TDK-Lambda DBM20 User manual

Page 1 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
D
BM
20
I
nstruction
M
anual
BEFORE USING THE PRODUCT
Be sure to read this instruction manual thoroughly before using this product. Pay attention to all cautions and warnings before using this product. Incorrect usage
may lead to an electrical shock, damage to the unit or a fire hazard.
DANGER
Never use this product in locations where flammable gas or ignitable substances are present.
DANGER
Ne jamais utiliser ce produit en présence de substances inflammables ou explosives.
INSTALLATION WARNING
 When installing, ensure that work is done in accordance with the instruction manual. When installation is improper, there is risk of electric shock and fire.
 Installation shall be done by service personnel with necessary and appropriate technical training and experience. There is a risk of electric shock and fire.
 Do not cover the product with cloth paper or etc. Do not place anything flammable around. This might cause damage, electric shock or fire.
WARNING ON USE
 Do not touch this product or its internal components while circuit in operation, or shortly after shutdown. You may receive a burn.
 While this product is operating, keep your hands and face away from it as you may be injured by an unexpected situation.
 There are cases where high residual voltage remains inside the product. Therefore, do not touch even if they are not in operation as you may get injured due to
high voltage and high temperature. You may also get electric shock or burn.
 Do not make unauthorized changes to this product nor remove the cover as you may get an electric shock or may damage the product. We will not be held
responsible after the product has been modified, changed or disassembled.
 Do not use this product under unusual condition such as emission of smoke or abnormal smell and sound etc. Please stop using it immediately and turn off the
product. It may lead to fire and electric shock. In such cases, please contact us. Do not attempt to repair, as it is dangerous for the user.
 Do not operate and store these products in environments where condensation occurs due to moisture and humidity. It may lead to fire or electric shock.
 Do not drop or apply shock to this product. It may cause failure. Do not operate these products when mechanical stress is applied.
PRECAUTIONS D’USAGE
 Ne pas toucher ce produit ou l’un de ses composants internes pendant qu’il est sous tension, ou peu après la mise hors tension. Vous pourriez vous brûler.
 Ne pas modifier ce produit sans autorisation ni retirer son capot, vous pourriez recevoir une décharge électrique
ou endommager le produit. Nous ne saurions être tenus responsables après que le produit ait été modifié, changé
ou démonté.
 Ne pas utiliser ce produit dans des conditions anormales comme la présence de fumées ou d’odeurs inhabituelles ou de bruits suspects etc. Merci d’arrêter
l’utilisation immédiatement et d’éteindre le produit. Il pourrait se produire un feu ou un choc électrique. Dans de tels cas, merci de nous contacter. Ne pas
essayer de réparer le produit, c’est dangereux pour l’utilisateur.
 Ne pas utilizer oustocker le produit dans un environnement exposé à la condensation ou à l’humidité Cela peut provoquer un feu ou un choc électrique.
CAUTION ON MOUNTING
 Follow connections to input/output terminals indicated in the instruction manual before switching on.
 Input/output wires are to be short and thick as possible.
 Do not use this product in special environment with strong electromagnetic field, corrosive gas or conductive substances and direct sunlight, or places where
product is exposed to water or rain.
 Mount this product properly in accordance with the instruction manual, mounting direction and shall be properly ventilated.
 Please turn off the input power when doing wiring to connect to the input/output of the product.
 When installing in environment where conductive foreign, dust and liquid may be present, please consider penetration and take actions to prevent the above
foreign material from entering the buffer module by installing filter. In order to prevent trouble or malfunction.
CAUTION ON USE
 Product individual notes are shown in the instruction manual. If there is any difference with common notes, individual notes shall have priority.
 Before using this product, be sure to read the catalog and instruction manual. There is risk of electric shock or damage to the product or fire due to improper
use.
 Input voltage, Buffer current, Buffer power, ambient temperature and ambient humidity should be kept within specifications, otherwise the product will be
damaged, or cause electric shock or fire.
 If the built-in fuse is blown, do not use the product even after replacing the fuse, as there is risk of abnormality inside. Kindly request repair to our company.
 This product with built-in protection circuit, depending on usage conditions, built-in protection circuit may not work. It is recommended to provide a separate
protection circuit (element, fuse, etc.), insert fuse at the input to prevent smoke, fire during abnormal operation.
 This product is made for general purpose electronic equipment use and is not designed for applications requiring high safety (such as extremely high reliability
and safety requirements. Even though high reliability and safety are not required, this product should not be used directly for applications that have serious risk
for life and physical safety). Take sufficient consideration in fail-safe design (such as providing protective circuit or protective device inside the system).
 When used in environments with strong electromagnetic field, there is possibility of product malfunction.

