BIT0: SPA output control
BIT1: RELAY2 output control
BIT2 RELAY1 output control
BIT3: Manufacturer reserves the undefined
BIT4: SPB switching quantity output control
0000: No fault
0001: Inverter unit protection
0002: Acceleration overcurrent
0003: Deceleration overcurrent
0004: Constant speed overcurrent
0005: Acceleration overvoltage
0006: Deceleration overvoltage
0007: Constant speed overvoltage
0008: Control power failure
0009: Undervoltage fault
000A: Inverter overload
000B: Motor Overload
000C: Input phase loss
000D: Output phase loss
000E: Module overheating
000F: External fault
0010: Communication abnormal
0011: Contactor abnormal
0012: Current detection fault
0013: Motor parameter auto tunning fault
0014:Encoder/PG card abnormal
0015: Parameter read and write abnormal
0016: Inverter hardware fault
0017: Motor short to ground fault
0018: Reserved
0019: Reserved
001A:Running time arrival
001B: Custom fault 1
001C: Custom fault 2
001D: Power-on time arrival
001E: Load drop