Safety Applications
TeSys Giga advanced contactors and TeSys Giga standard contactors can be used in safety applications. In such applications they are parts of the safety chain as safety related components and switch off the motor supply performing a Stop Category 0 as defined by IEC 60204-1.
They are controlled by the outputs of a safety PLC or a safety relay or a safety switch and provide a highly reliable monitoring of their status, if needed, thanks to the mirror auxiliary contacts.
Auxiliary contacts give an indication of the contactor status. They can be used for remote visual signalling, alarming, electrical locking, relay activation, etc...
Each contactor is equipped with 1 NO + 1 NC auxiliary contact module as standard. The NC contact of the auxiliary contact module is mirror contact in conformity to IEC 60947–4–1 and it is mechanically linked to reliably represent the state of the main power contacts and wherever auxiliary contact state reliability is essential. The main power contacts and the NC of the auxiliary contact can’t be closed at the same time.
Type of connection: push-in type.
The use of a mirror contact wired to an input of the safety PLC or the safety relay and read continuously by the system allows to increase the diagnostic coverage of this subsystem up to 99%.
4 electrical diagrams are possible to perform a Stop Category 0 according to:
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The type of contactor, advanced or standard.
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The control mode of the advanced contactor.
 WARNING |
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UNINTENDED EQUIPMENT OPERATION
Size the command components according to the characteristics
of the contactor control module.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
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Advanced Contactor Without Using the PLC Inputs
The PLC Input switch of the advanced contactor is on the OFF position.
In case of safety stop, the poles are open as soon as the control voltage is removed from A1-A2 control module terminals.
The characteristics of the components that controls the contactor must be compatible with the characteristics of the control module.
Advanced Contactor Using the PLC Inputs for Standard Operation and for the Safety Stop
The PLC Input switch of the advanced contactor is on the ON position.
A1-A2 control module terminals are used to supply the electronics and the coil of the control module.
X1-X2-X3 control module terminals are used to close and open the contactor in standard operation or safety stop. In case of safety stop, the poles are open as soon as the command on X3 terminals is OFF. The input X3 is fail-safe.
The characteristics of the components that controls the contactor must be compatible with the characteristics of the control module.
Advanced Contactor Using the PLC Inputs for Standard Operation and Removing the Control Voltage on A1 A2 in case of Safety Stop
The PLC Input switch of the advanced contactor is on the ON position.
A1-A2 control module terminals are used to supply the electronics and the coil of the control module.
X1-X2-X3 control module terminals are used to close and open the contactor in standard operation.
In case of safety stop, the poles are open as soon as the control voltage is removed from A1-A2 control module terminals.
The characteristics of the components that controls the contactor must be compatible with the characteristics of the control module.
Standard Contactor
In case of safety stop, the poles are open as soon as the control voltage is removed from A1-A2 control module terminals.
The characteristics of the components that controls the contactor must be compatible with the characteristics of the control module.
SIL2 Application Example
SIL2 application example of guard monitoring with
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coded magnetic switches
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safety module
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two advanced contactors using the PLC Inputs for standard operation and for the safety stop
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Number |
Device |
Remarks |
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1 |
XCSDMP590L01M12 |
Two coded magnetic switches with antivalent outputs (one NO, one NC each). |
|
2 |
LC1G●●●A |
Two TeSys Giga advanced contactors The hardware overview does not show details on the connection between the mirror contacts of the advanced contactors and the safety module. |
|
3 |
XPSUS12 |
Safety module |
|
4 |
Harmony XB4 |
Push-button for monitored start/restart. This push-button is used to provide the signal to exit the defined safe state of the Safety Chain Solution. it does not start/restart the overall machine or process. |
|
5 |
ABL●●● |
Power supply |
|
6 |
M221 Logic controller |
Digital input connected to status output of safety module |
|
7 |
Motor |
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For application examples refer to Safety Chain Solution Guide.
Safety Stop Category 0 Test Procedure
The Safety Stop Category 0 function must be tested at regular intervals, in accordance with standards and local regulation.
In absence of local regulation, Schneider Electric recommends to carry out the Safety Stop Category 0 test procedure once a year.
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Switch off the power by opening the upstream circuit breaker or switch-disconnector.
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Close the contactors(s).
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Push the emergency stop push button.
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Check that the contactor(s) are open.
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Check that the NC auxiliary contacts of the contactor(s) (21-22, 31-32, 61-62, 71-72) are closed.
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Rearm the emergency stop system.
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Close the contactors(s).
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Check that the NC auxiliary contacts of the contactor(s) (21-22, 31-32, 61-62, 71-72) are open.
If one of the checks is not successful, refer to Troubleshooting.