Page 2 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
CAUTION ON USE
 When used in environment with corrosive gas (hydrogen sulfide, sulfur dioxide, etc.) , there is possibility that they might penetrate the product and lead to
failure.
 When used in environments where there is conductive foreign matter or dust, there is possibility of product failure or malfunction.
 Provide countermeasure for prevention of lightning surge voltage as there is a risk of damage due to abnormal voltage.
 Connect together the frame ground terminal of the product and the ground terminal of the equipment for safety and noise reduction. If these ground is not
connected together, there is a risk of electric shock.
 Take care not to apply external abnormal voltage to the input/output. Especially, applying reverse voltage or overvoltage more than the rated voltage to the
input/output as it may cause failure, electric shock or fire.
 Depending on product failure mode, there is possibility of hazardous voltage occurance at the input/output terminal. Therefore, the input/output of this
product must be protected in the end use equipment to maintain ES1.
 This product contains a printed circuit board utilizing surface mounted devices. PCB stress such as bending, twisting, etc., could cause damage. Please handle
with care.
NOTE
 When disposing product, follow disposal laws of each municipality.
 Published EMI (RE) or immunity is the result when measured in our standard measurement conditions and may not satisfy specification when mounted and
wired inside end-user equipment.Use the product after sufficient evaluation is done at the actual end-user equipment.
 When exporting our products, apply the necessary permissions as required by rules and regulations of Foreign Exchange and Foreign Trade Control Act.
 Catalogue or contents of the instruction manual may be changed without a prior notice. Refer to latest catalogue or instruction manual.
 Reproduction or reprinting the instruction manual or its portion is not allowed without our permission.
PRECAUTIONS DE MONTAGE ET D’UTILISATION
 Respecter les connexions des borniers d’entrée/sortie décrites dans le manuel utilisateur avant de mettre sous tension.
 Ne pas utiliser ce produit dans un environnement exposé à un fort champ émectromagnétique, à des substances corrosives ou conductrices,
à la lumière directe du soleil ou à la pluie et l’humidité.
 En cas d’installation dans un environnement où des particules conductrices, de la poussière ou des liquides peuvent être présents,
merci d’installer des filtres afin de prévenir toute intrusion de corps étrangers à l’intérieur du produit et d’éviter pannes et dysfonctionnements.
 Ce produit est destiné aux équipements électroniques à usage general et il n’est pas conçu pour des applications à hauts risques (telles que les applications de
sécurité ou de grande fiabilité. Même si une grande fiabilité ou une grande sécurité ne sont pas requises, ce produit ne doit pas être utilisé directement dans
des applications présentant des risques sérieux pour la vie ou l’intégrité physique). Le principe de défaillance sécuritaire doit être appliqué à la conception
(tels que l’installation de circuits ou de composants de protection).
 Connecter la masse du châssis et la borne de terre de l’équipenet pour la sécurité et la réduction de bruit. Si cette connexion n’est pas faite, il existe un risque
de choc électrique.
 En fonction du type de défaillance, il eixte un possibilité de pr »sence d’une tension dangereuse sur les bornes de sortie. Ainsi, la sortie de ce produit doit être
protégée dans l’équipement final pour conserver la TBTS.
LONG-TERM STORAGE METHOD AND LONG-TERM STORAGE PERIOD
 Please keep the product in carton box.
 Please do not apply excessive vibration, shock or mechanical stress applied directly to the product.
 Please keep away from direct sunlight.
 Temperature and humidity should be within range of product specification (with no condensation)
 For long-term storage temperature and humidity, the following conditions shall be used as a guideline :
Temperature range : 5℃～30℃
Humidity range : 40%～60%RH
Please keep away from the places where temperature and humidity can change drastically
It can cause condensation on the product or deterioration.
 For long-term storage period, we recommened to use within 2 years after receiving the product.
There is tendency that the leakage current of the aluminium electrolytic capacitors may increase over time when stored without using for long time.
This phenomenon can be improved by applying voltage to the aluminium electrolytic capacitors in order to reduce the increased of leakage current through
the self-recovery effect of the electrolyte.
For reference, before using products that have been stored for a long time, please warm-up first for 30 minutes or more without taking load.
< Criterion for warm up voltage condition>
(1) Implementation period : 1 year or above after product delivery
(2) Electrical continuity condition
Input voltage : Rating
Load : 0A
Ambient temperature : Normal temperature
Time : 30 minutes or more

