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NAP-2 Power Supply Unit
Battery supervision unit for BN systems, with protection against overvoltage and deep discharge.
The NAP-2 supply unit supervises battery banks in BN power-supply systems. The protection circuit monitors battery-group voltage, prevents discharge below the safety threshold, trips the contactor at the battery connection and enables recharging after the 230 V AC supply returns.
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Battery-block supervision
Monitors battery-block voltage and signals charging health and low battery voltage.
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Battery contactor trip
At the U<< safety threshold it disconnects the battery from the loads and prevents deep discharge.
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AC loss signalling
Relay K2 signals loss of 230 V AC battery-charging supply or charger fault.
- Voltage
- 2 x 24 V DC ±25%
- U< pickup threshold
- 22 V ±0.5 V per battery block
- U<< pickup threshold
- 21 V ±0.2 V per battery block
- Hysteresis
- 1.05
- Voltage
- 48 V DC ±25%
- Maximum output current
- 1 A
- AC voltage loss
- NO contact 125 V DC, 1 A
- LED signalling
- green LED for charging and healthy voltage; yellow LED for low battery voltage U<
- Temperature range
- -20 to +50 °C
Input
Undervoltage protection
Contactor output
Signalling
General
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