Jun. 2020 / Rev.0.1 DS-UB40.241-EN All values are typical figures specified at 24Vdc input voltage, 40A output current in
power supply mode at 25°C ambient, no charging and after a 5 minutes run-in time unless otherwise noted.
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DC-UPS Abbreviation for Uninterruptible Power Supply system with a DC input and a DC output.
A DC-UPS utilizes batteries as back-up energy source.
T.b.d. To be defined, value or description will follow later.
DC 24V A figure displayed with the AC or DC before the value represents a nominal voltage with standard
tolerances included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V).
24Vdc A figure with the unit (Vdc) at the end is a momentary figure without any additional tolerances included.
may A key word indicate flexibility of choice with no implied preference.
shall A key word indicate a mandatory requirement.
should A key word indicate flexibility of choice with a strongly preferred implementation.
Normal mode See “Power supply mode”
Buffer mode See “Battery mode”
Inhibit mode Describes a condition where buffering is disabled on purpose (e.g. for service actions).
Power supply mode Describes a condition where the input voltage is in the rated input voltage range and the supplying power
supply can deliver a sufficient amount of current for
the DC-UPS and the load. Additionally, it is assumed
that the output is loaded within the allowed limits
and the battery is charged, if necessary.
The mode can also be called “Normal mode”.
Battery mode Describes a condition where the input voltage is
below the transfer threshold level, the unit is running
on batteries (buffering) and the output is loaded
within the allowed limits.
The mode can also be called “Buffer mode”.
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