Page 3 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
CE MARKING / UKCA MARKING
CE Marking, when applied to a product or packing material for a product covered by this handbook, indicates compliance with
the Low Voltage Directive, EMC Directive and RoHS Directive.
UKCA Marking, when applied to a product or packing material for a product covered by this handbook, indicates compliance
with the Electrical Equipment (Safety) Regulations, Electromagnetic Compatibility Regulations and Restriction of the Use of
Certain Hazardous Substances in Electrical & Electronic Equipment Regulations.
1. Model Name Identification Method
DBM 20/
2. Terminal Explanation
+V: +Input/Output terminal
- V: - Input/Output terminal
: Earth Terminal
RED LED: Discharging Indicator. LED will be ON
during Buffering mode.
GREEN LED: Charged Indicator. LED will be ON
during Ready mode.
DC OK: Relay (Photo Mosfet). Logic low when input voltage
is within specification.
Buffer Level: Switch up for Fixed mode and switch down
for VIN-1 mode.
TD
Level
DBM20
FIXEDMODE
CHARGING
DISCHARGING
Buffer
VIN‐1
+ : Common supply 3.3 - 30V(max)
Buffer: signal will turn “high” during discharging mode.
Ready: signal will turn “high” after bulk electrolytic
capacitors are charged up.
Inhibit: pull to TTL “low” to activate the inhibit mode.
DISCHARGING
CHARGING
24VDC/20A
+V
DBM20
1
+V ‐V ‐V
234
4+
3Buffer
2Ready
1Inhibit
FIXEDMODE
VIN‐1
Buffer
Level
Figure 1
1 2 3
4
5
7
11
6
10 9 8
Option (*1)
Output Current
Model Name
1
2
3
10
4
5
6
7
8
9
11
(*1)Type of input and output connector:
Blank : Standard type
/E : Spring type
/CO : With coating on solder side
/CO2 : With coating on both sides

Page 4 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
3. Terminal Connecting Method
Pay attention to the input/output wiring. If it is connected to
wrong terminal, the buffer module will be damaged.
 When connecting input and output wiring, input
voltage should be off
 The terminal must be connected to the
protective earth terminal or chassis of the equipment.
 When connecting or removing input and output wires,
do not apply stress to unit.
 Power supply should be fixed directly to the input
connector of the buffer module. Please refer to wiring
diagram shown in 3.1 below.
 According to EN/UL62368-1 multi-strand flexible
cables connected to the input require ferrule.
3.1 Wiring for power supply and buffer
module.
(1) General input/output wiring
(2) Parallel of buffer units
(3) Signal wiring with internal voltage supply
(4) Signals wiring with external voltage supply
DBM20
1Inhibit 4321
4+
3Buffer
2Ready
TD
Level
Buffer
VIN‐1
FIXEDMODE
CHARGING
DISCHARGING
+V
24VDC/20A
+V ‐V‐V
4. Explanation of Functions and Precautions
4-1. Input Voltage Range
4-1.1 Fixed mode: input voltage range is 23 – 30VDC.
4-1.2 VIN-1 mode: input voltage range is 24 – 30VDC
Input voltage which is out of specification or reversed,
may damage the unit.
4-2. Nominal Buffer Voltage Range
4-2.1 Fixed mode: during buffering mode the nominal
buffer voltage level : 22.4VDC.
4-2.2 VIN-1 mode: during buffering mode the
nominal buffer voltage range : 22 - 29.4 VDC (at
20A).
Caution on use :
Kindly take note that the buffer voltage is equal to the
input voltage during Ready mode.
4-3. Signal Output
4-3.1 Relay signal is present at the DC OK terminals as
indication of the status of input voltage at the input
terminal.
In normal operation relay DC OK is close if it is greater,
or open if it is lower then the threshold voltage : 18.8 ±
0.5V.
DC OK relay rating : 30V(max) / 200mA(max).
N
L
+
Buffer
Ready
Inhibit
DISCHARGING
CHARGING
24VDC/20A
+V
DBM20
1
+V ‐V ‐V
234
4+
3Buffer
2Ready
1Inhibit
DRF480‐24‐1
24VDC/20 A
+V +V ‐V ‐V DC OK
DCOK
V.ADJ
PEAK
100‐240VAC
NL
TDTD
FIXEDMODE
VIN‐1
Buffer
Level
Figure 4
Figure 5
DISCHARGING
CHARGING
24VDC/20A
+V
DBM20
1
+V ‐V ‐V
234
4+
3Buffe r
2Ready
1Inhibit
TD
FIXEDMODE
VIN‐1
Buffer
Level
DC OK
Figure 2
Figure 3
N
L
+
Buffer
Ready
Inhibit
DISCHARGING
CHARGING
24VDC/20A
+V
DBM20
1
+V ‐V ‐V
234
4+
3Buffer
2Ready
1Inhibit
DISCHARGING
CHARGING
24VDC/20A
+V
DBM20
1
+V ‐V ‐V
234
4+
3Buffer
2Ready
1Inhibit
DRF480‐24‐1
24VDC/20A
+V +V ‐V ‐V DC OK
DCOK
V.ADJ
PEAK
100‐240VAC
NL
TDTDTD
FIXEDMODE
VIN‐1
Buffer
Level
FIXEDMODE
VIN‐1
Buffer
Level

