Description
Key Technical Specifications
- Product Type: Switchgear-mounted HMI module for REF542plus system
- Application: Medium-voltage feeder protection and bay control panels
- System Integration: Works with REF542plus protection and control unit architecture
- Supply Voltage: 48–110 V DC or 110–220 V AC (variant dependent)
- Display Type: LCD graphical screen
- User Interface: Front keypad with menu navigation and alarm acknowledgment
- Communication: RS485 / service port; Ethernet or PROFIBUS DP depending on configuration
- Protocol Support: Modbus RTU, PROFIBUS DP (variant dependent)
- Operating Temperature: −20°C to +70°C typical industrial range
- Storage Temperature: −40°C to +85°C
- Power Consumption: Low-power interface module (≈5 W class in similar HMI builds)
- Weight: ~0.7–0.8 kg typical for this HMI family
- Protection Class: Panel-mounted industrial front interface (IP30–IP54 depending enclosure)
Product Introduction
ABB REF542PLUS 1VCF750090 is the local HMI operator interface used with REF542plus medium-voltage protection and bay control systems. The module provides status visualization, alarm handling, parameter navigation, and local breaker control access in switchgear environments.
Field installations typically pair this HMI with a separate REF542plus central protection unit. Communication stability depends heavily on firmware alignment and correct serial or fieldbus configuration. In retrofit work, mismatched HMI revisions or incorrect addressing is a frequent cause of “no display / no comms” troubleshooting calls.
