TDK-Lambda ZWS-BP Series User manual

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A252-04-01D
TDK-Lambda
ZWS-BP Series
InstructionManual
ZWS-BP Series
Instruction Manual
BEFOREUSINGTHEPOWERSUPPLYUNIT
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 could 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.
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.
•For products with no cover, do not touch them as there are high-voltage and high temperature parts inside. Touching them might cause injury
such as electric shock or burn.
•There are cases where high voltage charge remains inside the product immediately after the input is cut off. Therefore, do not touch even if they
are not in operation as you might get injured due to high voltage and high temperature.
•Do not make unauthorized changes to this product nor remove the cover as you might get an electric shock or might damage the product. We
will not be held responsible after the product has been modified, changed or dis-assembled.
•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 shut off the product.
•Do not operate and store these products in environments where condensation occurs due to moisture and humidity. It might lead fire and electric
shock.
•Do not drop or apply shock to this product. It might cause failure. Do not operate these products mechanical stress is applied.
•When necessary, this products is to be repaired only by us or our authorized agents.
It is important that this product cannot be used in hazardous environments (facilities such as nuclear power control system or life support
equipment) without our written consent.
CAUTION on MOUNTING
•Confirm connections to input/output terminals are correct as indicated in the instruction manual before switching on.
•Input voltage, Output current, Output power, ambient temperature and ambient humidity should be kept within specifications, otherwise the
product will be damaged.
•Input line, please use the wires as 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 be ventilated.
•Please shut down the input when connecting input and output of the product.
•When installing in environment where conductive foreign, dust and liquid may be present,
please consider penetration of above foreign material in the power supply by installing filter, 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, Output current, Output 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. Be sure to request repair
to our company.
•For products without built-in protection circuit (element, fuse, etc.), insert fuse at the input to prevent smoke, fire during abnormal operation.
As for products with built-in protection circuit, depending on usage conditions, built-in protection circuit might not work. It is recommended to
provide separate proper protection circuit.
•For externally mounted fuse do not use other fuses aside from our specified and recommended fuse.
•This product was 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, providing redundant circuit to ensure no instability when single device failure occurs).

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TDK-Lambda
ZWS-BP Series
InstructionManual
•When used in environments with strong electromagnetic field, there is possibility of product damage due to malfunction.
•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 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 risk of electric shock.
•Parts with lifetime specifications (built-in electrolytic capacitor) are required to be replaced periodically. Set the overhaul period depending on
the environment of usage and perform maintenance. Also, note that there are cases when EOL products cannot be overhauled.
•Take care not to apply external abnormal voltage to the output. Especially, applying reverse voltage or overvoltage more than the rated voltage
to the output might cause failure, electric shock or fire.
•This product is designed under condition Material group Ⅲb, Pollution Degree (PD): PD2, Over Voltage category (OVC): OVCⅡand Class
of equipment: Class Ⅰ.This product is designed to be accessible only to service technicians as part of indoor use device.
•This product contains a printed circuit board utilizing surface mounted devices. PCB stress such as bending, twisting etc. could cause damage.
Therefore, please handle with care.
•When handling this product, hold the board edge and take care not to touch the component side. When installing this product in apparatus or
equipment, mount it on spacers.
•The outputs of this product may, under fault conditions, exceed SELV voltage limits. Therefore the outputs must be protected in the end
equipment to maintain SELV.
•This product has used Power Thermistor to protect the circuit from Inrush Current. Frequent repetition of input might cause damage to internal
components because of generating surge current.
•The output power of this product is considered to be a hazardous energy level (The voltage is 2V or more and the power is 240VA or more). It
must not be made accessible to users. Protection must be provided for Service Engineers against indirect contact with the output terminals
and/or to prevent tools being dropped across them. While working on this product, the AC input power must be switched off and the input and
output voltage should be zero.
Note
•Take note that traces of sheet metal processing be left in our power supplies.
•When disposing product, follow disposal laws of each municipality.
•Published EMI (CE, RE) or immunity is the result when measured in our standard measurement conditions and might not satisfy specification
when mounted and wired inside end-user equipment. Use the product after sufficiently evaluating at actual end-user equipment.
•When exporting our products, apply for necessary permissions as required by rules and regulations of Foreign Exchange and Foreign Trade
Control Act.
•Catalogue, 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 forbidden without our permission.
Note: CE MARKING
CEMarking,when appliedtoaproductcoveredbythishandbook,indicatescompliancewiththelowvoltagedirective.
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.
•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 recommend to use within 2 years after receiving the product.
There is tendency that the leakage current of an aluminum electrolytic capacitor may increase when stored without using for a long time.
This phenomenon can be improved by applying voltage to the aluminum electrolytic capacitor to reduce the increased leakage current through
the self-recovery effect of the electrolyte.
For reference, before using products that have been stored for a very long time, please warm-up first for 30 minutes or more without taking load.
< Criterion of warm up voltage condition >
(1)Implementation period : 1 year or above after the delivery
(2)Electrical continuity condition
Input voltage : Rating
Load : 0A
Ambient temperature : Normal temperature
Time : 30 minutes or more

