Operation
26
6 OPERATION
The DSE battery charger can be used as a battery charger, DC power supply, or both at the same
time. For instance, the unit can be used to power the generator control panels and charge the panel
batteries or starter batteries at the same time.
With no AC input to the charger, the Charge fail relay is de-energised. This can be used to provide
indication of charger failure which operates upon mains supply AC supply failure or battery charging
failure.
When a suitable AC supply is connected, operation of the unit will depend upon the load connected to
the unit’s output terminals :
Battery connected – The charging operation will begin (Charge mode)
No Battery connected – The output voltage will be enabled. (PSU mode)
Reverse connected battery – The charger will remain in charge fail mode.
Short circuit – The charger will remain in charge fail mode.
AC under/over voltage – The charger will remain in charge fail mode.
DC over current/voltage – The charger will remain in charge fail mode.
Over temperature - The charger will remain in charge fail mode.
Battery Charger Failure - The charger will remain in charge fail mode.
Depending upon the model variant, the battery charger can be operated using either the remote or
enclosure mounted DSE2541.
Operation of the LCD display module is covered later in this section.
6.1 OPERATING MODES
6.1.1 PSU MODE
If no battery is connected to the output terminals, the DSE battery charger will operate as a DC power
supply only, current limit is factory set. See the section entitled Specification elsewhere in this manual
for output specifications.
6.1.2 CHARGE MODE
NOTE: Ensure any Standing Load (loads connected to the battery charger other than the
battery) are less 75% of the battery charger configured rating. This helps to ensure the charger
correctly detects the battery charge state.
Constant Voltage
The DSE battery charger operates in Constant voltage current limited mode.
The charger output voltage is maintained at a constant level to allow the battery to charge while the
load does not exceed the maximum rating of the charger.
Once the battery is fully charged, the battery charger switches to ECO-POWER mode. This is a low
power use standby mode.
Current Limit
If the load on the battery charger (battery charge demand+standing load) exceeds the maximum
current rating of the charger, the charging current is limited to the maximum rating of the charger and
the voltage is reduced.
The voltage will rise to the rated voltage again once the load drops below the maximum rating of the
charger.
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