TDK-Lambda GWS250 Series User manual

TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
GWS250 Series
Instruction Manual
BEFORE USING THE POWER SUPPLY UNIT
Pay attention to all warnings and cautions before using the unit. Incorrect usage could lead to an electrical
shock, damage to the unit or a fire hazard.
WARNING and CAUTION
zDo not modify.
zDo not touch the internal components, they may have high voltage or high temperature. You may get
electrical shock or burned.
zWhen the unit is operating, keep your hands and face away from it as you may be injured by flying debris in
the event of a fault.
zThis power supply is designed for use within an end product. Stick the WARNING label for users on the
system equipment and notify in the system instruction manual.
zNever operate the unit under over current or short-circuit conditions for more than 30 seconds or outside its
specified Input Voltage Range, which could result in damage. There is no possibility of fire or burning.
zConfirm connections to input/output terminals are correct as indicated in the instruction manual.
zThis power supply has a possibility for hazardous voltage to appear at output terminal depending on the type
of failure. The outputs of these products must be earthed in the end equipment to maintain SELV.
If the outputs are not earthed, they must be considered hazardous and must not be made user accessible.
Note: CE MARKING
CE marking, when applied to the GWS series products, indicates compliance with the Low Voltage Directive
(2006/95/EC) in that it complies with EN60950-1 2nd Edition.
DWG NO. : PA589-04-01B
APPD CHK DWG

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
1. Model name identification method
GWS 250 – 12 /
2. Terminal Explanation
2-1. Front Panel Explanation
(1) L : Input terminal Live line (Fuse in line)
(2) N : Input terminal Neutral line
(3) FG
: Frame Ground
(4) - V : - Output terminal
(5) +V : + Output terminal
(6) Output monitoring indicator (Green LED : ON)
(7) V.ADJ : Output voltage adjustable trimmer
(The output voltage rises when the trimmer is turned clockwise.)
(8) CN1: DC_OK, 5VSB, Remote On/Off and PV signals (Refer to 2.2)
(*1)
blank: Standard type
/P: Power up to 350W with system airflow of
20cfm minimum and air blowing in from
opposite side of input/output connectors
/BAT: Battery charging for 24V (21~29V/8.8A)
& 48V (42~58V/4.4A) only
/T: OTP autorecovery after unit cools down
/RL: Remote ON/OFF reverse logic (Active High)
Option (*1)
Rated Output Voltage
Output Power type
Series name

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
2-2. CN1 Connector Pin Configuration and Function
Pin
No.
Configuration Function
1 DC_OK DC_OK signal is an open collector output signal, ref-
erenced to pin2 (COM). As the output voltage drops,
DC_OK signal will output “High”.
2 COM Return loop for DC_OK signal.
3 5VSB Auxiliary voltage output, 4.75~5.25V, referenced to
pin4 (COM). The maximum load current is 0.3A. This
output is not controlled by the remote ON/OFF control.
4 COM Return loop for 5VSB signal.
5 CNT+ Remote ON/OFF control terminal
(When CNT+ is pulled to TTL low, power supply unit
turns ON. Otherwise, it turns OFF)
6 CNT- Return loop for CNT+ signal
7 PV Output voltage external control terminal
8 COM Return loop for PV signal.
CN1 Connector, Housing and Terminal Pins
PART DESCRIPTION PART NAME MANUFACTURER
PIN HEADER S8B-PHDSS(LF)(SN) JST
SOCKET HOUSING PHDR-8VS JST
TERMINAL PINS SPHD-001T-P0.5 OR SPHD-002T-P0.5 JST
HAND CRIMPING TOOL
YRS-620 (SPHD-002T-P0.5) OR
YC-610R (SPHD-001T-P0.5)
Hand Crimp Tool for Milli-Grid
and
MicroBlade Crimp Terminals
JST

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
3. Terminal Connection Method
Please pay extra attention to the wiring. Incorrect connection may cause damage the power supply.
zWhen connecting input and output wiring, and CN1, input AC-Line should be OFF.
zThe output load line and input line shall be separated and twisted to improve noise immunity.
zConnect FG terminal to ground terminal of the equipment.
zRemote ON/OFF control lines shall be twisted or use shielded wire.
zOutput current for each terminal screw shall be less than 30A.
GWS250
zBasic Connection
Connect “CNT+” terminal to “CNT-“ terminal
with the attached connector.
zON/OFF control required
“CNT-“ terminal is ground for “CNT+” terminal.
zDC_OK output signal required
Open collector method shown below shall be used
“COM“ terminal is ground for “DC_OK” terminal.
zPV control required
Inject external voltage between 3~6V
“COM“ terminal is ground for “PV” terminal.

