The safety chain of the machine is interrupted at one location or the safety relay, main contactor or relay for triggering the safety relay is defective.
The safety chain of the machine is broken; the LED on the safety relay does not light up: check the safety chain.
The safety chain of the machine is not broken; the LED on the safety relay lights up.
The relay used to control the safety relay is defective.
The contacts on the main contactor are jammed.
The monitoring contact is open.
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