Page 5 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
4-3.2 Ready and buffer signals as indicator of the
operation status of the buffer module. Ready signal will
change to logic high when the bulk electrolytic capacitors
charged up to more than 220Vdc typical after starts up,
and the green LED lights up. The RED LED will only
light up during buffering mode and at the same time the
buffer signal change to logic high. RED LED will be off
when the bulk electrolytic capacitors discharged to less
than 50Vdc typical.
Ready and buffer signals with 10mA max. are common
supply type with voltage range 3.3 - 30V.
Caution on use :
a) Kindly take note that both signals may be mistriggered
during brown out conditions.
b) In Ready mode, buffer signal may appear if dynamic
load occurred.
4-3.3 Inhibit signal with 10mA max. is common
supply type with voltage range 3.3 - 30V.
Inhibit function can be activated by simply pulling the
inhibit signal line to logic low. The buffer unit will
immediate stop the existing charging/buffering
operation and start to discharge the energy stored in the
bulk electrolytic capacitors to the safe level in about 3 ~
5 seconds.
Caution on use :
Please do not touch the buffer module immediately after
the inhibit function because of high voltage might still
present across the bulk electrolytic capacitors.
Please refer to figure 6 for general connection diagram
for signals.
For example :
Common supply R1 = R2 R3
12V±10% 1500Ω ±5%
(1W)
150Ω ±5%
(3W)
4-4. Fixed Mode and Vin-1 Mode
Buffer module provides two option for buffer voltage
that is fixed mode and Vin-1 mode. Executed using
toggle switch to choose between the two options. (refer
to Figure 1).
At fixed mode the buffer voltage is set at 22.4V. While
in Vin-1 mode, the buffer voltage is typically 1V lower
than the regulated output voltage of the power supply
source. Vin-1 mode is suitable for adjustable output
upstream power supply, this is to keep buffer voltage as
close as possible to the regulated output voltage of the
power supply
4.5. Input Over Voltage Protection ( OVP )
Input OVP circuit will shut down the boost converter if
the input to the buffer module is greater than 30V. If the
input voltage drops back to the normal operating range
of 23 - 30V, the buffer module will operate as per normal
again.
4-6. Over Current Protection ( OCP )
The OCP function is provided for the buffer voltage. When
the buffering current exceeds 105% of the maximum DC
buffer current specification, OCP operation will be
activated. The buffering current will be automatically
recovered when overload condition is removed.
4-7. Parallel Operation
The buffer module can be connected in parallel to increase
the buffer time. Please refer to wiring diagram shown in
3-1 (2) for parallel connection. The total output current
and charge current must not exceed the maximum output
current of the upstream power supply. The voltage may
drop due to the overcurrent protection of the upstream
power supply.
4-8. Series Operation
Not possible.
4-9. Buffer Module Operation
The product can be used to :
a) To extend the hold up time after AC loss.
Buffer Module
AC
DC
GND
buffer time
b) To bridge the mains failure
Buffer Module
AC
DC
GND
buffer time
Figure 6