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TDK-Lambda
ZWS-BP Series
Instruction Manual
1．Model name identification method
ZWS 150 BP – 24 / □
Option
Blank
：Standard type.
Rated Output Voltage /L ：With chassis model.
/A ：With chassis and cover model.
Output Power type /R ：With remote ON/OFF control model.
/T ：With terminal model.
Series Name （T : ZWS240BP only）
2．Terminal Explanation
ZWS150BP
COMPONENT
SIDE
OUTPUT
INPUT
①
⑤
②
③
④
⑤
④
⑧
⑥
⑦
⑨
ZWS240BP
COMPONENT
SIDE
①
②
③
④
⑤
OUTPUT
INPUT
⑤
④
⑧
⑥
⑦
⑨
⑤
① L : AC Input terminal Live line (Fuse in line.)
② N : AC Input terminal Neutral line
③ : Earth ( ) Terminal
④ Mounting hole (hole diameter : φ3.5mm)
These holes are connected to terminal of CN1.
Must be connected to Chassis (Conductor) of the equipment by metal spacer.
The mounting surface of the spacer should be within Maxφ8mm.
⑤ Mounting hole (hole diameter : φ3.5mm)
These holes are not connected to terminal of CN1.
⑥ + : + Output Terminal
⑦ - : - Output Terminal
⑧ V.ADJ : Output voltage adjust trimmer. The output voltage rises when a trimmer is turned clockwise.
⑨ ON/OFF Control Terminal (Option model “/R”)

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TDK-Lambda
ZWS-BP Series
Instruction Manual
3．Block Diagram
ZWS150BP
ZWS240BP
● Circuit topology, switching frequency
Switching Circuit
Cascade forward topology 120kHz
PFHC Circuit
Active filter 65kHz (fixed)
● Fuse rating
ZWS150BP : 6.3A
ZWS240BP : 10A
Inrush Current Limit Circuit
Rectifier
Filter
Switching Circuit
L
N
Control Circuit
OCP
Circuit
OVP
Sensing
Output
Sensing
Photo-
coupler
Photo-
coupler
Rectifier & Filter
Input
85～265VAC
FG
+
-
Output
PFHC Circuit
Line Filter
OVP
Circuit
Remote
ON/OFF
Control
Photo-
coupler
+R
-R
Control Circuit
*Option model “/R”

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TDK-Lambda
ZWS-BP Series
Instruction Manual
4. Sequence time chart
ZWS150BP
ZWS240BP
(※1) +R & -R Level
Higher than 4.5V : ON
Lower than 0.8V : OFF
(※2) OVP Point
24V : 120%～140%
36V,48V : 115%～135%
(※3) Peak current condition
Operating time at peak output is less than 5 sec, duty is less than 40%.
When the Product operate peak Current for more than 5 sec,
the delay shut down function operates and the output will shut down.
Input on
Input off
Input on
Remote off
Remote on
OVP act on
Delay shutdown
Peak current condition
Input off
Input on
Input off
Over current condition
Over current reset

