Active power power transducer WM500

Active-power transmitter WM500 converts active-power of symmetric 1-3 phase power supply systems into proportional industry standard signals. Devices without compensating circuits can be used to measure active-power of phase-angle controlled equipments or electric motor drives controlled by frequency inverters. Devices with integrated compensating circuits (only for sinusoidal voltage) compensate errors which depends on different deviation from line voltages to nominal voltages. Both types work with any curve shape variations of the measuring current. ● For 1- and 3-phase power systems with symmetric load ● Current measuring range 1 A or 5 A ● Power-factor (cos φ) selectable 0.72 or 1 ● Frequency range 45..400 Hz In practice an additional error up to 3 % can occur when 3-phase line voltages are not symmetrical. The WM500 with built-in compensating circuit* eliminates this error nearly completely. *Note: The device with compensating circuit must be connected to the measuring voltage at any time of operation!