Emotron EL-FI M20 Shaft Power Monitor

The Emotron EL-FI M20, also known as the Emotron M20, monitors motor shaft power to detect abnormal machine loads. It helps protect pumps and other motor-driven equipment from damage caused by underload or overload.

Monitor the load using the motor as a sensor

The M20 calculates shaft power from electrical measurements, avoiding the need for a separate mechanical load sensor. It can detect conditions such as a pump running dry or a crusher jamming, allowing the control system to warn an operator or stop the equipment.

Key features

• Underload and overload monitoring.
• Two output relays for integration with the machine control circuit.
• Scalable analogue output for load indication or a PLC input.
• Display for load readings and parameter setup.
• Auto set calculates warning and stop thresholds from the normal operating load.
• IP20 protection for installation in a suitable enclosure.

Selecting an M20

Supply versions cover 100–240, 380–500 and 525–690 V AC at 50 or 60 Hz. Current monitoring extends to 999 A with suitable current transformers; above 100 A, an additional transformer is required.

For selection and application advice, provide:

• The motor nameplate voltage, current and power.
• The machine type and the fault conditions you want to detect.
• The normal load variation and starting time.
• The existing starter or drive arrangement and control circuit details.
• The required alarm behaviour and analogue signal connection.

Documentation and replacement units

See the manufacturer's M20 product page for specifications, current transformer information and manuals, including earlier EL-FI M20 instructions. Match the manual to the installed unit before checking wiring or settings.

Frequently asked questions

What does the M20 monitor?

The M20 monitors calculated motor shaft power to detect underload and overload in the driven equipment.

Does the M20 control motor speed?

No. The M20 is a load monitor. Its outputs connect to the machine control system for indication, warnings or stopping; it does not provide variable speed control.

What should I send when replacing an existing unit?

Send photos of the M20 label, current transformer label and motor nameplate, together with the wiring diagram and a description of the application.

Emotron EL-FI M20 support in New Zealand

Contact Advanced Motor Control Ltd to discuss M20 selection or a replacement for your installation. Enquire about the Emotron M20 or call 0508 000052.