niu N-GT, Service Manual

Page: 70 / 144

V1.0.0 70
How to read FOC controller indicator flashing frequency (Ref: 001)
• Turn ON the power and count how many times the indicator flashes between each interval.
• If FOC controller is in good working condition, after turning ON the power, the indicator should only
flash once and no more flashing
FOC Controller Flashing Indicator Explanation
Flashing
Frequency
System protection feature Solution
1
Over-Voltage
warning Battery voltage is higher than
default value
2
Under-Voltage
warning Battery voltage is lower than
default value
3
Over-Current
warning
Instant current is higher than
default value or Phase line short
circuit
4
Locked-rotor
warning Duration of Motor in locked-rotor
status longer than default value
Replace FOC controller
5 HALL failure
Incorrect HALL input(Voltage)
detected
Replace Motor
6 MOSFET failure MOSFET power self-check failed Replace FOC controller
7
Phase default
warning one or more of motor phase lines
missing
Replace Motor
9 Brake applied Controller in the braking status
10
Self-checking
failure System on the internal electrical
self-checking found abnormal
11
Controller over-
heat warning Temperature is higher than
default value Stop riding until FOC controller
cool down
14
Cable Hall Sensor
Failure Twist grip/Cable Hall Sensor
Malfunction
15
Alarm in active
state
Alarm activated
17
Communication
failure Communication between ECU
and FOC controller failed
Replace FOC controller