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TDK-Lambda
ZWS-BP Series
Instruction Manual
5. Terminal Connection Method
Pay attention to the input wiring. If it is connected to wrong terminal, the power supply will be damaged.
· Input must be off when making connections.
· Connect terminal of input connector to protective earth terminal.
· Output current of each terminal pin must be less than 5A.
· The output load line and input line shall be separated to improve noise sensitivity.
· Do not apply stress to PCB, when connecting or removing connector.
· Use input/output connector (housing) specified by the table below.
· Use recommended crimping tool. Connector is not included with this product. (Refer to the following)
ZWS150BP
COMPONENT
SIDE
OUTPUT
INPUT
LOAD
ZWS240BP
COMPONENT
SIDE
OUTPUT
INPUT
LOAD
Input/Output Connector
Model Connector Housing Terminal Pin Maker
Input
( CN1 )
Common B3P5-VH(LF)(SN) VHR-5N SVH-21T-P1.1
BVH-21T-P1.1 JST
Output
( CN51 )
ZWS150BP B6P-VH(LF)(SN) VHR-6N
ZWS240BP B8P-VH(LF)(SN) VHR-8N
Hand Crimping Tool : YC-160R (JST)
Remote ON/OFF Control : Option model “/R”
Model
Connector
Housing
Terminal Pin
Maker
CN52 B2B-XH-AM XHP-2
BXH-001T-P0.6
or
SXH
-
001T
-
P0.6
JST
Hand Crimping Tool : YC-110R (JST) or YRS-110 (JST)

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TDK-Lambda
ZWS-BP Series
Instruction Manual
6．Explanation of Function and Precautions
6-1. Input Voltage Range
Input voltage range is single phase 85-265VAC(47-63Hz) or 120-370VDC. Input voltage, which is out of specification, might lead unit
damage. For cases where conformance to various safeties required, described as 100-240VAC (50-60Hz).
Output derating is required for AC input voltage less than 90VAC.
6-2. Output Voltage Range
Output voltage is set the rated value at shipment. V.ADJ trimmer (VR51) can adjust the output voltage within the range. Output voltage range
is within output voltage variable range. To turn the trimmer clockwise, the output voltage will be increased. Take note when the output
voltage is increased excessively, over voltage protection (OVP) function may trigger and voltage will be shut down. Furthermore, when
increasing the output voltage reduce the output current so as not to exceed the maximum output power.
6-3. Inrush Current
This series equipped Power thermistor to limit the inrush Current. This series are Power thermistor method so that higher current will flow at
higher ambient temperature or re-input condition. Please select input switch and fuse carefully with the high temperature and re-input the
power condition. The Inrush Current value is under cold start at 25℃ in the specification.
6-4. Delay Shut Down
This product have a delay shut down function provided to protect power supply and equipment at the time of the consecutive peak current
and output short-circuit. When the product operate peak current and output short-circuit for more than 5 seconds, delay shut down function
operates and the output will be shut down.
To reset delay shut down, remove the input of power supply for a few minutes, and then re-input.
Delay Shut Down Time value is fixed and not to be adjusted externally.
Use it about the peak electricity in specifications range. The details see at “7-2. Output Peak Power”
6-5. Over Current Protection (OCP)
ZWS150BP, ZWS240BP : Constant current limit with automatic recovery.
OCP function operates when the output current exceeds 201% of average output current of specification. The outputs will be automatically
recovered when the overload condition is canceled. Never operate the unit under over current or shorted conditions, which may leads damage
or insulation failure. OCP setting is fixed and not to be adjusted externally.
6-6. Over Voltage Protection (OVP)
The OVP function (Inverter shut down method, manual reset type) is provided.
OVP function operates within 24V: 120% - 140%, 36V - 48V: 115% - 135% of nominal output voltage. When OVP triggers, the output will
be shut down. To reset OVP, remove the input of power supply for a few minutes, and then re-input. In addition, the setting value of OVP is
fixed and not adjustable. Pay attention not to apply higher voltage externally to the output terminal to avoid unit failure. In case of inductive
load, put protective diode in series to the output power line.
6-7. Output Ripple & Noise
The standard specification for maximum ripple value is measured according to measurement circuit specified by JEITA-RC9131B. When
load lines are longer, ripple will becomes larger. In this case, electrolytic capacitor, film capacitor, etc. might be necessary to use across the
load terminal. The output ripple cannot be measure accurately if the probe ground lead of oscilloscope is too long.
LoadC1
150mm
C2
Coaxial Cable
1.5m 50Ω
R1
C3
Oscilloscope
Bandwidth : 100MHz
Power
Supply
+
‐
C1 : 0.1uF Film Cap.
C2 : 100uF Electric Cap.
C3 : 4700pF Ceramic Cap.
R1 : 50Ω
A

