Orion-Tr Smart DC-DC Charger Non-Isolated 5. Automatic engine shutdown detection The automatic engine shutdown detection simplifies the system by detecting whether the engine is running, without wiring additional switches or sensors. The factory default setting will work with most conventional and smart alternators but can be re-configured with the VictronConnect App. The detection is based on the alternator voltage. Conventional alternators will generate a fixed voltage (e.g. 14V), whereas the voltage of smart alternators can vary between 12.5V to 15V (for a 12V system). Smart alternators in a regenerative braking system often show large voltage variations.
Engine shutdown detection is only active in charger mode. The feature can be configured, disabled and reactivated as described in the Engine shutdown detection setup with VictronConnect [11] section. In power supply mode, the Input voltage lock-out determines when the output is active. In installations where the alternator voltage does not give the detection enough to work with, an external engine running signal can be used instead; see the Using an external engine running signal [13] section. The engine shutdown detection is updated from software version v1.05 onwards. 5.1. How it works The following procedure describes the operation of the engine shutdown detection sequence. Figure 8:
Engine shutdown detection sequence 1. 0 → 1: If the engine runs, the alternator voltage will ramp up. When V starter > V start , charging is enabled. 2. 1 → 2: The input current produces a voltage across the input cable (V cable ); this voltage reduces the voltage measured by the charger (V IN ). If V IN > V shutdown , the charger will operate at I max . 3. 2 → 3: If V IN ≤ V shutdown , the charge current will be reduced to prevent V IN to drop below V shutdown . 4. 3 → 4: If V IN shutdown for longer than 1min (t shutdown ), “engine off” is detected and charging is disabled. If V IN > V shutdown before t shutdown runs out, charging remains enabled. Page 10 Automatic engine shutdown detection