Supercapacitor cabinet

The supercapacitor cabinet buffers the high-current pulses required to actuate the keel, so the boat batteries only see a smooth, configurable charging current.

Operation

When the front switch is set to ON, the cabinet starts immediately. It charges the supercapacitor bank up to 31 V while drawing a maximum current configurable in two ways:

• If the cabinet is connected to the KEEL Management central, the limit programmed via the façades (I Chg parameter) is used.
• Otherwise, the limit set by the internal rotary selector is used.

When the charger starts (or when the limit changes), the actual charging current is ramped in steps every 2 seconds until it reaches the target value. The same ramp logic applies on a decrease — for example when communication with the central is lost.

Selector vs façade priority

The façade-programmed limit can be changed at any moment and is applied immediately. The selector value, however, is only re-read after an OFF/ON cycle on the front switch.

Internal current selector

Selector position	Current limit
0	60 A
1	50 A
2	40 A
3	30 A
4	20 A
5	15 A
6	10 A
7	5 A
8	unused
9	unused

Front-panel LEDs

Charger label — STATUS, CAPAS, MAXI / MED / MIN

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The cabinet exposes 5 status LEDs. The same Charger Status and CapaLow LEDs are mirrored on the façades.

Charger Status (blue)

State	Meaning
Solid on	Charger running
Blinking 2 Hz	Charger off

On the façade, the same LED stays solid while the charger is on, then flickers 10 times rapidly at the end of charge before turning off.

CapaLow (orange)

Reports the supercapacitor voltage and acts as a movement-blocking signal:

CapaLow behaviour vs. supercap voltage

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Voltage band	LED state	CapaLow signal
Below 18 V	Blinks at 2 Hz	ON
18 V → 22 V (rising)	Blinks at 2 Hz	ON
Above 22 V	Solid on	OFF
Above 32 V (over voltage)	Blinks at 4 Hz	ON

Movement blocking

While CapaLow is ON, all keel movements are blocked except Release. This protects the hydraulic group motor from running on a depleted bank. The signal is also forced ON if the charger is faulted (high voltage, over temperature, …) but still able to communicate.

Charge-current limit LEDs (MAXI / MED / MIN)

The three rightmost LEDs encode the current limit currently in effect:

I MAX	I MED	I MIN	Current limit
OFF	OFF	BLINK	5 A
OFF	OFF	ON	10 A
OFF	/BLINK	BLINK	15 A
OFF	BLINK	OFF	20 A
OFF	ON	OFF	30 A
/BLINK	BLINK	OFF	40 A
BLINK	OFF	OFF	50 A
ON	OFF	OFF	60 A

Fault behaviour

Fault	LED behaviour
Over voltage	Charge (blue) off, Capa (orange) blinks rapidly
Over temperature	Charge blinks rapidly, Capa blinks rapidly
Switch in OFF	All LEDs off