Speed Controller SPD-SD300 Installation and Wiring

Rated Voltage   24 Volts
Rated For Motors   Up To 600 Watts
Maximum Current   30 Amps
Conversion Efficiency   95%
Under Voltage Protection   20.5 Volts ± 1.0 Volt
Recommended Fuse Size   40 Amps
Dimensions   4" Long x 2-3/8" Wide x 1-1/4" High
Under Voltage Battery Protection: When the battery pack falls below a specific Voltage the controller turns the motor off preventing over discharging of the battery pack which extends the battery packs lifespan. (The cutoff value is approximately 20.5 Volts ± 1.0 Volt)
Motor Cut-Off During Braking: When the brakes are engaged the brake switch signals the controller to turn off the motor. The brake lever switch is an optional connection and this controller will work without a brake switch connected to it.

*Power Connector
Red = Positive
Black = Negative

Mating Connector Item # CNX-2PX2


Required Connection  
Motor Connector
Blue = Positive
Green = Negative

Mating Connector Item # CNX-50
Required Connection  
Throttle Connector
Mating Connector Item # CNX-52
Mating Throttle Item # THR-35
Required Connection  
Brake Lever Switch Connector
Mating Connector Item # CNX-51
~Optional Connection
Battery Charger Port Connector
Mating Connector Item # CNX-05F
~Optional Connection
*The power connector should be the last connection made.
*Fuse or circuit breaker protection is required between speed controller and battery pack.
~Optional connections do not need to be hooked up for the speed controller to operate. Only newer version scooters used these connections and older version scooters did not use them.