Instructions

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TDK-Lambda

GWS 2

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

 Do not modify.

 Do not touch the internal components, they may have high voltage or high temperature. You may get

electrical shock or burned.

 When 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.

 This 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.

 Never 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.

 Confirm connections to input/output terminals are correct as indicated in the instruction manual.

 This 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 2

Edition

DWG NO. : PA589-04-01B

APPD CHK DWG

Summary of content (20 pages)

PAGE 1
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 Do not modify. Do not touch the internal components, they may have high voltage or high temperature. You may get electrical shock or burned.
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TDK-Lambda GWS 250 Series INSTRUCTION MANUAL 1. Model name identification method (*1) GWS 250 – 12 / blank: /P: Option (*1) Rated Output Voltage Output Power type /BAT: Series name /T: /RL: Standard type Power up to 350W with system airflow of 20cfm minimum and air blowing in from opposite side of input/output connectors Battery charging for 24V (21~29V/8.8A) & 48V (42~58V/4.4A) only OTP autorecovery after unit cools down Remote ON/OFF reverse logic (Active High) 2. Terminal Explanation 2-1.
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TDK-Lambda GWS 250 Series INSTRUCTION MANUAL 2-2. CN1 Connector Pin Configuration and Function Pin Configuration No. 1 DC_OK 2 3 COM 5VSB 4 5 COM CNT+ 6 7 8 CNTPV COM Function DC_OK signal is an open collector output signal, referenced to pin2 (COM). As the output voltage drops, DC_OK signal will output “High”. Return loop for DC_OK signal. 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.
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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. When connecting input and output wiring, and CN1, input AC-Line should be OFF. The output load line and input line shall be separated and twisted to improve noise immunity. Connect FG terminal to ground terminal of the equipment. Remote ON/OFF control lines shall be twisted or use shielded wire.
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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.
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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.
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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.
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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.
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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.
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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.
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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 100MΩ at 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, 100MΩ or more 5-2. Withstand Voltage This series is designed to withstand 3.0kVAC between input and output, 1.
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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%.
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TDK-Lambda GWS 250 Series INSTRUCTION MANUAL (B) GWS250 series Output Derating versus Input Voltage The system is convection cooling. In the following derating curve, the maximum output current is denoted as 100%.
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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. Airflow (≥ 20 cfm) In the following derating curve, the maximum output current is denoted as 100%.
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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.
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TDK-Lambda GWS 250 Series INSTRUCTION MANUAL 6-3 Mounting Method 1) 2) 3) This is convection cooling type power supply. In consideration of the heat radiation and safety, please keep a distance 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. Maximum allowable penetration of mounting screws into the power-supply is 5mm. 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 The input and output load wires shall be separated and twisted to improve noise immunity. Both wires must be as thick and short as possible to have lower impedance. Noise can be reduced by connecting a film capacitor with 0.1uF capacitance across the load terminals. For safety and EMI considerations, connect the FG terminal of GWS250 series to mounting set ground terminal.
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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.