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TDK-Lambda
ZWS-BP Series
Instruction Manual
6-8. Series Operation
For series operation, either method (A) or (B) is possible.
ZWS150BP, ZWS240BP
Output
Terminal
Output
Terminal
Load
Output
Terminal
Output
Terminal
Load
Load
(A) (B)
Power Supply Power Supply
Note : In case of (A), Never use when one of the unit not operate, which may leads damage.
6-9. Parallel Operation
For parallel operation, method (B) is possible.
ZWS150BP, ZWS240BP
Load
Output
Terminal
Output
Terminal
Load
Output
Terminal
Output
Terminal
(B) To use as Back-up Power Supply
1. Adjust the output voltage of each power supply to be the same.
2. Set power supply output voltage higher by the forward voltage
drop (Vf) of diode.
Use within the specification for output voltage and output power.
(A) To increase the output current is not possible.
Power Supply
Power Supply
0
6-10. Isolation Test
Isolation resistance between Output - is more than 100MΩat 500VDC. For safety operation, voltage setting of DC isolation tester must
be done before the test. Ensure that the unit is fully discharged after the test.
Output - : 500VDC More than 100MΩ
ZWS150BP, ZWS240BP ZWS150BP/R, ZWS240BP/R
AC(L)
AC(N)
+
_
Isolation
Tester
AC(L)
AC(N)
+
_
Isolation
Tester +R(CN52)
_
R(CN52)

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TDK-Lambda
ZWS-BP Series
Instruction Manual
6-11. Withstand Voltage
This series is designed to withstand 3.0kVAC between input and output, 2.0kVAC between input and and 500VAC between output and
each for 1 minute. When testing withstand voltage, set current limit of the withstand voltage test equipment to 10mA (output - : 20mA).
The applied voltage must be gradually increased from zero to the testing value and then gradually decreased for shut down. When timer is
used, the power supply may be damaged by high impulse voltage at timer switch on and off. Connect input and output as follows.
Input - Output(Dashed line) : 3.0kVAC 1min(10mA)
Input - (Solid line) : 2.0kVAC 1min(10mA) Output - : 500VAC 1min(20mA)
ZWS150BP, ZWS240BP
ZWS150BP/R, ZWS240BP/R
Note 1 : This product have monolithic ceramic capacitor in secondary circuit to .
Some of the withstand voltage tester may generate high voltage at the matching with monolithic ceramic capacitor and may cause the unit damage.
So, please check the waveform of applied voltage.
Note 2 : In case of using external noise filter, capacitance between “Input and ” might be increased. When testing withstand voltage between “Input and
Output”, there is a possibility exceeding withstand voltage between “Output and ” (500VAC). Please check the voltage between
“Output and ”. If the voltage exceeding withstand voltage, please add external capacitor to “Output and ”. It can decrease the voltage.
On the other hand, no need to check the voltage in case of “Output and ” is shorted.
AC(L)
AC(N)
+
_
Withstand
Voltage
Tester
AC(L)
AC(N)
+
_
Withstand
Voltage
Tester
AC(L)
AC(N)
+
_
Withstand
Voltage
Tester
+R(CN52)
-R(CN52)
AC(L)
AC(N)
+
_
Withstand
Voltage
Tester
+R(CN52)
-R(CN52)
The example of noise filter circuit that
may increasing capacitance value between
“Input and ”
(Capacitance value in dashed line
is added.)
External capacitor adding point
or short point.
Even in the case of “+V and ”,
There is a similar effect.

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TDK-Lambda
ZWS-BP Series
Instruction Manual
6-12. Remote ON/OFF Control (Option model “/R”)
Remote ON/OFF control (CN52) function is available as option. ( /R).
Using this function allows the user to turn the output on and off without having to turn the AC input on and off.
It is controlled by the voltage applied to +R and –R. This circuit is in the Secondary (output) side of the power supply unit. Do not connect in
the Primary (input) side. And this circuit is isolated from the Secondary (output).
The standby power in control OFF is 100VAC input: 0.15W(typ), 200VAC input: 0.5W(typ). (but the loss of the outside circuit to apply does
not include it.)
E
Power
Supply
1kΩ
+R
-R
SW
R
R : External resistance
E : External voltage level
+R & -R terminal condition
SW ON (Higher than 4.5V)
SW OFF (Lower than 0.8V)
Output Condition
ON
OFF
External voltage level: E
4.5 - 12.5VDC
12.5 - 24.5VDC
External resistance : R
No required
1.5ｋΩ

