中文品名：ABB NTR002‑A 继电器端子板

Order No: NTR002‑A

The NTR002‑A is a cabinet‑mount relay termination board for ABB Bailey INFI‑90 / Symphony legacy DCS system. It is an external signal conditioning termination unit, equipped with on‑board miniature relays, fuse protection and screw‑type field wiring terminals. It realizes signal isolation, relay‑contact output and over‑current fuse protection between DCS I/O module and field‑site equipment. This is discontinued legacy hardware, mainly used for spare‑parts replacement of old power plant and chemical‑plant control systems. Not hot‑swappable。

‑ Power Supply：24 VDC field power supply；typical power consumption 4.8 W

‑ Mechanical Structure：printed‑circuit board assembly, with on‑board relays, fuses, ribbon‑cable connector and field screw terminals；weight approx 0.35 kg

‑ On‑board Resources：multi‑channel miniature relay units, channel fuses, signal filtering components, ribbon‑cable interface for connecting DCS I/O card

‑ Communication Interface：multi‑pin ribbon‑cable connector for DCS I/O module signal connection; screw terminals for field‑device wiring

‑ Galvanic Isolation：galvanic isolation between DCS logic side and field‑relay contact side, isolation rating 2500 VAC

‑ Core Function：DCS signal termination, relay‑contact output drive, channel fuse over‑current protection, field‑signal filtering

‑ Protection：per‑channel fuse over‑current protection, signal surge‑suppression

‑ Status LED Indicators：relay‑channel status indicator LED

‑ Weight：approx 0.35 kg

‑ Receives control‑signal from INFI‑90 DCS I/O module via ribbon cable, drives on‑board miniature relays to output dry‑contact signals for field equipment interlock, alarm indication and auxiliary switching.

‑ Each signal channel is fitted with independent fuse, prevents field short‑circuit fault from damaging DCS internal I/O module circuit.

‑ Provides screw‑type field‑wiring terminals, convenient for on‑site cable connection and maintenance.

‑ Built‑in signal filtering components, suppresses field electromagnetic interference and improves signal reliability.

‑ Pure termination‑relay hardware without independent control logic; cannot run independently, must cooperate with corresponding INFI‑90 series I/O module. NTR002‑A belongs to legacy DCS hardware, only compatible with INFI‑90 / Symphony‑Harmony system.

‑ No on‑board self‑diagnosis CPU; channel working status is judged by LED indication and DCS system feedback.

‑ No local historical‑data storage; fault information is read through DCS controller or commissioning tool.

‑ Blown fuse or relay‑contact damage will cause corresponding field‑output channel failure; DCS controller internal logic still runs normally.

‑ Ribbon‑cable connector: connect to INFI‑90 I/O module.

‑ Screw‑type terminal block: connect to field‑site cables of interlock, alarm and auxiliary equipment.

‑ Mounting：cabinet‑internal fixed‑board installation

‑ Operating Temperature：‑20 ℃ ~ +60 ℃

‑ Storage Temperature：‑40 ℃ ~ +85 ℃

‑ Relative Humidity：5‑95 %RH, non‑condensing

‑ Protection Class：IP20, for cabinet‑inside installation.

‑ Cut off related power supply before installation or replacement. Must adopt specified‑specification fuses; do not use over‑rated fuses.

‑ For spare‑part replacement: verify full model NTR002‑A; after installation check ribbon‑cable connection, verify relay pull‑in action and field‑contact output function. Incorrect wiring will lead to channel‑output anomaly.

‑ Board or channel fault results in failure of corresponding field‑relay‑output signal loop.

Thermal‑power plant, chemical‑plant legacy control system; ABB Bailey INFI‑90 / Symphony‑Harmony DCS; industrial spare‑part for DCS relay‑output signal termination unit.