Reference Manual Owner manual

All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time unless noted otherwise.
It is assumed that the input power source can deliver a sufficient output current.
6 Rockwell Automation Publication 1606-RM017A-EN-P — February 2014
Bulletin 1606 Switched Mode Power Supplies
7. Output in Buer Mode
If the input voltage falls below the transfer threshold level, the DC-UPS starts buering without any interruption or
voltage dips. The transfer threshold level is typically 80mV higher than the 24V output voltage in buer mode.
Buering is possible even if the battery is not fully charged.
24V Output
Output voltage
nom. DC 24V Output is stabilized and independent from battery voltage.
22.45V ±1%, at no load,
22.25V ±1%, at 10A output current
Ripple and noise voltage max. 20mVpp 20Hz to 20MHz, 50Ohm
Output current nom. 0 - 10A Continuously allowed, 12V output not loaded.
10 - 15A *) 12V output not loaded.
min. 7.0A If 12V output is loaded with 5A.
Short-circuit current min. 17.9A Load impedance 100mOhm **); the 12V output is o during an
overload or short on the 24V.
max. 21A
12V Output
Output voltage
nom. DC 12V Output is stabilized and independent from battery voltage.
Output voltage tolerance ±2%
Ripple and noise voltage typ. 30mVpp 20Hz to 20MHz, 50Ohm ;
nom. 0 - 5A Continuously allowed, may be lower if the 24V output is loaded
more than 7.0A
Output current
Short-circuit current min. 4A Load impedance 100mOhm, see Fig. 7-5 for typical values.
Continuous constant; the 24V output is on during an overload
or short on the 12V as long as the battery delivers current.
max. 5.5A
*) If the output current is in the range between 10A and 15A (Bonus Power) for longer than 5s, a hardware-controlled
reduction of the maximal output current to 10A occurs. If the 10A are not sucient to maintain the 24V, buering stops at
both outputs after another 5s. Buering is possible again as soon as the input voltage recovers.
**) If the nominal output voltage cannot be maintained in buer mode, the DC-UPS switches o after 5s to save battery
capacity.
Fig. 7-1 Buering transition, denition Fig. 7-2 Transfer behavior, typ.
Buer mode
Output
voltage
24V
28V
Input
voltage
t
t
Transfer
threshold
5
0
0
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s
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2
4
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2
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2
5
V
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0
A
2
4
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