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TDK-Lambda
ZWS-BP Series
Instruction Manual
T
Wp
Wm
t
0(W)
T
Wp
Wm
t
0(W)
a(W)
7．Mounting Directions
7-1. Mounting Directions.
Recommended standard mounting method is (A). Method (B)-(F) are also possible. From an mounting method and power supply ambient
temperature, use the output derating of the power supply in specifications value of standard. The details see at “7-3. Output Derating”
CN1
(INPUT)
CN1
CN1 CN1
(A) Standard
Mounting
(B) (C) (D) (E) (F)
FIN
CN1
FIN
CN1
7-2. Output Peak Power
This product must be use to satisfy (a) and (b).
Allowable peak output operating time is less than 5sec.
When the product operate peak power for more than 5 sec, the delay shut down function operates and the output will shut down.
Peak output power and average output power use less than specification.
Peak output power is limited depending on Duty. The details see at (b).
The product might be damage to use beyond the limits of (a) and (b).
When using pulse load, a noise may be heard from power supply unit. Please evaluate and check before using.
(a) Expression of relations
formula about Duty
(%)100´
T
=
t
Duty
formula about average output power
T
´
=³
t
Wp
WmWavg
(
)
a
aWp
WmWavg +
T
´
-
=³
t
Wp
：
Peak output power ( W )
τ
：
Pulse width of peak output power ( sec )
Wavg
：
Average output power of Specification ( W )
T
：
Period ( sec )
Wm
：
Average output power ( W )
Duty
：
The duty is pulse width of peak output
power of one period(%)
（b） Peak output power vs Duty
ZWS150BP ZWS240BP
0
150 Peak output power (W)
Duty(%)
5
10
15
20
25
30
35
40
180 210
0
240
Peak output power (W)
Duty(%)
5
10
15
20
25
30
35
40
300 360 420 480 300
45
45
240 270 330

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TDK-Lambda
ZWS-BP Series
Instruction Manual
7-3. Output Derating
The following input voltage derating curve assumes average output load is 100%. (Peak power dose not have the derating.)
■CONVECTION COOLING
ZWS150BP
Mounting (A)
Mounting (B),(C),(E)
Mounting (D),(F)
Ta
(°C)
-10 - +30
+40
+50
+60
+70
Average Load (%)
Mounting(A) Mounting(B),(C),(E) Mounting(D),(F)
100
100 80
100 80
75 40
50 40
100
60
60
20
Ta (°C)
Average Load(%)
0
20
40
60
80
100
120
-10 0 10 20 30 40 50 60 70 80
ZWS240BP
Mounting (A)
Mounting (B),(C)
Mounting (E)
Ta
(°C)
-10 - +20
+30
+40
+50
+60
Average Load (%)
Mounting(A)
100
Ta (°C)
Averge Load(%)
0
20
40
60
80
100
120
-10 0 10 20 30 40 50 60 70 80
Mounting(B),(C) Mounting(E) Mounting(D),(F)
100
100
65
30
100 78 64
77 55 46
53
30
32
10
28
10+70
100 100 100 82
Mounting (D),(F)
■FORCED AIR COOLING
ZWS150BP, ZWS240BP
Electrolytic capacitor allowable Max temparature
Mounting (A) - (F)
Mounting(A) - (F)
ZWS150BP
C7
Model
Allowable Max temparature
ZWS240BP
85°C
75°C
C52
75°C
75°C
Ta
(°C)
-10 - +60
+70
Average Load (%)
100
70
80
100
120
80
60
40
20
0
-10 0 20 40 5010 30 60 70
Average Load (%)
Ta (°C)
The entire component must be cooled. The maximum temperature of the electrolytic capacitor
C7 and C52 must keep lower than “Electrolytic capacitor allowable Max temperature” in the above
table. As reference, set wind velocity at 0.7m/s or 1.5m/s.At the time of a forced air cooling,
average load varies according to the wind velocity. Please confirm specifications, and be careful.
ZWS150BP
ZWS240BP
CN1
C52
(INPUT)
C7
CN1
(INPUT)
C7
C52
■Average load (FORCED AIR COOLING）
Model 0.7m/s 1.5m/s
ZWS150BP 150W 200W
ZWS240BP 240W 300W
Set wind velocity

