小牛电动
Niu Electric
- 64 -
Inspection of the input circuit to power supply
Turn the ignition switch and air switch to OFF.
Voltage of the main power cord
Disconnect the following connectors:
- Controller connector
- Red and black input wire connectors to the power supply
Check the DC voltage between the red wire and the negative battery pole or black wire at harness side.
The battery voltage should be available when turning the ignition switch and air switch to ON. It indicates
that the circuit is normal.
Voltage of the 12V power cord
Disconnect the controller connector.
Check the voltage between the red/black wire and the negative battery pole at harness side.
Connection: Red/black (+) - negative battery pole (black) (-)
Standard: 12±0.2V
Check the following items if the measurement value is more than the standard one after turning the
ignition switch and air switch to ON:
- The DC converter failed
- The fuse is broken
- The ignition switch is in a bad contact or has an open circuit.
- The air switch is in a bad contact or has an open circuit.
Hall cable sensor
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