Sto Implementation With Safety Control Unit - Parker AC30P User's Product Manual

6-22
Safe Torque Off

STO IMPLEMENTATION WITH SAFETY CONTROL UNIT

This example improves on the previous one by showing the resetting from a STO stop. The example shows wiring and terminal numbering for a
Siemens 3TK2827, but similar products are available from other vendors. Use of this Siemens part does not imply it is suitable for the user's application.
The user must select and assess appropriate equipment.
POWER
SUPPLY
Note: On power-up, the safety control unit outputs are OPEN; thus the STO state is requested of the inverter. The latter responds by energising KA1 if both
channels are active and healthy. KA1 is used as a self-check for the reset cycle of the safety control unit. If a reset cannot be achieved due to KA1
being de-energised, a fault may be present and must be resolved by the user before relying on the STO function. See Fault Operation on page 6-14.
SAFETY
DEMAND
A1
Y10 Y11 Y12 Y21
SAFETY CONTROL UNIT
PE Y33
A2
RESET
KA1
THIS WIRING MUST BE WITHIN THE CONTROL CUBICLE.
13 23
Y22
Y34
14 24
24VDC
DRIVE
STOP
DRIVE
START
X10/01 X10/03 X10/06
X13/02
INVERTER STO
X10/02 X10/04 X10/05
KA1
AC30 series Variable Speed Inverter
X12/01 X12/05
X12/06