left open-circuited during operation. Use screened twisted pair for CT/VT wiring. Earth the relay chassis properly. Verify CT polarity before energizing.
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