Please see catalog and instruction
manual before you use

INDEX
1. Before using our product……………………………………… 2
2. Environmentally Friendly Products and ist Symbol………… 4
3. Quality assurance system……………………………………… 5
4. Repair and service……………………………………………… 6
5. If you think a power supply is in failure……………………… 7
6. Caution For Safety And Products……………………………… 10
7. Handling Of Rugged PCB Unit………………………………… 13

1

1. Before using our productWarning◆	When the product is in operation, inside there are components which have high voltage and hightemperature. They may cause electrical shock or burn if you touch the internal components.
◆	Do not modify, disassemble or remove the enclosure of the product. This may cause electrical shock, burnor fire hazard.
◆	When the product is operating, keep your hands and face away from it. This may cause injury by accident.
◆	Install the product firmly in accord with the instruction manual. Inadequate installation may cause anelectric shock, burn injury, or a fire hazard.
◆	The products should be installed by fully trained and experienced workers to avoid a possibility of electric

shock or a fire hazard.
◆	Do not cover the product with things like cloth and paper. Do not put any flammable items around the

products. It may cause a malfunction, an electric shock, or fire.

Attention◆	It is necessary to read the instruction manual and catalog.

Please confirm the content of the catalog andinstruction manual before you use our products.
◆	Our products are designed and manufactured for the usage within ordinary industrial equipment, notfor the usage requiring high safety (Such a high safety usage needs extremely high reliability. If neither
reliability nor safety is secured, it will cause serious hazards on body or life directly). Although Cosel
makes every effort to improve quality and reliability, the products may accidentally malfunction or fail.
Therefore for your safety, consider to set up a safety measure such as the fail-safe function (a systemthat a protection circuit and protection device are built in or that a redundancy circuit is inserted in orderto prevent the instable operation by the sole failure of the products) when using the products for the highsafety use. If customers use the products for the high safety usage above mentioned, Cosel will not be
responsible for any compensation requests claimed by the customers and/or third parties.
◆	Use the products within the specified input voltage, output current, output power, range of ambient

temperature and ambient humidity. If the products are used beyond the specifications, it may damage theproducts or cause smoke or fire.
◆	Do not use the products in environments with direct sunlight, some conductive substances, dust, water,condensation, strong electromagnetic field, or corrosive gas (such as hydrogen sulfide and sulfur dioxide).
It may cause a malfunction or failure of the products, smoke or fire at the worst case.
◆	If an internal fuse gets blown out, do not use the products by replacing the fuse. There may be sometroubles in the products. Be sure to request us to repair the products.
◆	If the products do not have protection circuits such as protection elements and/or fuses, insert fuses in

between our product and your equipment in order to prevent smoking and fire by abnormal operationof the products. An appropriate use of protection circuits is recommended even for the products withprotection circuits since the internal protection circuit may not operate by some usage conditions. Also, be
careful that internal fuses may not work depending on conditions of input line and input wiring.
◆	Use the only fuses designated or recommended by Cosel for external fuses.
◆	Make sure to take a protective measure against the surge voltage brought by lighting and so on. An

2abnormal voltage may damage the products.
◆	Connect the frame ground terminal of the products to the safety ground terminal of your equipment forsafety and reducing noise. If the ground connection is not made properly, it may cause an electric shock
hazard.
◆	External abnormal voltage should not be applied to the output of the products. Especially, when reversed

voltage or overvoltage beyond the actual output voltage is applied to the outputs, it may cause a failure,
an electric shock, smoke, or fire.
◆	Components may remain high voltage and high temperature even in products without a cover. Do nottouch them. Touching those components may cause an electric shock hazard or burn injury.
◆	Do not touch any components inside the products since they may remain high voltage and hightemperature even though the products are not in operation. It can cause an electric shock hazard or burninjury.
◆	Do not modify, disassemble, or open the products. It may cause an electric shock hazard, burn injury, or afire hazard. Cosel is not responsible for any damage caused by modifications, disassembles, or reworks.
◆	Stop using the products and cut off the power when unusual operations such as abnormal output, strange

odor, peculiar sound, or smoke are found. It may cause an electric shock or a fire. Contact us when theseabnormal incidents occur. Do not repair the products as it is very dangerous.
◆	Do not use the products when they are dropped or given an excessive shock. Dropping or giving shocks

to the products may cause malfunction.
◆ When you export the product, please comply with all appropriate export-related laws, and procedures.
※	The content of the catalog may be changed without advanced notice.

