PROTECTIONS

Protection is required for the motors alone in the case of relay binding. No protection is required against motor short circuit to Vbatt and earth because this is provided by the relevant fuse

If the fault persists (relay binding), the NBC does not implement any catch lock/release controls and informs the user of the fault.

If one of the two connections remains connected to Vbatt (relay with blocked contacts), the microprocessor must activate the other relay to restore the connections to the same potential and deactivate the motor current. The active relay coil continues

to use power and can unfortunately drain the battery.