Alpha Technologies FXM 650, 1100, 2000 UPS - Manual (Page 40)

017-230-B4 Rev B 38
Figure 22 — UPS Maintenance: Battery,
Standard charging method
UPS Maintenance > Battery
Setting the Battery Charging Method to Standard or Bulk in the Battery Primary Configuration table
determines which parameters can be set or adjusted. See Figure 22 and Figure 23. The Standard charging
method is the default setting.
Standard Charging Method
Standard Charger Mode
Auto : Charger stops charging when the battery is
fully charged.
Constant : Charger switches to float mode when the
battery becomes charged. Float voltage is 0.4V lower
than maximum charging voltage and is temperature
compensated.
Temperature Compensation
Adjustable from 0 to -6.0 in increments of 0.5.
(Factory default is -5 mV/°C/Cell)
Max Charger Current
Charging current can be set to 0 or any value
between 2A and maximum in increments of 1A
(maximum = 15A for FXM1100/FXM2000 and 10A for
FXM650). Charging current cannot be set to 1A.
When charging current is set to 0A, charger will stop
charging.
Low Battery Warning
Battery voltage value that activates the low battery
warning alarm. For the range of 24V and 48V
settings, refer to the Low Battery Warning entry in
Table I on page 65. The alarm is removed when
battery voltage is 2V above the warning setting for
a 48V battery, or 1V above the warning setting for a
24V battery.
Peukert Number
Refer to Appendix A to calculate the Peukert number.
Capacity
Rated capacity (Ah) of the battery shown on the
battery data sheet. Do not confuse the battery
capacity with the Peukert capacity.
Battery Open Circuit Voltage
Obtain this number from the battery data sheet. The
value is for a single battery, so for a 48V system with
4 batteries connected in series, multiply the number
by 4. For a 24V system with 2 batteries connected in
series, multiply by 2.
Low Voltage Disconnect and Low Voltage Reconnect are available when either standard or bulk charging method
is selected.
Parameter 48V 24V
Default Minimum Maximum Default Minimum Maximum
Low Voltage Disconnect (Vdc) 42 42 45 21 21 23
Low Voltage Reconnect (Vdc) 48 48 51 24 24 26