Conditions Of Utilization Sto (=Safe Torque Off) Safety Function; Notes On The Sto Function - Parker Compax3 Operating Instructions Manual

Compax3 device description
82
3.10.2.2 Conditions of utilization STO (=safe torque off) Safety
function
STO can only be implemented in Compax3 with a corresponding safety switching

device considering the application examples.
Safety functions must be tested 100%.

The Compax3S and the safety switching device used must be mounted in a

protected way (IP54 mounting cabinet).
Only qualified staff members are permitted to install the STO (=safe torque off)

function and place it in service.
For all applications in which the first channel of the "Safe torque off" is

implemented by means of a PLC, care must be taken that the part of the program
that is responsible for current flowing to or not flowing to the drive is programmed
with the greatest possible care. The Safe Torque off application example of
Compax3 with fieldbus should be considered.
The designer and operator responsible for the system and machine must refer
programmers who are involved to these safety-related points.
Terminal X4/2 (GND 24 V and at the same time the reference point for the safety

relay bobbin) must be connected with the PE protective lead. This is the only way
to ensure protection against incorrect operation through earth faults (EN60204-1
Section 9.4.3)!
All conditions necessary for CE-conform operation must be observed.

When using an external safety switching device with adjustable delay time, (as

illustrated in the STO application example), it must be ensured that the delay time
cannot be adjusted by persons not authorized to do so (for example by applying a
lead seal). With the UE410-MU3T5 safety switching device, this is not necessary,
if the anti manipulation measures are respected.
The adjustable delay time on the safety switching device must be set to a value

greater than the duration of the braking ramp controlled by the Compax3 with
maximum load and maximum speed.
If the setting range for the specified Emergency power-off module is not sufficient,
the Emergency power-off module must be replaced by another equivalent
module.
All safety-related external leads (for example the control lead for the safety relay

and feedback contact) must absolutely be laid so they are protected, for example
in a cable duct. Short circuits and crossed wires must be reliably excluded!
If there are external forces operating on the drive axes, additional measures are

required (for example additional brakes). Please note in particular the effects of
gravity on suspended loads!
3.10.2.3

Notes on the STO function

It should be noted in connection with the STO (= safe torque off) application

example illustrated here that after the Emergency stop switch has been activated,
no galvanic isolation in accordance with EN 60204-1 Section 5.5 is guaranteed.
This means that the entire system must be disconnected from the mains power
supply with an additional main switch or mains power contactor for repair jobs.
Please note in this regard that even after the power is disconnected, dangerous
electrical voltages may still be present in the Compax3 drive for about 10
minutes.
During the active braking phase of Stop category 1 (controlled bringing to a stop

with safely monitored delay time according to EN60204-1) or safe stop 1, faulty
function must be expected. If an error in the drive system or mains failure occurs
during the active braking phase, the axis may trundle to a stop unguided or might
even actively accelerate until the expiry of the defined switch-off time.
Please note that the control of the drive via Energize (Energize input or fieldbus

interface) is not executed in all operating conditions. The following restrictions
apply when the set-up window of the C3 ServoManager is used:
If the setup mode is switched on, the fieldbus interface and the energize input

are blocked.
the energize input can be ignored if the input simulator is activated (depending

on the settings).
192-120113 N08 C3I12T11 - December 2010
C3I12T11