Quote:
Originally Posted by jpirkola
What I was hoping for was to be able to set the controller to limit itself to use a maximum voltage lower then the pack actual voltage. E.g. the controller can stand a 144 nominal volt battery pack. The controller is set to only pass 120 volts maximum to the motor.
This should allow a bit of headroom in the pack to keep sag under control and allow the controller to maintain maximum kW to the motor without the voltage falling too low. Having repeatable limits helps tuning of the drivetrain
Does the above make sense or am I missing something.
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The controller doesn't have any way of measuring pack voltage or motor voltage, but their are a couple of things you can do. Voltage sag of the pack will be related to the battery amps, which can be limited. Send the command "bat-amps-lim xxx" where xxx is a value between 0 and 511. (zero disables the battery amp limit). At slow motor speeds the motor amps can still reach the 500 amp limit even though the pack amps are limited.
While the motor voltage can't be limited, the controller does have motor overspeed protection built in in software. Since motor speed is a function of motor voltage, adjusting these to suit your setup can give you some protection as well.
Greg