Chapter 2 ___________________________________________________________ Product Overview
VAISALA_________________________________________________________________________ 9
Inside the QBR101 the Solar Panel inputs (X1/5 and 6) are applied
only to the Battery Charger, i.e. they have no straight connection to
the DCout terminals. This is because the 12 V solar panels may
present output voltage levels as high as 28 V, not suitable for all
equipment normally connected to the DCout terminals. The solar
panels can be used only for 12 V (not 24 V) battery systems.
Charger
The charger can be set both for lead-acid or nickel-cadmium batteries,
and for 12 V or 24 V battery systems by using the external voltage
selection. The External Voltage Selection Resistor is connected
between the terminals X3/5 and X3/6 (Vset and GND). The
correspondence between the External Voltage Selection Resistor
values and charge voltage is described in section Charge Voltage
Adjustment on page 16.
The External Temperature Sensing Resistor (NTC) controls the
maximum charging voltage. The NTC resistor is connected between
the terminals X3/4 and X3/5 (Vcomp and Vset). For details, see
section Temperature Compensation NTC on page 17.
The batteries are charged with a constant-current / constant-voltage
method. The maximum charging current can be set with jumpers J1 -
J3 within the range of 0.5 to 2.5 A in steps of 0.5 A. For the jumper
settings, see section Jumpers for Charge Current Limit on page 13.
The Charge LED is lit, while the battery charging current is above
200 mA (approximately).
Control Circuit
The control circuit monitors the battery voltage level. When the
voltage level is suitable for normal operation, the 3-color Battery
Status LED is lit green and DCout/Switch output (X2/5) is being
switched ON, hence providing current to the load. If the voltage level
drops below the Low Battery Alarm limit (11.5 V with 12 V batteries
or 23.0 V with 24 V ones), the Battery Status LED will change color
to orange and the state of the Low Battery Alarm output (X3/3) goes
low (0 V). In case the voltage further drops below the Deep Discharge
limit (10.0 V or 20.0 V), the Battery Status LED changes to red and
the DCout/Switch output (X2/5) is switched OFF, hence
disconnecting the load in order to stop discharging the battery. When
the battery voltage resumes back to normal (above 12.3 V or 24.5 V),
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