If necessary, please request product specification from our representatives before ordering.

Disclaimer◆	Regardless of whether or not the products are within the warranty period, Cosel will not be responsible

for any damage that is not attributed to Cosel and for opportunity losses and lost earnings on customers
caused by the products' failures. And regardless of whether or not Cosel could predict, we will not takethe responsibilities for any damage, secondary damage, compensations for accidents, damage on any
products other than Cosel products and other affairs caused by extraordinary conditions.

32. Environmentally Friendly Products and its Symbol
We have developed a new internal evaluation system on environmental burdens in order to provide ourcustomers with information on our products and our efforts to promote the development of environmentallyfriendly products since 2010.
We are looking at the following 3 items in evaluating our products to reduce their environmental burdens.
(1) Environmental burdens generated when our products are in operation at customers' site.
(2) Environmental burdens generated when our products are manufactured at our factories.
(3) Environmental burdens generated when materials and components we purchase are manufactured.
Based on the above 3 items, we set our own criteria to certify and register
products which satisfy our criteria as “Eco Products.” These Eco Products arehighly efficient in reducing environmental burdens. To promote Eco Products,
we developed the following symbol which represent Eco Products.
We will proactively expand our Eco Products to create an environmentallyfriendly low-carbon recycling-oriented society and to continue to grow with ourcustomers.

43. Quality assurance system
In order to ensure the implementation and maintenance of various processes, the quality management
system has been established with the manager of the quality management department as the quality
management supervisor.
We have established the quality assurance system by defining basic requirements in the processes fromproduct planning, development and quality evaluation, to mass production, shipment and service, defining
these requirements in the quality manual and developing and documenting the rules in each step in order toprovide products that meet customer needs in a more timely manner.
Cosel’s quality assurance structure is shown below.
We are striving to solve quality issues by holding regular meetings. The quality management supervisor
and managers of the development department, production department, and quality management department
attend the meeting and make efforts to reduce quality-related problems.
Quality assurance structure
STEP

Customers

President

Planning

User needs

Sales�Dept.

Development�Dept.

Collection ofmarket information

Collection oftechnical information

Management policy

Production�Dept.

QM�Dept.

Purchasing�Dept.

New products planning
New product planning meeting 1
Basic design
New product planning meeting 2

Development/Design

Detailed design
DR 1 (Design review 1)
Trial production
evaluation
Mass production
designProcess design / Jig and tool design
Production preparation meeting 1
DR 2 (Design review 2)

Production
preparation

Process design
Jig and tool design
Evaluation

Production preparation meeting 2

Quality evaluation

Trial production formass production

Redesign
Evaluation
Redesign/Production
Qualityevaluation
Redesign/Production
Approval ofmass production
Order placement

Production plan

Order reception

Materials
Production

Inspection ofpurchased items
Assembly
Test/Finish
Shipment
inspection
Use

DeliveryWarehousing

Quality
improvement

Internal quality audit
Quality Assurance Committee
QC diagnosis

54. Repair and service
When a failure in product is found, contact our distributors or our sales subsidiaries.

1. Free Repair
Repair is free of charge when the following cases apply:(1)If the product returned is still within warranty period and damages are due to component failure.
(2)Damages are due to Cosel's manufacturing and design errors.

2. Charged Repair
Repair is charged when the following cases apply:(1)Products' warranty period has expired.
(2)Electrical or physical damages are caused by customer.
(3)The product returned is over 6months from first operation but no problem is found after analysis.
(4)Damages are due to use outside of our published specifications.
(5)Damages are caused by Acts of God such as fire, flood, earthquake, etc.
(6)Time-deteriorating parts such as electrolytic capacitors, cooling fans, etc. are replaced.

3. Warranty After Repair(1)As for the products whose regular warranty period has expired, the repaired products will have a
3-month warranty.

4. Repair and Service Network
When a failure in product is found, please return the products in the following way:

Distributors*
Customers

Subsidiaries**Please refer to Sales Network in this catalog.