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
4. Explanation of Functions and Precautions
4-1. Input Voltage Range
Input voltage range is single phase 85 ~ 264VAC (47 ~ 63Hz) or 125 ~ 373VDC.
Input voltage which is out of specification, may damage the unit. For cases where conformance to various
safety specs(UL,CSA,EN) are required, input voltage range will be 100~240VAC (50/60Hz ).
Note : GWS250 series is able to withstand Input Surge of 300VAC for 5 seconds.
4-2. Output Voltage Range
V.ADJ trimmer is for output voltage adjustment within the range of specifications. Turning the trimmer clockwise will
increase the output voltage. Kindly note that over voltage protection ( OVP ) function may trigger if the output voltage
is increased excessively. Please ensure that the output power is below the rated output power, and output current is
below the maximum output current (12V & 48V) or below the peak output current (24V & 36V) when output voltage is
raised.
4-3. Over Voltage Protection (OVP)
The OVP function will shutdown the output. To reset OVP, remove the input of power supply for a few minutes, and
then re-input. Alternatively, use CNT reset (Remote ON/OFF: OFF to ON). OVP setting is fixed and cannot be adjusted
externally.
4-4. Over Current Protection (OCP)
OCP function operates when the output current exceeds OCP specifications. OCP characteristic is constant current
limiting for 24V ~ 48V while 12V has hiccup mode. The output will automatically recover when the overload condition
is removed. Do not operate overload or dead short conditions for more than 30 seconds, which could result in damage.
There is no possibility of fire or burning. OCP setting is fixed and not to be adjusted externally.
4-5. Over Temperature Protection (OTP)
Over Temperature Protection function (manual reset type) is available. When ambient or internal temperature rises
abnormally, OTP function will shut down the output. To recover the unit, first shut down the AC input and let the unit
cool down before turning ON the AC input. Alternatively, use CNT reset (Remote ON/OFF: OFF to ON) after letting
the unit cool down.
As for the /T option model, the unit automatically recovers after it cools down without the need for AC recycle or CNT
reset.

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
4-6. Low Output Detection Circuit (DC_OK)
Low output voltage detection circuit is provided. DC okay (DC_OK) signal will turn “High” level to indicate abnormal
status when the output voltage becomes less than approximately 80% of rated value caused by either the drop or
brownout of the input voltage or OCP, OVP and OTP function generation. It uses the open collector method as shown
below
4-7. Remote ON/OFF Control
Remote ON/OFF control is provided.
Using this function, output on/off is allowed to be controlled without input voltage on/off. The output is turned ON
when CNT+ and CNT- terminals are shorted, while the output is turned OFF when these terminals are opened. When
this function is not used, connect CNT+ and CNT- terminals together. The standards for this function are as follows
(1) TTL compatible.
(2) The maximum input voltage to CNT+ terminal is 12V, and the maximum allowable reverse voltage is -1V.
(3) The sink current for CNT+ terminal is 3.5mA.
(4) A switch or a relay or a transistor or a FET can be used as ON/OFF switch.
The /RL option model reverses the logic of the remote ON/OFF function.
Output Status
Voltage Range between CNT+ and CNT- Standard type /RL option
2.4 ≤H ≤12.0V or Open OFF ON
0.0 ≤L ≤0.8V or Short ON OFF
Relay, Transistor,
FET, Switch

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
4-8. Output Ripple & Noise
Ripple & noise are measured at 20MHz by using a 300mm twisted pair of load wires terminated with a 0.1uF film
capacitor & 47uF electrolytic capacitor. When load lines are longer, ripple becomes larger. The output ripple cannot be
measured accurately if the probe ground lead of oscilloscope is too long. At low temperature, large ripple & noise may
also be observed due to large ESR of the internal Electrolytic Capacitors especially at -25°C.
4-9. Series Operation
For series operation, either method ( A ) or ( B ) is possible.
Method(A) Method(B)
Output
Terminal
Output
Terminal
Load
Power
Supply
Power
Supply
Load
Load
Output
Terminal
Output
Terminal
Note : In case of Method ( A ), please connect diodes to prevent the reverse voltage.
4-10. Parallel Operation
(A) Operation to increase the Output Current is not possible.
(B) Operation as a Backup Power Supply is possible as follows.
1. Set the power supply output voltage higher by the amount of forward voltage drop ( VF) of the diode.
2. Please adjust the output voltage of each power supply to be the same.
3. Please use within the specifications for output voltage and output current.
(A) (B)
Load
Output
Terminal
Output
Terminal
Power
Supply
Out put
Terminal
Out put
Terminal
Loa
d
Power
Supply

