Phase sequence monitoring relay MXP-10

three-phaseACDIN rail

Brodersen's MXP-10 Phase monitoring relay is a relay for monitoring the supply voltage for motors, to secure that the correct phase parameters are available for starting up and during operation. By phase failure the regenerated phase can be detected via asymmetry or low voltage (limit adjustable down to 95% of the measuring voltage). A relay for monitoring a 3-phase AC power supply with or without Neutral. The relay monitors that all phases are available and in the correct phase sequence (U,V,W), that none of the phases are shifted more than 20°C in relation to each other and that one or more of the phase voltages are not too low. When all three monitoring criteria are fulfilled the relay is activated. If one or more of the criteria are not fulfilled the relay de-energises and a red LED indicates failure. The nominal phase voltage is adjustable ± 15% of the selected voltage version (3 x 115/3x230/3x400VAC). The lowvoltage limit is also adjustable from 60-98% thus allowing detection of a motor-generated phase. With connection of Neutral the measuring abilities are optimal, as Neutral works as a measuring reference. Without Neutral, the phase monitoring relay generates a Neutral reference from the connected phases. Features • Monitoring of • Phase rotation • Phase shift less than 20° • Low voltage • Adjustable measuring voltage Un +/- 15% of rated voltage Un. • Low voltage detection, adjustable 60- 98% of measuring voltage Un. • Output SPTD. • Operating voltage via phases V and W (L2 and L3).