6

Cosel
Customer
Service5. If you think a power supply is in failure
When power supplies do not function properly, please check the following troubleshooting table before
returning a unit. If the power supply still has a problem, please contact the designated distributors or ourcustomer service desk for information (a Return Merchandise Authorization (RMA) number in U.S.) about
how to return the power supply to us.

(1) In case of No Output - what to check
Input Side
Check Points

SolutionsApplicable Products

Wrong AC voltage is applied.
In case of dual input voltage power supply (AC85-132V
and AC170-264V). Check to see if the power supply needs
jumper selector for AC input and use it properly.

Make sure to use the jumper for the following
models in case of AC85-132V input.

PMC50E - PMC100E

AC voltage is not applied to power supply correctly. - 1
Wrong input connection?
For example, AC(L) or (N) is connected to FG terminal.

Check and correct the input connection if
necessary.

AC voltage is not applied to power supply correctly. - 2
Is external fuse blown?

1)If the built-in fuse is blown, return the power
supply to us for repair.
2)If the built-in fuse has no problem, change
the external fuse to one that can withstand theinrush current of the power supply and has thesame voltage/current rating as the built-in fuse.

All Series

Output Side
Check Points

Solutions1)Wrong connection.
2)Loosened terminal screws. - 1
Is the wiring to the load correct? (For example, +V and -V
are connected reversely).

Correct the connection.

1)Wrong connection.
2)Loosened terminal screws. - 2
Check to see if the wiring to the load shorted together
accidentally.

Correct the problem by checking the wiring
isolation.

1)Wrong connection.
2)Loosened terminal screws. - 3
Terminal screws have loosened?

Tighten the terminal screws.

Overvoltage protection has been operated. - 1
Is output voltage adjuster (trim pot) excessively turned
clockwise?

Switch off the power supply, turn output voltage
adjuster to its maximum counterclockwise,
and wait for 5 minutes before switching on the
power supply again.

LCA, LDC, LDA, LEA

Overvoltage protection has been operated. - 2
Sensing terminal screws have loosened?

Tighten the screws.

R100U, R150U

Overvoltage protection has been operated. - 3
Is sensing wiring correct?

Connect the sensing wires according to the
instruction manual.

Overvoltage protection has been operated. - 4
Are sensing wires disconnected?

Re-connected.

Overcurrent protection has been operated.
Are there any chances that the drawing current has
become greater than the rated output current?

Check the rated output current of the power
supply used and measure the current actuallydrawn from power supply.

All Series

Remote ON/OFF is off.
In case of DC-DC power supply: Is RC terminal connected
to -V input?

Connect (short circuit) RC terminal to -V input.

CES, CQS, CHS, CQHS,
DBS, CDS, CBS, DHS,
SUS, SUCS, SUW, SUCW,
ZUS, ZUW, MG, DAS

Power supplies used in series operation.
Are the power supplies used allowed series operation?

Change the power supplies to those allowed
series operation.

Refer to instruction manuals.

7

Applicable Products

All Series

PBA300F - PBA1500F,
R100U, R150U

Others
Check Points

SolutionsApplicable Products

Thermal protection has been operated. - 1
Is the ambient temperature higher than the specified
maximum operating temperature?

Switch off the power supply and cool it down
under at room temperature before switching on
again.

CES, CQS, CHS, CQHS,DBS,
DHS, CDS, CBS, DPF, DPG,
PBA300F - PBA1500F,
DPA, DAS, LDA300,
KHNA120F - KHNA480F,
KHEA120F - KHEA480F

Thermal protection has been operated. - 2
Are there any obstacles around the power supply that arephysically stopping the built-in cooling fan or the air flow?

Remove the obstacles, switch off the power
supply, and cool it down under at room
temperature before switching on again.

PBA300F - PBA1500F,
PLA300F, 600F

There is a condensing on power supply. - 1
Is there water splash on power supply?

Keep power supply away from water splash!!

There is a condensing on power supply. - 2
Are there any sudden changes in ambient temperature?

Use power supply where ambient temperature
is stable.

8

All Series(2) In case of Abnormal Output Voltage (Too High, Too Low, Unstable) - what to check
When output voltage is too high.
Check Points

Solutions

Output voltage is set too high. - 1
Is output voltage adjuster (trim pot) turned excessively
clockwise?

Applicable Products

Turn output voltage adjuster counterclockwise.

