The number of necessary chopper boards is a question of the multi-axis system setup, not a question of
every particular drive.
For an optimal overall system setup, up to 12 chopper boards can be connected in parallel to the same DC
bus. Their power dissipation capacity will add up.
You can start first test runs with slow trajectories and one chopper board and monitor power that goes to
the chopper board during operation. Decreasing the cycle time will increase this power. In case that either
peak or average power approach the allowable limits, the cycle time should not be reduced further before
adding another chopper module.
In case the chopper system is undersized for the requested load cycle, the SOMANET Chopper 500 either
deactivates itself due to thermal protection or it is just not able to drain the amount of current that it would
need to drain in order to keep the DC bus voltage constant. In either of these two cases, the DC bus voltage
will increase until the SOMANET Drives shut down themselves due to overvoltage.
Attention
An undersized chopper system can lead to dangerous situations when the robot isn’t able to decelerate
as necessary.
1.4.1.7 LED
The board is equipped with three LED indicating the amount of energy being burnt on the Braking Chopper.
The board has three stages and each LED represents one of these stages.
Note
When all LEDs are turned on, it means that another Chopper might be needed. However the DC bus
voltage is still needs to be measured to determine how many choppers are necessary.
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