Electronic Safety Sensors and Solenoid Interlocks
  Technology and user
advantages
The electronic monitoring
of moving safety guards,
including actuation, in
non-contact solenoid
interlocks, enables the
wear-free and non-contact
detection of the respective
actuator. The patented
pulse-echo technology
permits large tolerances in the approach of the coded actuator,
both in the switching distance and the misalignment. Despite this, the switching points and hysteresis are extremely repeatable and
constant. The performance and capabilities of the safety sensors
and solenoid interlocks are covered by the following testing
standards:
• Defined behaviour under fault conditions to EN 60947-5-3
• Requirements on safety related parts up to PL e to
EN ISO 13849-1 or CC4 to AS4024
• Requirements of EN 61508/ use up to SIL 3 applications
The use of microprocessor technology ensures intelligent
diagnostic as well as smooth and fast failure detection, e.g. in the
case of cross-shorts or wiring errors. The safety channels of the
electronic sensors and electronic solenoid interlocks can be wired in
series to build a chain of up to 31 components, depending on the
type of device used, and as a result of the independent functional
check, CC4 is retained for this series-wired chain.
Operating principle
All products of the CSS series have the same operating principle.
They use the pulse-echo technology patented by Schmersal to
detect the actuator. The sensor emits electromagnetic pulses,
and when the actuator approaches the sensor, the actuator starts
oscillating at a predetermined resonant frequency due to the
induced energy. These oscillations are in turn read by the sensor.
While doing this, the sensor evaluates the distance with regard to
the actuator as well as the coding of the actuator. The actuator
identified by the sensor is interpreted as a closed safety guard and
the safety outputs are enabled. |
