PS
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PS SINGLE PHASE Pump Protection Relay without Level Sensors PS 11-R SINGLE PHASE PUMP PROTECTION PROTECTION FUNCTIONS Underload protection by undercurrent • Eliminates need for level sensors to detect dry running. • For 1-phase motors from 3 to 16 A. • Precise motor heating and cooling memory, reproduces its thermal image. • Visual indication of trip cause. • Adjustable reset time for . Undercurrent Overvoltage Suitable for 1-phase submersible pumps. By monitoring undercurrent it avoids problems caused by dry running, cavitation, etc. The great advantage of the PS relay is that, without requiring any external detectors like level electrodes, it monitors the load of the motor and stops it before an expensive breakdown occurs. WITHOUT LEVEL SENSORS WITHOUT LEVEL SENSORS single phase single phase according to the relay voltage supply (+15% -10%) ac: 50/60 Hz Adjustment range Motor 400 V 50/60 Hz From 0,4 to 0,9 x B / 5 s From nominal V + 15% automatic (adjustable) and remote. More info in page 110 Reset mode for other protection functions Signalling LED’s Output contacts Switching power Terminals: Max. section / screw torque Power consumption Protection degree / weight / mounting Storage temperature Operating temperature / max. altitude Standards automatic. More info in page 110 Settings and curves, see pages 105 to 111. Reset mode for protection against dry running Thermal memory / Overload trip Maximum motor nominal voltage Trip classes (IEC 947-4-1) Undercurrent protection adjustable / Trip delay Overvoltage protection (1) PS 16-R: pass the wire through the h