Baserunner Controller User Manual
Rev 1.0
The “Low Voltage Cutoff (Start)” and “Low Voltage Cutoff (End)” values can be
set just above the BMS cutoff point of your battery. If you are using a V3 Cycle
Analyst, we recommend leaving these values at the default 19.5/19.0 volts and
use the CA3’s low voltage cutoff feature instead. That way you can change the
cutoff voltage on the fly.
If you are setting up a system with regenerative braking and have a BMS circuit
that shuts off if it detects excessive charge current, then you may also need to
limit the “Maximum Regen Battery Current” that will flow into your pack.
5.4 Motor Phase Current and Power Settings
Basic Setup tab
In addition to regulating the current flowing in and out of the battery pack, the
Baserunner
can independently control the maximum phase currents that flow to
and from the motor. It is the motor phase current that both generates torque and
causes the motor windings to heat up. At low motor speeds this phase current
can be several times higher than the battery current you see on a
Cycle Analyst
.
The “Max Power Limit” sets an upper limit on the total watts that will be allowed
to flow into the hub motor. This value has a similar effect to a battery current limit,
but it is dependent on voltage. A value of 2000 Watts will limit battery current to
27 amps with a 72V pack, while allowing over 40 amps with a 48V pack.
“Max Phase Current” determines the peak amps, and hence torque, put through
the motor while accelerating at full throttle assuming no other limits are reached.
The “Max Regen Phase Current” value directly sets the peak braking torque of
the motor at full regen. If you want a strong braking effect, then set this to the full
55 or 80 amps. If the maximum braking force is too intense, then reduce its
value.
The following graph illustrates the interplay between motor phase current, battery
current, and motor output power for a typical setup. When riding at full throttle,
low speeds will be phase current limited, medium speeds will be battery current
limited, and high speeds will be limited by the voltage of your battery pack.
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