Page 6 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
4-10. The Buffer Current versus Buffer Time for
Fixed Mode and Nominal buffer Voltage.
Buffering time 0 – 2 seconds
NOTE : Ta=25⁰C and initial capacitance
Kindly refer to product specifications for more details
regarding hold up time.
4-11. Buffer Ripple and Noise
The standard specification for maximum ripple value is
measured according to measurement circuit shows in
figure 7. When load lines are longer, ripple becomes
larger. In this case, electrolytic capacitor, film capacitor,
etc might be necessary across the load terminal.
4-12. The Timing Sequence Chart
Figure 7
(1) The buffer module is connected to the upstream power supply. After AC input to the power supply, the output
from the power supply which is connected to the input/output of the buffer module will charge up the internal
circuit of the buffer module.
(2) Once the input/output voltage reaches the threshold voltage of DC OK circuit, the DC OK signal will change
from logic high to logic low.
(3) After approximately 40s, the bulk electrolytic capacitors voltage will be charged up to 220Vdc typical and the
Ready signal change from logic low to logic high.
(4) If the AC input shutdown or brown out conditions, the output voltage from the upstream power supply will go
down. In this case, the input/output voltage of the buffer module will go down as well. The buffer module
senses this change and it will activate buffer mode. Please refer to section 4-2. for the nominal buffer voltage
level that the buffer module to supply back to the output line of the upstream power supply.

Page 7 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
4-13. The Block Diagram
AC MAINS
INPUT/OUTPUT
voltage
Bulk capacitor
voltage
Ready Signal
Buffer Signal
Charging
. Mode
Ready
Mode
Buffering
220V
Hold-up Time Power Supply
Buffer Time
Inhibit Signal
DC OK
Ready
Mode
Ready
Mode
Buffering
Inhibit
(5) While buffering take place, buffer signal will change from logic low to high. And Ready signal will change from
logic high to low.
(6) During the upstream power supply is still turn ON case and customer system will like to activate the inhibit
function by pulling inhibit signal from logic high to logic low, the buffer module will shut down the internal
converters and bulk electrolytic capacitors will be discharged in 3 ~ 5s.
(7) Once the inhibit function is deactivated, buffer module will resume to normal operation automatically.

Page 8 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
4-14. Isolation Test
Isolation resistance between input/output & signal
ports to shall be more than 100M at 500VDC. For
safety purposes, voltage setting on DC isolation tester
must be done before the test. Ensure that the unit is
fully discharged after the test.
Input/Output & signal ports ~ : 500VDC, 100MΩ or
more
4-15. Withstand Voltage
This model is designed to withstand 500VAC between
input/output & signal ports to each for 1 minute.
When testing withstands voltage, set current limit of
withstand voltage test equipment at 100mA. The
applied voltage must be gradually increased from zero
to testing value and then gradually decreased for shut
down. When timer is used, the buffer module may be
damaged by high impulse voltage at timer switch on
and off. Connect input/output & signal ports as
follows :
Input/Output & signal ports ~ : 500VAC
1min 100mA
5. Mounting Directions
5.1. There are 3 mounting methods
recommended.


 
  
  
  
  
  
  
  

 


  
  
  
  
 
  
  
  
( A ) Standard Mounting
( C )
Figure 12
Figure 11
DISCHARGING
CHARGING
24VDC/20A
+V
DBM20
1
+V ‐V ‐V
234
4+
3Buffer
2Ready
1Inhibit
TD
FIXEDMODE
VIN‐1
Buffer
Level
Figure 10
Figure 8
Figure 9
( B )
1Inhibit 4321
CHARGING
DISCHARGING
+V
24VDC/20A
‐V‐V+V
DBM20
Level
Buffer
VIN‐1
FIXEDMODE
TD
2Ready
3Buffer
4+

Page 9 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
5.2. Mounting spacing vs. airflow
5.3. terminal on input/output connector
terminal must be connected to the Protective earth
terminal of the equipment. If not connected to the
Chassis(Conductor), the conducted noise, radiation noise
and output noise will increase.
5.4. Buffer Module mounting on DIN RAIL (TS35
or equivalent)
Make sure input and output wires are disconnected before
mounting buffer module onto rail
5.4.1 Refer to figure 14.
5.4.2 Tilt the unit slightly rearwards, fit the unit
over top hat rail
Figure 14
Figure 13
Do not exceed the buffer derating. Please refer to section 6. Leave enough space surround the units to ventilate heat
efficiently.
Minimum Installation clearances:
40mm on top, 20mm at the bottom, A=5mm which is recommended on the left and right side when products are permanently
loaded with full 480W in Ready mode.
In case the adjacent device is a heat source, A=15mm clearance is recommended.
The ambient temperature (Ta) is reference 20mm from the bottom of the unit.
20mm
or
more
20mm
or
more
40mm
or
more
40mm
or
more
AirFlow
A A
DISCHARGING
CHARGING
24VDC/20A
+V
DBM20
1
+V ‐V ‐V
234
4+
3Buffer
2Ready
1Inhibit
DISCHARGING
CHARGING
24VDC/20A
+V
DBM20
1
+V ‐V ‐V
234
4+
3Buffer
2Ready
1Inhibit
DRF480‐24‐1
24VDC/20A
+V +V ‐V ‐V DC OK
DCOK
V.ADJ
PEAK
100‐240VAC
NL
TDTDTD
FIXEDMODE
VIN‐1
Bu ffer
Level
FIXEDMODE
VIN‐1
Buffer
Level

