Alpha Technologies VMX Series - Manual (Page 43)

43 017-940-B0-001, Rev. A
If an VMX Power Supply is used in a non-standby application, this variable must be programmed to “0” to
disable the battery maintenance cycle portion of a self-test.
End of Battery Discharge (EOD): The point at which the batteries are fully discharged
(1.75V/C°, 18 cells for 36V inverter; 24 cells for 48V) and the power supply shuts off,
preventing permanent damage to the batteries.
Frequency Range Limit (may be used when powering with AC Generator): AC input voltage
frequency range limit. This limit establishes the acceptable input frequency range outside of
which standby operation is initiated.
Set Defaults: When programmed by the operator to YES, all the programmable data levels
(except DEVICE ADDRESS, Standby Time and Events, and Language) are reset to the
original factory settings.
Self-test: When programmed by the operator to YES, the VMX Power Supply will test
inverter operation.
Standby Events: VMX Power Supply standby events counter. This does not include self-test
events. Use the Setup Menu to reset Standby Events to zero.
5.0 Operation, continued
5.3 Smart Display Glossary
Battery Capacity: The capacity of the battery strings attached to this VMX Power Supply.
When batteries are not attached, the setting may be programmed to “0.” This disables
standby operations, including test mode, and disables the No Batteries Alarm. If batteries are
attached, then this setting should be programmed to the total rating of all battery strings. This
setting can be programmed to higher values to accommodate multiple battery strings (i.e., 1
battery string = 100Ah, 2 battery strings = 200Ah, 3 battery strings = 300Ah).
BULK charge is a “Constant Current” charge. The maximum charger current is 10 Amps.
As the charge is returned to the batteries, their voltage increases to a specifi c threshold
(2.27Vdc per cell). This cycle ends when the charging current into the batteries becomes less
than 0.5A.The charger then switches to ACCEPT mode. The BULK charger mode generally
returns the battery charge state to 80 percent of rated battery capacity.
Charger Accept Voltage: Battery Accept charge voltage control in volts per cell. This
voltage, 2.40Vdc (adjustable) per cell, is temperature compensated to assure longer battery
life. It properly completes the charge cycle and is factory set for Alpha Cell batteries. If other
manufacturer’s batteries are used, consult the battery manufacturer for Accept voltage levels.
Charger Float Voltage: Battery Float charge voltage control in volts per cell. It averages
about 2.27Vdc (adjustable) per cell. It is factory set for Alpha Cell batteries. If other
manufacturer’s batteries are used, consult the battery manufacturer for Float voltage levels.
Charger Temperature Compensation: Battery charger temperature compensation control.
Programming this parameter to “0.0” will disable temperature compensation. It is factory set
for Alpha Cell batteries (5mV/cell/ºC). If other manufacturer’s batteries are used, consult the
battery manufacturer for Charger Temperature compensation ranges.
Device Address: The VMX Power Supply must have a unique address to communicate with
a system controller. The system controller uses the address as an identifi er to query the VMX
Power Supply for information. Each VMX Power Supply on the same communications bus
must be identifi ed with a value between 1 and 7.
NOTE:
The device address will not reset to 1 when factory defaults are reset.
NOTE: