017-220-J0 Rev C
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9.4 Battery Charging Options
The batteries for the Alpha Micro 100 are located internal to the unit. The default charging algorithm has been de-
signed for optimum performance of the UPS and the batteries. Unless absolutely required it is recommended not to
modify or adjust the charging method or other battery parameters.
This procedure may be performed using the Web Interface.
CAUTION!
Any changes and adjustments to the charge algorithm must be made only by qualified
personnel, who understand the different charging modes and their suitability to the bat-
tery chemistry.
9.4.1 Standard Charging Method
Standard Charger Mode
In this mode the UPS charges the battery with a constant target voltage and limiting the maximum charge current.
However when the battery reaches the target voltage and the charge current drops to a small value, the charger can
be set to two options:
Auto
: When BATT FLOAT is set to AUTO, the float voltage is set to 0.9V below the max charge voltage. The default
max charge voltage is 27.3V and default float is 26.4V, both at 25°C.
Constant (default from factory)
: When BATT FLOAT is set to Constant, the default max charge voltage is 27.3V
and float is 27.1V, both at 25°C. Temperature compensation will be active.
9.4.2 Bulk Charging
The bulk charging method allows a voltage range for the maximum charge voltage to be set by the user. It also
allows a voltage range for the float voltage to be set by the user, up to the maximum of the bulk voltage setting. Tem-
perature compensation will be set to 0 mV/°C / cell as default. The user can choose to modify this with the available
settings.
In both methods of charging the user can set the maximum charge current.
The following table includes the three parameters which are only available when the bulk battery charging method is
selected:
Table J — UPS Operating Modes - 24V
Parameter
Default
Minimum
Maximum
Max Charger Voltage (Vdc)
26.8
26
28
Float Charger Voltage (Vdc)
26.8
26
28
Low Voltage Warning* (Vdc)
22
22
23
*Low voltage warning value has to be higher than
Low Voltage Disconnect
and lower than
Low Voltage
Reconnect
.
Figure 13 — Bulk Charging Parameters
The following screen images provide a view of the navigation through the various screens of the Web Interface. The
default password is 1111.
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