Input/Output - Allen-Bradley DC-UPS Manual

DC-UPS - 24V, 20 A, 480 W Reference Manual

Input/Output

The output is connected to the input through a back-fed protection (MOSFET).
In power supply mode, the output voltage follows the input voltage decreased
by a small voltage loss. In battery mode, the output voltage is a constant
voltage, which can be preselected in one of four voltages.
Input Voltage Range: At voltages within the input voltage range, control
functions such as light-emitting diode (LEDs), monitoring features, relay
contacts, etc. are functioning normally. Within the input voltage range, the
unit can either be in power supply mode or in battery mode.
Normal Operating Voltage Ranges (four ranges): The normal operating
voltage range describes the input voltage, which supports the full functionality
of the DC-UPS (including charging) but without entering the battery mode. It
requires a minimum of 1V higher than the buffer voltage settings and a
maximum voltage of not more than 30V DC.
Buffering and Buffer Voltage: Buffering will start immediately without
interruption after the input voltage falls below the lower end of the normal
operating voltage range. Buffering is possible even if the batteries are not fully
charged. Buffering cannot be started without having previously entered the
normal operating voltage range. The buffer voltage is the output voltage that is
determined by "the buffer voltage setting" and will not change as the batteries
discharge. The buffer voltage is pre-selectable in one of four voltages.
Figure 2 - Definition of "power supply mode" and "Battery mode"
Input
Transfer Threshold
Voltage
t
Output
Voltage
Power Power
Battery
Supply Supply
Mode
Mode Mode
t
Rockwell Automation Publication 1606-RM008A-EN-P - November 2021 9