Patent ID: 6344722
Filing Date: 2002-02-05
Classification: F04B

Abstract:
A control device for a diaphragm pump to feed a filter press, comprisinga three-phase electric driving motor (16) for the pump (18) which is connected to a supply mains via a variable-frequency converter (21), which frequency converter has an analogue output (22) at which a signal will appear which corresponds to the respective motor torque, a standard r.p.m. set-point adjuster (30) to the input of which the actual signal is provided via an inverter (28) and in which a graph is stored which produces an interdependence between the motor torque and the speed such that if the actual-signal rates are small the graph for the speed runs along a constant maximum value and if a preset rate is reached for the actual signal it gradually declines to a minimum value, and an attenuation member (23) for the actual signal.