Output voltage is set too high. - 2
Is there any external voltage from another source applied
to the same load?

Change the load circuit so that there will be no
external voltage applied through the load tothe power supply.

Output voltage is set too high. - 3
Have the sensing terminal screw loosened?

Tighten the screws.

R100U, R150U, LDA300

Check Points

SolutionsApplicable Products

Input voltage is too low. - 1
Is input voltage lower than the minimum specified?

Measure the input voltage.

Input voltage is too low. - 2
Is wave form of input voltage distorted?

If distorted, use AVR for input.

Output voltage is set too low.
Is output voltage adjuster (trim pot) turned excessively
counterclockwise?

Turn output voltage adjuster clockwise.

There is a voltage drop caused by output wires. - 1
Is voltage drop caused by long output wires to the load?

Make the output wires shorter.

There is a voltage drop caused by output wires. - 2
Is voltage drop caused by thin (high-AWG) output wires tothe load?

Use thicker (low-AWG) wires.

There is a voltage drop caused by output wires. - 3
Is there any bad connection?

Check the connection.

There is a voltage drop caused by output wires. - 4
Have the terminal screws loosened?

Tighten the screws.

Overcurrent protection has been operated.
Are there any chances that the drawing current has
become greater than the rated output current?

Check the rated output current of the power
supply used and measure the current actuallydrawn from power supply.

All Series

When output voltage is too low.

All Series

When output voltage is unstable.
Check Points

Solutions

There is oscillation caused by remote sensing. - 1
Are the sensing wires too long?

Use electrolytic capacitor between output
terminal (±V, ±M) and sensing terminal (±S).

There is oscillation caused by remote sensing. - 2
Are the sensing wires twisted?

Twist the wires.

Minimum output current required is not drawn.
In case of some Multiple output type power supply, aminimum drawing current is required on +5V output.
Check to see if there is minimum load requirement for the
power supply.

(1)Draw a minimum current required on +5V.
(2)Use a power supply whose +5V output has
no minimum drawing current requirement.

9

Applicable Products

PBA, R100U, R150U, LDA300

1) PMC
2) RMC, LDC

6. Caution For Safety And Products
Use the products within the specified input voltage, output current, output power, range of ambient temperature
and ambient humidity. If the products are used beyond the specifications, it may damage the products or cause
smoke or fire.

(1) Rated input voltage(2) Leakage current

The range of input voltage is specified by products. If
input voltage beyond the specification or reversed voltage to DC-DC converters is applied, it may cause
smoke or a fire hazard.

Leakage current flows between power supply wires
and earth ground within the rated value.
In case of the multiple operation, however, the total
leakage current will be the sum of the leakage current
flows from each power supply.

No

No
+10V

＋

5V

Power supply
Power supply～

5V
Overvoltage

ReversevoltagePower supply－

Power supply
DC-DC Converter→ I 1

I 1 +I 2 +I3 +I4←Leakage current

→ I 2
→ I 3

Oh!

→ I 4
Earth capacitor

Leakage current per unit × 4 set(3) Wires(4) Earth

Rated voltage and current varies depending on a wire.
It is necessary to use thick wires, which cover the
rated output current of a power supply.

The earth terminal of power supply should beconnected to the equipment where power supply isplaced as thicker and shorter to protect electric shock ornoise interference.

PowersupplyPower supply

Unit

FG
×

2A

×

50A

Load A×

Load B(5) Fuse(6) High voltage

When the internal fuse is blown, a power supply ismost likely damaged.
If this happens, please ship the unit back to us forrepair.

Some parts are generating high voltage inside thepower supply. Please do not touch by hand.
200V - 800V
Peak
DO NOT TOUCH

Oh!

fuse blown

Damaged

Failure ofsemiconductor

Power supply

10Generally, switch mode power supplies are designed to operate in controlled environments (e.g. inside theoffice). The products should have a special care because some operating conditions may cause a malfunction or
failure of the products, smoke or fire at the worst case.

1. Environment where some measures need to be taken(1) Water/Humidity(2) Dust

If the products are operated in environments wherewater drops into the products or condensation occurs, it
may cause a malfunction or failure of the products,
smoke or fire at the worst case. In this case, please consider to take a water proof measure.

