The monitoring relays PMDsigma from Pilz offer the ability to set values simply via a rotary knob and then safe them on a chip card. That way data can be copied over to other units. A plain text display supports parameter setting while also providing user-friendly diagnostics. The first unit in the PMDsigma product range, PMD s10, monitors true power and provides an indication of the motor load through the true power. It monitors the thresh-olds, while at the same time providing an analogue voltage or current value which is proportional to the the true power. This means that both the overload and underload thresholds can be monitored via an analogue signal (PLC) or via the integrated relay. The relay can process frequencies from 0 up to 1000 Hz. It is therefore flexible and is suitable for both DC and AC motors as well as frequency-controlled drives.
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