Hello,

what means timing setting of safety relay 3TK2827/28? If I good understand manual that means 47,48 and 57,58 contact off delay time. Am I correct?

sarunas.z

Hello,

what means timing setting of safety relay 3TK2827/28? If I good understand manual that means 47,48 and 57,58 contact off delay time. Am I correct?

 Hello,

 yes you are right

sarunas.z

maybe samebody can give to me example why it need.

 Hello,

certain condition for some machine need time to safety stop 

sarunas.z

maybe samebody can give to me example why it need.

 Hello,

 an example: you have a machine with inverter in DC-BUS so you cannot cut the power above the drive, therefore you have the power contactor between the output of the drive and the motor, so if an emergency stop arrives you cannot open immediately the power contactor otherwise the drive goes into Fault, If  you not have some like STO (Safe Torque Off) on the drive. Then first remove the controls and then cut the power with a certain time safely