Safety Function - Safe Standstill - Compax3S; Safe Standstill With Compax3 Principle - Parker Compax3S025V2 Operating Instructions Manual

Compax3 device description
3.9 Safety function – safe standstill – Compax3S
3.9.1.

Safe standstill with Compax3 principle

68
In this chapter you can read about:
Safe standstill with Compax3 principle ..............................................................................................68
Devices with the "Safe Standstill" safety function..............................................................................69
Safety instructions for the "safe standstill" function ...........................................................................70
Application example for "safe standstill" ............................................................................................71
Compax3S is equipped with the "Safe Standstill" safety feature.
The "protection against unexpected start-up" described in EN1037 can be
implemented with this feature.
To ensure safe protection against a motor starting up unexpectedly, the flow of
current to the motor and thus to the power output stage must be prevented.
This is accomplished for Compax3 with two measures independent of each other
(Channel 1 and 2), without disconnecting the drive from the power supply:
Channel 1:
Activation of the power output stage can be disabled in the Compax3 controller by
means of a digital input or with a fieldbus interface (depending on the Compax3
device type) (deactivation of the energize input).
Channel 2:
The power supply for optocouplers and drivers of power output stage signals is
disconnected by a safety relay activated by the enable input "ENAin"(X4/3) and
equipped with force-directed contacts. This prevents control signals from being
transferred to the power output stage.
The "Safe Standstill" safety function as defined by EN 954-1 Category 3
is only possible if both channels are used.
Circuit diagram illustrating working principle:
Channel 1
Controller
Energise
Feedback
Compax3
Feedback
power
supply
controller
192-120101 N11 C3I11T11 November 2007
Channel 2
ENAin
Feedback
(Enable)
X4/3
power
supply
safety relay
Positioning via digital I/Os
L1 L2 L3
X1/1 X1/2 X1/3
X4/4 X4/5
motor