External Monitoring; Short Circuit; Reverse Polarity; Faulty Battery - Eltek MultiCharger 1500 Description And Operating Instructions

External monitoring

External monitoring
The MC1500 has a number of external monitoring functions that keep a constant check on
connected power consumers. These functions are individually described in the following sub-
sections.

9.1 Short circuit

The MC1500 can detect an output short circuit if this occurs in the current limiter and if the
output voltage falls below the set lower limit (default setting 7V or 14V). In this case, the
MC1500 signals a fault and switches off to the locked position. The message "Short circuit"
appears on the LCD and the red LED flashes.

9.2 Reverse polarity

If a battery is connected with reverse polarity, the MC1500 signals a fault but remains ready for
use. This does not do damage the MC1500. No charging or trickle charging process will be
started. The message "Reverse polarity" appears on the LCD and the red LED flashes.

9.3 Faulty battery

If the battery connected to the charger has an output voltage outside of the permitted limits (see
section 6.7), the MC1500 signals a fault and the charging process does not start. The message
"Faulty battery" appears on the LCD and the red LED flashes.

9.4 Clamp contact

This monitoring function is active in all operating modes (see section 6).
If the MC1500's output current falls below 10mA during the charging or trickle charging process,
the charger unit recognizes that the clamps have been removed from the battery terminals and
it briefly signals a fault. The message "Clamp contact" appears on the LCD and the red LED
flashes but the MC1500 remains ready for use.

9.5 Return voltage

This monitoring function is only active in EPS mode (see section 6.8).
It is not permitted to connect a battery to the MC1500 in this operating mode. If, in spite of that,
a battery is connected prior charging, the charger unit signals a fault. The message "Return
voltage" appears on the LCD and the red LED flashes but the charger unit remains ready for
use.
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