This device monitors two movements, e. g. of two drums, on synchronisation. The movements are converted by two incremental encoders (or proximity switches) to pulses, which difference is computed ongoingly. It also provides the supply of the rotary sensors and a debouncing of the sensor pulses. Each sensor is monitored for a possible short-circuit or break of the connection lines.

There are two limit values for the measured difference of the pulses programmable at the factory. The relays assigned to each limit value will switch to their normal state if the measured difference is rising above the associated limiting value.

The limit values must be selected in such a way that play and vibrations in the drives do not cause false relay switchings.

An overspeed detection can take place with a post-connected frequency monitor.

• 2 pulse inputs for 2-phase incremental encoder
  or per 2 proximity switches
• Max. input frequency 1kHz
• Power supply (max. 100mA per sensor)
  and monitoring of the sensors
• Measuring principle: Impulse-difference of the two sensors
• Range of programmable limit values:
  4 to 1008 Impulses, response time 30ms