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Start/restart interlock (RES)
The start/restart interlock function prevents the safety circuits from being released automatically when the machine is turned on or the power supply is restored after a power outage. Only by pressing and releasing the start button within a time window is the receiver switched to the ON-state.
Contactor monitoring (EDM)
The "Contactor monitoring" function dynamically monitors contactors, relays or valves downstream from the SOLID-4E. Precondition here are switching elements with positive-guided feedback contacts (normally closed).
Diagnostics function: Dirt and error signal output
For diagnostic purposes SOLID-4 has a short circuit-proof “Weak Beam/Error Indication” signal output for forwarding to the machine control unit. Information on connection of the signal output and a connection example can be found in Chapter 7.
Test input
As a type 4 AOPD, SOLID-4 has a constant self-monitoring function that independently detects errors in the system as well as cross and short circuits on the output cables of the machine interface. An external test signal is not required for this. To test the downstream contactors, an external control (e.g. protective combination) via a test signal (= pin4 of the transmitter to 0 V or free) can switch off the OSSD outputs of the receiver and test the drop-out of the switching elements. The test time signal time is a maximum 3 seconds. After the test the OSSDs also go to the ON-state with activated start/restart interlock, provided the protective field is not interrupted.
Option of selecting different transmission channels:
Two different, configurable channels, prevent unintentional faulty switchovers caused by optical cross-talk of adjacent devices.
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