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PROTECTION

Smartmotor Relay PMC-550D: Advanced Motor Protection and Control

Protecting a motor is not only about preventing a burnt winding - it is about safeguarding production, safety and plant availability. In a single compact DIN-rail device, the Smartmotor relay brings together everything that used to require several separate units: complete electrical and mechanical protection, motor starting and control, power quality metering, and temperature and insulation monitoring. Its modular design lets you start with the essentials and expand as your needs grow, while native integration with SCADA/DCS systems over Modbus and PROFIBUS makes it ready for modern industrial environments. Fewer panels, fewer points of failure, greater reliability.

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Technical Information

Smartmotor Relay installation requirements
To ensure the integrity and correct operation of the equipment, the main PMC-550D relay and its expansion modules must be mounted on standard DIN rail, in dry indoor environments free of dust and away from heat sources, radiation or electrical noise interference. The display interface module (HMI) is designed for flush mounting on the panel door and requires an exact cut-out of 103 mm x 54 mm. The system offers wide supply flexibility, with the power terminals operating over a range of 95 to 250 VAC/VDC. As a critical safety measure, safe earthing is strictly mandatory: the relay GND terminal must be connected to the installation chassis or panel. Regarding sensing, specific applications with variable frequency drives (VFD) or two-speed control require the current transducers (MTA) to be installed upstream of the circuit, and temperature sensors (PTC/NTC thermistors) must be wired with shielded twisted pair (STP) cable.

HVEX solution for intelligent protection and control of low-voltage motors

The PMC-550D Smartmotor Relay is the HVEX solution for intelligent protection and control of low-voltage motors. Designed to raise the reliability of motors, cables and critical installation components, it combines protection against electrical and mechanical faults, starting schemes (direct-on-line, reduced voltage, forward/reverse and two-speed), fundamental, RMS and harmonic metering, event and waveform recording, plus continuous temperature and insulation monitoring. With a modular architecture and native industrial communication, the PMC-550D scales from simple applications to complex automated systems, protecting both the asset and production.

HVEX | HVEX solution for intelligent protection and control of low-voltage motors

Benefits and Usability

  • HVEX | Operational Reliability and Tailored Intelligent Control
    Operational Reliability and Tailored Intelligent Control

    The PMC-550D Smartmotor Relay is designed to maximise productivity and protect your assets, acting preventively against the electrical and mechanical faults that cause unplanned plant shutdowns. To keep critical processes running, the unit uses a reinforced power supply that keeps protection, control and metering functions active for up to 30 seconds during voltage dips (ride-through). Its modular design adapts to the reality of your installation, allowing easy expansion with additional modules for thermal temperature and insulation resistance monitoring. Beyond its robustness, usability is a key differentiator: custom control logic is configured visually and intuitively (FBD logic) using PMC-Designer software. Predictive maintenance diagnostics are equally straightforward, with extensive storage of motor statistics, start/stop reports and a Waveform Recorder (WFR) exportable in the industry-standard COMTRADE format.

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