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SIEMENS 3TK2827-1AJ20 safety relay

Applications of the 3TK2810-0 safety relay

You can use the 3TK2810-0 safety relays for safety standstill detection on 3-phase and 1 phase induction motors, e.g. to disengage protective door release mechanisms on machine tools or to activate stopping brakes.

Description of function and connection information

The 3TK2810-0 safe stillstand monitor measures a voltage of the coasting motor induced by remanent magnetization at 3 terminals of the stator winding. If the induction voltage approaches 0, this means motor standstill for the device and the output relay is activated. To enable adaptation of the device to the most varied types of motors and applications, the voltage threshold Uan, below which the 3TK2810-0 detects standstill, can be set. The duration for which Uan must be undershot to detect standstill definitively and enable the output circuit can also be set (standstill time ts). The device also detects wire break between the measurement inputs L1 / L2 / L3. If a wire break is detected, the output relay goes into the safe position (as it does when the motor is running). This state is stored and can be cleared by (briefly) jumpering terminals X2 - X3. X1 - X2: Feedback circuit for connecting external contactors (NC contact). If the feedback circuit is not required, terminals X1 - X2 must be jumpered; otherwise a fault will be signaled.

Device properties

● PLe per EN ISO 13849-1; SIL 3 per IEC 61508 / IEC 62061

● Wire-break detection in the measurement circuit

● Positive-action safe output contacts: 3 NO contacts, 1 NC contact for 250 V AC

● 2 semiconductor signaling outputs

● 1 changeover signaling output

● Settable voltage threshold Uan

● Settable standstill time ts

● LED displays for motor standstill, wire break, and operating voltage

● Suitable for use with frequency converters