Mean Well DBUF20-24 Installation Manual

 Type：
DBUF DIN rail Buffer Module
DBUF20-24
DBUF40-24
 Introduction
The DBUF buffer module is a supplementary device for regulated DC 24V power supplies. The buffer module utilizes
maintenance-free electrolytic capacitors to store energy, thus eliminates the need of periodic replacement as
compared to costlier batteries which also have shorter functional life span. The DBUF comes with comprehensive
protection features like over voltage, over current and short circuit protections. Buffer modules can be connected in
parallel to increase the output ampacity or the hold-up
Like other Mean Well's DIN series, they can be mounted on a TS35 Standard DIN rail.
 Installation
（1）Always allow good ventilation clearances, 5mm left and right, 40mm above and 20mm below, around the unit
in use to prevent it from overheating.
（2）The appropriate mounting orientation for the unit is vertical, the TB1 terminals at the bottom. Mounting
orientations other than that, such as upside down, horizontal, or table-top mounting, is not allowed.
（3）Use copper wire only, and recommended wires are shown as below.
AWG
Rated Current of
Equipment (Amp)
Cross-section of
2
Lead(mm
Note: 1. Current each wire carries should be de-rated to 80% of the current suggested
above when using 5 or more wires connected to the unit.
2. The maximum allowable wire cross-sectional area for the terminal is 10 AWG/
Make sure that all strands of each stranded wire enter the terminal connection and the screw terminals are
securely fixed to prevent poor contact. If the power supply possesses multi-output terminals, please make sure
each contact is connected to wires to prevent too much current stress on a single contact.
（4）Use wires that can withstand temperatures of at least 80°C, such as UL1007.
（5）Recommended wire strapping length is 5mm (0.197").
（6）Recommended screwdriver is 4mm, slotted type.
（7）The recommended torque setting for terminals is 10kgf-cm(9Lb-in).
（8）Mounting Instruction:
Mount as shown in figure only, with input terminals down, or else sufficient cooling will not be possible.
Admissible DIN rail：TS35/7.5 or TS35/15
For rail fastening：
Installation Manual
Charging Voltage: 23-30VDC
Charging Voltage: 23-30VDC
18
7A
0.8
)
2
5.3 mm .
OUTPUT: 20A (max)
OUTPUT: 40A (max)
time.
16 14
10A 15A
1.3 2.1
12 10
20A 30A
3.3 5.3