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
4-11. Output Voltage External Control (PV)
Output voltage external control function is available. Output voltage can be varied by applying an external voltage
(3–6V) to “PV” terminal and “COM” terminal. Please consider the following characteristics.
Note:
For 12V & 36V output model, limit output voltage variation range at 60% ~ 110%. At PV voltage variation 3V ~ 5.5V.
For 24V output model, limit output voltage variation range at 60% ~ 120%. At PV voltage variation 3V ~ 6V.
For 48V output model, limit output voltage variation range at 80% ~ 120%. At PV voltage variation 4V ~ 6V.
Connection method
PV voltage (Nominal Input Voltage)
Output Voltage Linearity
5.5V
6V5V
Nominal
Vout
0
60%
3V
110%
120%
Output Voltage
80%
4V
24 & 48V Model
48V Model
12~36V Model
12 & 36V Model
Output Voltage Derating
100%83%
Nominal
Vout
0
110%
120%
90%
Load Current
Output Voltage
80%
60%
24 & 48V Model
48V Model
12~36V Model
12 & 36V Model

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
4-12. Battery Charging (/BAT) option
An option model for battery charging operation is available. It comes in two output voltages namely; 24V & 48V
with ex-factory setting of 29V & 58V respectively.
However, in conjunction with the Vadj and PV functions, the output voltage can be set to the range shown on the
charts below.
Connection method

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
4-13. Output Peak Power
Operating conditions for peak power/current models:
(a) Reduce peak current according to output derating curve for higher ambient temperature
(see section 5.1)
(b) Output might shut down when the rated current or the continuous peak output time (τ)
exceeded rated value specified. Power supply may shut down and operate in hiccup or
constant current limiting mode.
Input voltage : 115 ~ 230 VAC +/- 20% (50/60 Hz)
Continuous peak out time (τ) : < 10s
Peak output current (Ip) : Within the rated peak output current
Duty: not more than 35%
τ
Duty = ---- x 100 (%)
T
τ
Ip
2x ---- < Irms max
T
Applicable model for Peak Output Power :
Model Irms max.
GWS250-24 7.40 A
GWS250-36 4.97 A
4-14. Auxiliary Supply
Auxiliary supply (5V, 0.3A max) is provided to ease customer application. Aux voltage is always available as long as
input power in the specified voltage range is present.

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
5. Isolation / Withstand Voltage
5-1. Isolation Test
Isolation resistance between output and FG (chassis) shall be more than 100MΩat 500VDC. For safety, voltage setting
of DC isolation tester must be done before the test. Ensure that the unit is fully discharged after the test.
(a) Output ~ FG (chassis) : 500VDC, 100MΩor more
5-2. Withstand Voltage
This series is designed to withstand 3.0kVAC between input and output, 1.5kVAC between input and FG (chassis) and
500VAC between output and FG (chassis) each for 1 minute. When testing withstand voltage, set current limit of with-
stand voltage test equipment at 20mA ( Output-FG (chassis) : 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 power supply may be
damaged by high impulse voltage at timer switch on and off. Connect input and output as follows :
(a) Input ~ FG (chassis) : solid line (c) Output ~ FG (chassis) : 500VAC, 1min (100mA)
1.5kVAC, 1min (20mA)
(b) Input ~ Output : dotted line
3kVAC, 1min ( 20mA )

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
6. Mounting Directions
6-1. Output Derating according to the Mounting Directions
(a) Convection cooling, without external airflow (Standard type)
Recommended standard mounting is Method ( A ).
Methods ( B ), ( C ) and ( D ) are also possible.
Refer to the Output Derating below.
Please do not use installation Method ( E ), where the PCB will be on the topside and heat will be trapped inside the unit.

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
(b) Forced air cooling, (/P option)
External airflow of at least 20cfm and air blowing in from the opposite side of the input/output connectors.
Recommended standard mounting is Method ( A ).
Method ( B ) is also possible.
Refer to the Output Derating below.
Please do not use installation Methods ( C ), ( D ) and ( E ).

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
6-2. Output Derating according to ambient temperature and input voltage
(A) GWS250 series Output Derating versus Ambient Temperature
The system is convection cooling.
In the following derating curve, the maximum output current is denoted as 100%.
Output Derating versus Ambient Temperature (Convection Cooling)
(B) GWS250 series Output Derating versus Input Voltage

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
The system is convection cooling.
In the following derating curve, the maximum output current is denoted as 100%.
Output Derating versus Input Voltage (Convection Cooling)
Output Derating Vs Input Voltage
0
20
40
60
80
100
120
85 264
Vin (Vac)
Mounting
A
Mounting
B, C & D
Load (%)
90
100 230

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
(C) GWS250/P series Output Derating versus Ambient Temperature
The system is forced air cooling with external airflow of at least 20cfm and air blowing in from the opposite side of the
input/output connectors.
In the following derating curve, the maximum output current is denoted as 100%.
Output Derating versus Ambient Temperature (Forced Air Cooling)
Output Derating Vs Ambient Temperature
0
20
40
60
80
100
120
-25 0 25 50 75 100
Ambient Temperature (
o
C)
Mounting
A & B
Load (%)
70
70
Airflow
(≥20 cfm)