Page 10 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
5.4.3 Refer to figure 15 below.
5.4.4 Slide it downward until it hits the stop.
5.4.5 Press against the bottom front side for locking.
Shake the unit slightly to check the locking action.
5.4.6 In order to tighten the unit mounting, the Din rail
stopper attached on both sides of the unit is
recommended.
5.5. Buffer Module removal from DIN RAIL
5.5.1 Refer to figure 16.
5.5.2 Switch off power and disconnect your system
from the supply network. Pull the Latch on the rear
lower edge of the unit downwards and gently lift lower
front edge of the unit (tipping upwards) and remove it.
6. Buffer Derating – DBM20
7. The Life Expectancy
The life expectancy of buffer module depends on the life of
the built-in aluminium electrolytic capacitors. The life is
described in reliability data.
The life of the aluminium electrolytic capacitor varies
depending on the method of mounting the buffer module, the
load current and the ambient temperature. Please refer to the
“Electronic Capacitor Lifetime”.
Please do not use the product which passed over the life
expectancy. There is a risk of unexpected buffer shutdown
and specifications may not be satisfied.
Please contact us for maintenance or exchange the product
which exceeded the life expectancy.
8. Wiring Method
Use all wires as thick and short as possible to make
lower impedance. Noise can be eliminated by attaching
capacitor to the load terminals.
For safety and EMI considerations, connect of
input/output connector to ground terminal of equipment.
Caution on use :
a) Kindly keep the input wires as short as possible, this is
to avoid mistriggering of signals during dynamic load
conditions.
9. EMC
This model complies with the provisions of the EMC
directive and meets the following standards :
Emissions: EN55032 Class B, CISPR32-B
Immunity: EN61000-4-2, -3, -4, -5, -6
0
25
50
75
100
125
-25 0 25 50 75 100
BUFFER CURRENT (%)
Ta (
o
C)
DERATING CURVE
Figure 16
Figure 15
REMOVALLATCH

Page 11 of 11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
EMI (CE) compliance to be confirmed at system level.
Product is considered as a peripheral accessory to
Power supply.
10. DBM20 UL508 Listed Condition
1) Wire requirement is rated at minimum 105°C and to use
copper conductor only.
2) For use in a Pollution degree 2 environment only.
3) These products are considered for use where maximum
surrounding air temperature does not exceed 70°C.
When installing these products please refer to section 6 for
derating.
4) Recommended for indoor use only.
11. Warranty period
This product is warranty for a period of 5 years from the date
of shipment.
For damage occurring at normal operation within this
warranty period, repair is free of charge.
Please read the General Safety Instruction before using the
products.
Product marking:
TDK-Lambda Singapore Pte. Ltd.
(Sales, Services and R&D)
1008 Toa Payoh North #06-01/08, #07-01/03
Singapore 318996
Telephone: [phone]
Facsimile: [phone]
WEBSITE: www.tdk-lambda.com.sg
Note : Name plate's contents shown in this instructimanual
is for reference only.
12. Before concluding that the unit is at fault.
Before concluding that the unit is at fault, make the
following checks.
Check if the rated input voltage is connected.
Check if the wiring of input and output is correct.
Check if the wire size is not too thin.
Check if the buffering current and wattage is not over
specification.
Check if the GREEN LED lights up during Ready mode and
RED LED lights up during Buffer mode.
Audible noise can be heard during Dynamic-Load Buffer
mode operation.
13. Returns
Please contact your local sales office or visit our website to
arrange return of any faulty product.
NOTE : Model name, input voltage range, nominal output
voltage, maximum output current, country of manufacture
and safety marking (for only approved products) are shown
here in accordance with the specifications.
Figure 17