Parker AC890PX Series, Product Manual

Page: 93 / 517

4-27
Safe Torque Off
AC890PX AC Drive
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. The use of this Siemens part does not imply it is suitable for the user’s application. The user must
select and assess appropriate equipment.
*Note 1: Refer to manufacturers’ instructions for wiring and earthing detail.
Note: On power-up, the safety control unit outputs are OPEN; thus the STO state is requested of the 890.
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 4-16.
X11/01 X11/03 X11/06 X15/02 X15/03 X14/03
DRIVE
START
DRIVE
STOP
SAFETY
DEMAND
890 STO
X11/02 X11/04 X11/05
X14/04
24VDC
SAFETY CONTROL UNIT
A1 Y12 Y11 Y10 Y21 Y22 13 23
RESE
T
KA1
KA1
A2 PE Y33 Y34 14 24
POWER
SUPPLY
*Note 1
THIS WIRING MUST BE WITHIN THE CONTROL CUBICLE.
0V