How to configure the safety function SLS for the safety module VW3A3802.
Hello today, we will show you how to configure the safety function SLS (Safely Limited Speed)
with the safety module VW3A3802.
The safety function SLS prevents the motor from exceeding specified frequency limit.
The safety module limits the motor frequency between the SLS frequency limits.
The safety function SLS can be used when someone has to perform actions in a restricted area close to a running machine.
For instance, when an operator needs to grab an item in a running machine
or when a baker needs to knead the dough whereas the dough trough is still running.
Six types of SLS are available with the safety module VW3A3802.
Select the type fulfilling the requirements of your application.
This table shows some criteria depending on the type of SLS.
For more information about each type of SLS refer to the safety function manual.
In this video we will focus on SLS Type 5.
Without details, at SLS activation, 3 cases can be listed according to the motor frequency:
It exceeds the threshold: the motor frequency is reduced until the value is within the setpoint boundaries.
Between the threshold and the setpoint: the motor frequency is reduced until the value is within the setpoint boundaries.
Within the setpoint boundaries, the motor frequency is limited to values within the setpoint boundaries.
Irrespective of the case, once SLS is activated, the motor frequency is monitored by the safety module.
To configure SLS, connect the drive to SoMove
After the configuration of the motor and encoder parameters for both the drive and safety module,
configure the safety function SS1
and Start Mode input to SI5.
Set SC25 to assign a safety-related input to activate the safety function SLS.
In this example, the selected safety-related input is wired to the safety door interlock switches
giving the state of the door (opened or closed)
Set SC39 according to the SLS Type needed
SC48 and SC49 are used to configure the thresholds for both positive and negative directions.
With SLS type 5, if the motor frequency exceeds the threshold at SLS activation,
the motor frequency automatically decreases following a ramp.
Afterwards, in case of an unexpected, the motor is stopped and an error is triggered.
Note that SC49 is automatically set to SC48 value. It cannot be modified.
SC50 and SC51 are used to configure the setpoints for both positive and negative directions.
With SLS type 5, if the motor frequency exceeds the setpoints at SLS activation,
the motor frequency automatically decreases following a ramp to have a motor frequency within the setpoint boundaries.
Afterwards, the motor reference frequency is limited to values within the setpoint boundaries.
Note that SC51 is automatically set to SC50 value. It cannot be modified.
SC40, SC41 and SC43 are used to configure the deceleration of the motor frequency at SLS activation
in case the frequency is greater than the setpoints and/or thresholds.
Set SC40 to define the deceleration ramp to be followed by the motor frequency.
The deceleration of the motor is monitored by a ramp.
Set SC43 to define the offset for the monitoring deceleration ramp.
Note that SC41, the monitored ramp, is automatically set to SC40 value. It cannot be modified.
Once the configuration is done, transfer it to the drive
and activate the safety configuration by entering the activation code via the Graphic Display Terminal.
The machine is ready to test the safety function SLS
According to your risk assessment, perform an acceptance test of your machine
In our example of application, the thresholds are defined to monitor unexpected overspeeds according to the machine sizing.
The setpoints are defined when a maintenance is carried out
For example, an operator wants to access the machine to grab an item or to perform an action without stopping it.
SLS is activated by opening the door.
After a deceleration, the machine runs at the defined safely limited speed to avoid unexpected events.
The operator can perform the authorized action on the machine
then deactivating SLS allows the machine to go back to its nominal operation.
When an error is triggered, access the Graphic display terminal and scroll to the bottom of the window
to have more information about the triggered error.
To run the motor after an error has been triggered, verify the probable causes
and clear them then try to reset the error, apply the start signal then run the motor.
Note that not all errors are resettable. If the error cannot be reset, a drive power cycle is required.
To verify which error can be reset, refer to your product safety function manual with Module VW3A3802.
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