This document is the safety instructions for NTR 774 B 03 - 2006 4/4 produced by ArcelorMittal, including instructions for explosion hazards, involuntary operation of equipment, product disassembly and repair, and installation
This guide provides step‑by‑step installation instructions for the Crouzet NTR 774 B controller. It covers safety precautions for explosive‑hazard environments, mechanical mounting, wiring, and grounding requirements.
The document also details Modbus communication settings, default parameters, and programming via the Millenium 3 software. Technical specifications such as operating temperature, humidity range, IP rating, and power factor are listed for reference. This manual is written in Spanish.
| Operating temperature | -20 °C to +55 °C |
|---|---|
| Relative humidity | 30 %–95 % RH (non‑condensing) |
| IP rating | IP20 |
| Power factor (CSA certification) | 25 % |
| Maximum slaves per Modbus network | 32 |
| Maximum slaves with repeaters | 247 |
| Default Modbus settings | 2‑wire, RTU, even parity, address 1, 19200 baud |
The controller supports up to 32 slaves on a Modbus network.
By default the controller uses a 2‑wire RTU mode with even parity, address 1 and a baud rate of 19200.
Power must be turned off and the area verified as non‑hazardous before any installation, wiring or maintenance.