This unit specifically is designed to perform speed alarming under safety aspects. Its plausibility test actuates one of its alarms, when the measured value – from whatever reason - is found below or above the programmed operating range. The incorporated sensor monitor checks current industrial drain, short circuit and signal presence (if applicable) with programmable influence on the said plausibility test, and on the other speed alarms. Power failure can be programmed for a defined output condition of the alarms, observing safety aspects of the application.
Combining two units results in a high failsafe system. One unit or sensor may be swapped without interruption of the monitored machine.
Design for snap on standard rail. Function volume optional with 2 or 4 alarm outputs and one analog speed signal. RS232 data interface is standard. The proven pulse interval measuring principle provides a fast reaction of 5 milliseconds. Per program this may be extended to achieve larger averaging of the measurements. Setpoint of the alarms programmable between zero and any speed. Two alarms have SPDT contacts, two more offer solid state electronic switches. All individually programmable for their setpoint, their response characteristics, their condition on sensor failure and during the (programmable) starter state. The analog output provides a 20mA/10V signal, with programmable span. The signal input of the unit preferably accepts no-contact electronic detection (another specialty of Braun GmbH) but also an incremental encoder or a tachogenerator, or any other professional transmitter with a pulse train as its output. Frequency range 0-300 kHz. Response level and transient frequency are adjustable. A programmable input frequency divider may compensate unequal pulse distances.
The pulse output of the unit provides shaped pulse signals to a speed governor or other device, with the original sequence or isolated following the input divider.
Suppliers of power supply with one range 20 -265 V AC/DC.