Rexroth Indramat Gmbh

Dierk Gress

Harald Kramer

The electronic monitoring circuit for monitoring one of a group of series-connected capacitor units in an intermediate circuit in order to detect short-circuiting of one of the capacitor units includes a device for deriving a reference voltage () from an intermediate-circuit voltage (L(+), L(&#x2212;)) applied across the series-connected capacitor units (), a device for generating a control signal consisting of a voltage difference between the reference voltage () and a junction voltage at a junction () between two capacitor unit () and a device for generating an error signal when said voltage difference falls below or exceeds an activation threshold voltage thus indicating that one of the capacitor units () has been short-circuited. The activation threshold voltage corresponds to a breakdown voltage of a zener diode provided in the monitoring circuit.

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Hammelburg, Germany

Dierk Gress