Configuration
6.11 Contactors in safety applications
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
119
Hazardous Voltage
Can Cause Death, Serious Injury, or Property Damage.
Safe State (Safety Concept)
The basis of the safety concept is that a safe state exists for all process variables. On the
contactors with fail-safe control input, this is the value "0". This applies to sensors and
actuators.
Hazardous Voltage
Can Cause Death, Serious Injury, or Property Damage.
Carry out function test of the system after changes
To ensure the safety of the system, any changes to it or any replacement of defective
components must be followed by a thorough and successfully completed function test of
the system.
A complete function test consists of the following tests:
• System test (wiring test of the connected sensors and actuators)
Hazardous Voltage
Can Cause Death, Serious Injury, or Property Damage.
Test interval for electromechanical actuators, e.g. contactors or relays
When actuators such as contactors or relays are used in continuous operation, a function
test interval (shutdown test) ≤ 1 year is necessary for SILCL 2 or ≤ 1 month for SILCL 3.
Only then do the safety values apply.
Function test procedure for actuators with contacts:
• Actuate the connected sensors.
• Check their effect on the actuators.
• Activate the actuators by means of relevant statuses at the connected sensors.
• Check the effect on the actuators.
• Defective devices must be replaced.
To Next Page
Loading...
