The motor load monitor CM-LWN monitors the load of single-phase and three-phase asynchronous motors. The evaluation of the phase angle between current and voltage (cosφ monitoring) allows a very precise monitoring of the load status.

Characteristics of CM-LWN motor load monitors

• 2 x 1 c/o (SPDT) contact
• Wide- or single-supply voltage range
• Under- and overload monitoring in one unit (window monitoring)
• Direct measurement of currents up to 20 A*, higher ratings possible with external current transformers CM-CT
• Single-phase or three-phase monitoring
• Adjustable ON-delay (0.2 - 2 s)
• Adjustable start-up delay (0.3 - 30 s)
• Adjustment of threshold values (trip points) and time delays via direct reading scales
• Setting and operation via front-face operating controls
• LEDs for status indication
• 45 mm wide enclosure
• Integrated and snap-fitted front-face marker
• Sealable transparent cover (accessory)
• Adapter for screw (surface) mounting (accessory)

Examples of application

• Detection of V-belt breaking
• Motor protection against overload
• Monitoring of filters for clogging
• Protection of pumps against dry running
• Detection of high pressure in conduit systems
• Monitoring for dulling blades in sawing and cutting machines