How to configure the safety function SMS for the safety module VW3A3802.
Hello, today we will show you how to configure the safety function SMS (Safe Maximum Speed)
with the safety module VW3A3802.
SMS can be used to specify speed limits. If the speed exceeds one of the specified limit values,
the motor is stopped and an error is triggered according to the customer configuration.
SMS can be used to prevent unexpected overspeed or to define specified limits.
For example, during specific maintenance operation.
Note that SMS does not manage the motor frequency reference, it only defines the motor frequency limits.
The motor frequency reference should be set according to defined SMS limits.
There are three modes of SMS.
- 1 threshold: one safe maximum frequency limit for each direction.
- 2 thresholds: two safe maximum frequency limits for each direction.
A safety-related input is used to switch from one safe maximum frequency limit to the other.
- Activated by Safety Input:
One safe maximum frequency limit for each direction activated via a safety-related input.
In this video, we will focus on the '2 thresholds' mode.
To configure SMS, 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 SC56 to select the mode of the safety function SMS.
Set SC26 to assign a safety-related input to switch between safe maximum frequency limits.
In this example, the selected safety-related input is wired to the light curtains.
SC57 and SC58 are used to configure the first set of frequency limits (safe frequency limits 1)
while SC59 and SC60 are used to configure the second set of frequency limits (safe frequency limits 2)
according to the motor direction.
The first set of frequency limit should be equal to or greater than the second set.
Note that the safety-related input assigned on SC26 is used to switch between the sets of frequency limits:
- on the high level of the input, the set of frequency limits 1 is active;
the motor speed should remain within the safe frequency limits 1,
- on the low level of the input, the set of frequency limits 2 is active;
the motor speed should remain within the safe frequency limits 2.
SC61 is used to configure the response to a motor frequency exceeding one of the specified safe maximum frequency limits
according to the active set of frequency limits.
In our example, SC57 is set to 140 Hz, SC58 is set to 140 Hz, SC59 is set to 80 Hz, SC60 is set to 80Hz,
SC61 is set to STO with error.
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 SMS
Following your risk assessment, perform acceptance tests of your machine.
In our example of application, the first set of speed limits is used to monitor unexpected overspeeds
during nominal operation according to the machine sizing: an error is triggered if the speed exceeds -140Hz or 140Hz.
The second set is used when a maintenance is carried out:
an error is triggered if the light curtains is crossed whereas the speed exceeds -80Hz or 80Hz.
Let's have an overview of an operator trying to grab an item in the machine area whereas the motor is still running.
1) The operator tries to grab the item whereas the motor speed is above the first set of SMS speed limits,
an error is triggered and the motor is stopped.
2) The operator reduces the motor speed thanks to the frequency reference
to respect the second set of SMS speed limits before grabbing the item.
No error is triggered; the motor is still running.
3) The motor speed respects the second set of SMS speed limits,
the operator tries to grab an item whereas someone increases the motor frequency reference,
the motor frequency exceeds one of the limits, an error is triggered; the motor is stopped.
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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Press F1 on any given item to open the contextual help
or the product programming manual.
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