When the products are operated in a dusty place,components failures such as a fan may occur and dustwith moisture may cause insulation breakdown. Be cautious that these may cause a malfunction or failure of the
products, smoke or fire at the worst case. In this case,please consider to take a dust proof measure.

L

SP

!

H
AS

Dust

!

Oh. NoPower supply withbuilt-in fan

Power supply

Coughing(3) GasWhen the products are operated in environments where a fumigation process (measures against insects when exporting)by halogen compounds such as methyl bromide is implemented or corrosive gas occurs, it may damage components andcause a malfunction or failure of the products, smoke or fire at the worst case.

Halogencompounds(Fumigation
process)

Power supply

Hydrogen sulfide

Chlorine gas

Sulfurous acid gas

2. Measures
To take measures below is suggested when units are used in the environment above.
1. Using units in the environment where units get watered or humidity is very high.
(1) Semi-standard C(coating)(2) Stronger type than semi-standard C(Minor changed unit)
2. Using units in the environment where something conductive is dropped into a unit.
(1) Install air filter to an exhaust part.
(2) Semi-standard C(coating)(3) Stronger type than semi-standard C(Minor changed unit)
1. Attaching tube and silicon rubber to high voltage part.
2. Attaching isolation cover to high voltage part.
3. Using units in the environment where some gas get into units.
(1) Some corresive gas cause units to be failed. Please contact us.
The above may not be perfect measures. Please contact us about details.
11(4) Vibration/Impact
vibrationPsuopwerply

Please be careful when installing products in vibrating or high-impact locations.
Components could be damaged andcause malfunctions, or even worse, cause
smoke or fire.

Impact(5) Temperature
Air flow

Switching power supplies have a finite life cycle, which is significantly affected by ambient temperature. Radical temperature changes
can cause condensation, which could lead to product malfunction or
failure, or possibly smoke or fire.

ClosedNo!

Long
Lifetime

Air flowGood!

← Ventilation hole

Short
Low

Ambient temperatureHigh(6) Electromagnetic field
Environments with a strong
electric field or electromagnetic
waves can damage components
and cause malfunction or failure,or cause smoke or fire.

Electric field

Magnetic field

Electromagnetic
wave

High
voltagePowersupplyPowersupplyPowersupply(7) Storage
Avoid storing product in the following conditions or else product life may decrease and malfunction, deterioration or
failure may occur. Avoid:
Direct sunlight
High temperature, moisture, dust, water, oil or corrosive gas
Locations subject to vibration
Direct sunlight
Power supply

Water and Oil

High - temperatureand Moisture

Dust
Power supply

Power supply

Corrosive Gas
Coughing

Vibration

If stored for more than 2 years, products using aluminum electrolytic capacitors should be run for at least 1 hour.
If stored in moisture proof bags, products should be stored in environments at 5-30℃, 60%RH and be used within 1
year, or otherwise be re-sealed.
Surface treated steel plating is used for some products and optional attachments. Thought the surface is plated, the end
surface will be exposed after processing. Discoloration or oxidation may occur due to product storage conditions or placement, but this will not affect product performance or reliability. If this is a concern and protection of the end surface isrequired, please contact us.

12

7. Handling Of Rugged PCB Unit
Handling instruction of rugged PCB power supplies is different from that of unit type(with chassis) power
supplies. Please keep in mind the following in handling the PCB type.

(1) After the load test
There remains high voltage inside the power supply
after the load test or Hi-Pot test are performed. Therefore, if the power supply is put on the metal plate, it may
cause short condition due to exposing solder part, and it
will degrade the unit or cause an electric shock.

Power supply

Oh!

Metal Plate(2) Mechanical stress
When assembling the power supply on the table, avoid mechanical stress to the parts or solder joints. The power supply
will be damaged by the stress.

Twisting
Loosened screw

No

No

No

(3) Notes when maintenanceAt light load, there remains high voltage inside thepower supply for several minutes after switch OFF. When
maintenance is performed, pay special attention toelectric shock.
Power supply
OFF(4) Insulation distance
When setting the power supply on metal chassis, keep the insulation distance between the lead of parts and metal chassis.
The insulation distance is specified at each relative page of the unit. If the distance is not enough, it is preferable to keep the
distance by inserting insulation sheet between the power supply and metal chassis.

More thanregular size

Less thanregular size

13

Insulation sheet