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
The Output Derating with external fan depends on the airflow conditions and the temperature rise for the components.
The method stipulated below provide a way to decide for the safe operation of this power supply. As shown, this table
provides a list of the maximum temperature allowed for specified components. The component temperature is measured
according to IEC60950-1 2nd edition Clause 4.5.
Maximum rated temperature for these components are taken from the component specification provided by the original
manufacturers. These are the worse case allowable temperature.
Temperature is measured using thermal couple K-type, and using CYANOACRYLATE adhesive or equivalent to secure
to the hottest point of these components.
In order to decide the worse case temperature rise, the selected measurement point should not face direct airflow and the
equipment powered should operate under worse case operating conditions.
*1. Absolute temperature (Maximum temperature) during normal operating conditions.
Higher temperature will probably cause shorter life span for the power supply.
Please refer to the component side layout drawing below for temperature measurement.
Airflow should cool down all the components evenly.
Location No Parts Name Maximum Temperature (oC) *1
D1 Bridge Diode 100 (130)
D18/Q11 Schottky Diode/Mosfet 85 (130)
C14 Electrolytic Capacitor 60 (105)
T1 Transformer 95 (130)

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
6-3 Mounting Method
1) This is convection cooling type power supply. In consideration of the heat radiation and safety, please keep a dis-
tance of more than 15mm between the power supply and the peripheral parts. When lining up multiple units, please
make sure to place them 5mm or more apart from each other.
2) Maximum allowable penetration of mounting screws into the power-supply is 5mm.
3) Recommended torque for mounting screws (M4): 1.27 N⋅m (13.0 kgf⋅cm).

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
7. Wiring Method
zThe input and output load wires shall be separated and twisted to improve noise immunity.
zBoth wires must be as thick and short as possible to have lower impedance.
zNoise can be reduced by connecting a film capacitor with 0.1uF capacitance across the load terminals.
zFor safety and EMI considerations, connect the FG terminal of GWS250 series to mounting set ground
terminal.
zThe recommended wire type :
Recommended crimp-type terminal
MODEL Recommended
Wire
Recommended torque
D
(MAX)
t
(MAX)
Mounting
Pieces
(MAX)
GWS250 AWG14-22
M3.5 Screws
1.0 N⋅m (9.8 kgf⋅cm) ~
1.4 N⋅m (13.7 kgf⋅cm)
6.8mm 0.8mm 2 pieces
Note 1 : When using separate loads, it is recommended to use 2 pieces of 0.8mm thick crimp-type terminal.
Note 2 : For recommended wire diameter, refer to wire maker recommended allowable current and voltage
drop. For higher output current model like 12V, bigger diameter wire is recommended.
8. External Fuse Rating
Refer to the following fuse rating when selecting the external input fuse. Surge current flows when input turns on.
Fuse rating is specified by Inrush Current value at input turn on. Do not select the fuse according to input current (rms)
values under the actual load condition.
GWS250 : F6.3AH , 250V

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TDK-Lambda
GWS 250 Series
INSTRUCTION MANUAL
9. Before concluding that the unit is at fault...
Please make the following checks.
(1) Check if the rated input voltage is connected and within specification.
(2) Check if the wiring of input and output is correct.
(3) Check if the I/O terminal connection is properly tighten by required torque.
(4) Check if the wire thickness is enough.
(5) Check if the output voltage trimmer (V.ADJ) is properly adjusted. OVP might be triggered and output is
shutdown.
(6) Is the chassis of power supply abnormally hot? The output is shutdown by OTP operation.
Please disconnect or turn off the AC input and let the unit cool down sufficiently before turning ON the AC
input again.
(7) Check if the output current and output wattage does not exceed the specification.
(8) Audible noise may be heard when input voltage waveform is not sinusoidal.
(9) Audible noise may be heard during dynamic load operation.
(10) Ensure that a large capacitor is not connected across the output terminals. Please use within maximum ca-
pacitance shown below.
Maximum external capacitance
MODEL 12V 24V 36V 48V
GWS250 10,000uF 5,000uF 1,000uF
10. Warranty Condition
This product is under warranty for 5 years (based on 24 hours/day operation) from the date of shipment. During the
warranty period, TDK-Lambda will, at it’s option, either repair or replace products prove to be defective.
Warranty applies but not limited to the following.
(1) Average operating temperature (ambient temperature of the power supply unit) is under 40oC.
(2) Average load factor is 80% or less.
(3) Installation method : Standard installation.
Following cases are not covered by warranty.
(1) Improper usage and mis-handling like dropping or applying shock to the unit and defects from operation
exceeding specification of the product.
(2) Defects resulting from natural disaster (fire, flood).
(3) Unauthorized modification or repair.