The CM-LWN relay is from the CM motor load monitors range. This relay operates with a rated control supply voltage of 24-240 V AC / DC, has a 2 x 1 c/o (SPDT) output with contacts rated at 250 V / 4 A and works according to the closed-circuit principle. Its measuring principle is based on the evaluation of the phase shift between the voltage and the current in one phase of single- or three-phase asynchronous motors (squirrel cage).
Function :Motor load monitoring
Measuring Range : 2-20 A @ 110-500 V AC
Rated Control Supply Voltage (Us) : 24 … 240 V AC/DC
Rated Frequency (f) : DC 15 … 400 Hz
Output : 2 x 1 c/o (SPDT) contact
Time Range : 0.3-30 s start-up delay; 0.2-2 s tripping delay
Terminal Type : Screw Terminals
The measuring circuit is designed for measuring voltages of 110-500 V AC and measuring currents of 2-20 A AC. The window (over- and underload) monitoring allows setting of two individual threshold values, one for maximum load and one for minimim load. The hysteresis is fixed at 4 ? related to the phase angle. The tripping delay is adjustable within a range of 0.2 to 2 s and the start-up delay within a range of 0.3 to 30 s. A sealable transparent cover for protection against unauthorized changes is available as accessory.