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TDK-Lambda
ZWS-BP Series
Instruction Manual
7-4. Derating curve depending on input voltage
Input voltage (VAC)
Average Load(%)
80
85 90
100
The following input voltage derating curve assumes
average output load is 100%.
(Peak power dose not have the derating.)
7-5. Mounting Method
Insert the spacer (Maxφ8) of height more than 8mm to lift the unit. And use all mounting holes A for the unit installation. The vibration spec
is specified under this mounting condition.
Please use mounting hole B as needed. Vibratility-resistant improves.
■Mounting Holes size
ZWS150BP ZWS240BP
4 holesφ3.5mm. 5 holesφ3.5mm.
A AA
AAA
A
A
B
CN1 (Input) CN1 (Input)
Height more than
8mm spacer
Height more than
8mm spacer
Allowable area by metal pieces (Solder side) is the hatched area. Refer to figure below
ZWS150BP ZWS240BP
9mm
9mm
9mm
9mm 9mm
9mm
9mm
9mm
9mm
9mm
9mm
9mm 9mm
9mm
9mm
9mm
9mm
9mm

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TDK-Lambda
ZWS-BP Series
Instruction Manual
■Condition to meet Isolation & Withstand Voltage standard.
More than 8mm
COMPONENT SIDE
PCB
More than
4mm
Keep 4mm space from the surfaces and sides of PCB. Especially,
8mm space is necessary from the solder surface.
If the space is not enough, the specification of isolation and
withstand will not be satisfied.
Take the space in the power supply surroundings and the upper area of
components to keep enough for convection cooling.
More than
4mm
More than
4mm
More than
4mm
More than
4mm
■
should be connected to the protective earth terminal of the equipment. Also 2 mounting holes are should be connected to
the Chassis (Conductor) by metal spacer. If not, the conducted noise, radiation noise and output noise will increase.
8. Wiring Method
(1) The output load line and input line shall be separated each other and twisted individually to improve noise.
(2) Use all lines as thick and short as possible to made lower impedance.
(3) Noise can be reduced by attaching a capacitor to the load terminals.
(4) For safety and EMI considerations, connect between terminal of input connector and protective earth terminal firmly.
9. The life expectancy
The life of the power supply depends on the life of the built-in aluminum electrolytic capacitor. The life is described in reliability data.
The life of the aluminum electrolytic capacitor varies depending on the method of mounting the power supply, the load current, and the
ambient temperature. Please refer to “Electrolytic Capacitor Lifetime”.
Please do not use the product which passed over the life expectancy. There is a risk of unexpected output shutdown and specifications may
not be satisfied.
Please contact us for maintenance or exchange the product which passed over the life expectancy.
Earth
Terminal
Protective
NL
+
-
Wire Input
Chassis (Conductor)
Output
Metal spacers

-15-
TDK-Lambda
ZWS-BP Series
Instruction Manual
10. External Fuse Rating
Refer to the following fuse rating when selecting the external fuses that are to be used on input line. Surge current flows when line turns on.
Have to use slow-blow or time-lag type fuse, not fast-blow fuse. Fuse rating is considered by in-rush current value at line turn-on. Do not
select the fuse according to input current (RMS.) values under the actual load condition
ZWS150BP : 6.3A
ZWS240BP : 10A
11. Before concluding that the unit is at fault
(1) Check if the rated input voltage is connected.
(2) Check if the wiring of input and output is correct.
(3) Check if the wire thickness is enough.
(4) Check if the output current and output wattage dose not over specification.
(5) Check if the output voltage control (V.ADJ) is properly adjusted. OVP might be triggered and output is shut down.
(6) Audible noise can be heard when input voltage waveform is not sinusoidal wave.
(7) Audible noise can be heard daring Dynamic-Load operation.
12. Warranty Period
This product is warranted for a period of 5 years from the date of shipment.
For damages occurring at normal operation within this warranty period, repair is free of charge.