Sto (= Safe Torque Off) With Compax3M (Option S1); Safety Switching Circuits; In This Chapter You Can Read About: Safety Switching Circuits - Parker Compax3 Operating Instructions Manual

Compax3 device description
3.10.3.

STO (= safe torque off) with Compax3m (Option S1)

In this chapter you can read about:
Safety switching circuits .................................................................................................. 88
Safety notes for the STO function in the Compax3M ....................................................... 89
Conditions of utilization for the STO function with Compax3M ......................................... 89
STO delay times ............................................................................................................. 90
Compax3M STO application description ......................................................................... 91
STO function test ............................................................................................................ 94
Technical details of the Compax3M S1 option ................................................................. 96
88
3.10.3.1

Safety switching circuits

The current flow in the motor windings is controlled by a power semiconductor
bridge (6-fold IGBT). A processor circuit and PWM circuit will switch the IGBT with
rotary field orientation. Between control logic and power module, optocouplers are
used for potential separation.
On the Compax3M drive controller with S1 option, the X14 (STO) connector can be
found on the front plate. 2 optocouplers are controlled on two channels via the
STO1/ and STO2/ terminals of this connector. When requesting the STO via an
external safety switching device, the two auxiliary voltage supply channels of the
power stage control circuits are switched off on two channels. Therefore the power
transistors (IGBTs) for the motor current can not longer be switched on.
The hardware monitor detects the failure of the optocoupler circuit of a channel by
always checking both channels for similarity. If the hardware monitor detects a
discrepancy for a defined time (ax. 20s), the error will be stored in the hardware
memory. The processor signals this error externally via the 0x5493 error code. An
activation of the coupler supply can then only take place via a hardware reset
(switching off and on again) of the device.
X14.1
X14.2 STO-GND
X14.3
X14.4 STO-GND
* Potential separation with optocoupler.
192-120113 N08 C3I12T11 - December 2010
+5V
Hardware
Monitor
STO1/
STO2/
C3I12T11
Compax3M ...S1
Controller
Software
PWM
*
6 IGBT
Driver