Protection Control
Traction motor inverter, when its status is as shown in the following table, enters a protective control state in order to protect the system. It automatically returns to the normal state when safety is ensured.
| Condition | Control | Normal return condition |
|---|---|---|
| Traction motor is in the state of extremely low revolution and high torque | IGBT switching frequency is reduced.
NOTE:
Traction motor electromagnetic noise increases. |
|
| IGBT is overheated | Traction motor output torque is limited according to the IGBT temperature. | IGBT temperature drops |