UB40.241
UB-Series
24V,
40A,
DC-UPS
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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5.
I
NPUT AND
O
UTPUT
C
HARACTERISTICS
The input can be powered from a regulated power supply or a similar DC source. Use an appropriately sized power supply, which can
deliver the additionally required internal current consumption of the DC-UPS and the required current for charging the batteries. If a
power supply with a continuous output current greater than 50A is used, a fuse or
circuit breaker with 63A (B- or C-Characteristic) must be connected between the
power supply and the DC-UPS. The continuous voltage between the input and ground
must not exceed 60Vdc. The input must be powered from a PELV or SELV source or an
“Isolated Secondary Circuit” in order to maintain a SELV o
r PELV output. Check for
correct input and battery polarity. The device will not operate when the voltage is
reversed.
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 follows the battery voltage decreased by a small voltage loss.
The output can supply any kind of loads, including inductive loads and capacitive loads. If capacitors with a capacitance larger than 40mF
are connected to the output, the unit might switch off in order to protect itself. If the load inductance is larger than 0.5mH, the unit can
be damaged.
Input voltage
Nom.
DC 24V
±25%
Input voltage range
Nom.
18-30Vdc
Control functions such as LEDs, monitoring features, relay contacts,
etc. are working. The unit can either be in power supply mode or in
battery mode.
Max.
30-35Vdc
Temporarily allowed, no damage to the DC-UPS.
The red error LED will report
“
Input Voltage
”
, charging and buffering
are not possible.
Normal operating input voltage
ranges
Nom.
23-30Vdc
This range describes the input voltage, which supports the full
functionality of the DC-UPS (including charging) but without entering
the battery mode.
Transfer voltage for switching into
battery mode
Typ.
22.2Vdc
Input current
The input current can be calculated by adding the output current and the internal
current consumption. The current for charging the batteries is included in the internal
current consumption.
Internal current consumption
Typ.
Typ.
Max.
Typ.
Max.
Typ.
60mA
3.2A
4.0A
6.2A
7A
2A
When batteries are fully charged
Includes charging current for battery size settings of 12Ah, 26Ah and
38Ah
Includes charging current for battery size settings of 65Ah, 100Ah
and 150Ah
Above 40A input current due to reduced charging current
Output voltage
Nom.
DC 24V
Input to output voltage loss in
power supply mode
Typ.
Typ.
55mV
110mV
At 20A load current
At 40A load current
Battery input to output voltage loss
in battery mode
Typ.
Typ.
110mV
220mV
At 20A load current
At 40A load current
Output current
Nom.
Nom.
Nom.
Nom.
50A
40A
30A
60A
Continuous, below +50°C
Continuous, at +60°C
Continuous, at +70°C
Short term for max. 5s, below +70°C
Derate linearly b50°C and +70°C
Overload behavior in power supply
mode
Typically, the current limitation of the supplying power source limits the
current in an overload condition. There is no overload control included in the
Internal
current
consumption
Current
consumption
for battery
charging
Output
Current
Input
Current
