TDK-Lambda GWS250 Series, GWS250-24, GWS250-36 Instruction 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

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

electrical shock or burned.

z 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.

z 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.

z 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.

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

nd

Edition.

DWG NO. : PA589-04-01B

APPD CHK DWG

TDK-Lambda

GWS 250 Series
INSTRUCTION MANUAL

1. Model name identification method

(*1)

GWS 250 – 12 /

Option (*1)

Rated Output Voltage

Output Power type

Series name

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)

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
(4) - V : - Output terminal
(5) +V : + Output terminal
(6) Output monitoring indicator (Green LED : ON)
(7) V.ADJ : Output voltage adjustable trimmer

(8) CN1: DC_OK, 5VSB, Remote On/Off and PV signals (Refer to 2.2)

: Frame Ground

(The output voltage rises when the trimmer is turned clockwise.)

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TDK-Lambda

GWS 250 Series
INSTRUCTION MANUAL

2-2. CN1 Connector Pin Configuration and Function

Pin

Configuration Function
No.
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

4 COM Return loop for 5VSB signal.
5 CNT+ Remote ON/OFF control terminal

6 CNT- Return loop for CNT+ signal
7 PV Output voltage external control terminal
8 COM Return loop for PV signal.

output is not controlled by the remote ON/OFF control.

(When CNT+ is pulled to TTL low, power supply unit

turns ON. Otherwise, it turns OFF)

CN1 Connector, Housing and Terminal Pins

PART DESCRIPTION PART NAME MANUFACTURER

PIN HEADER S8B-PHDSS(LF)(SN) JST
SOCKET HOUSING PHDR-8VS JST

SPHD-001T-P0.5 OR

TERMINAL PINS

HAND CRIMPING TOOL

SPHD-002T-P0.5 JST
YRS-620 (SPH D- 00 2T -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.

z When connecting input and output wiring, and CN1, input AC-Line should be OFF.
z The output load line and input line shall be separated and twisted to improve noise immunity.
z Connect FG terminal to ground terminal of the equipment.
z Remote ON/OFF control lines shall be twisted or use shielded wire.
z Output current for each terminal screw shall be less than 30A.

GWS250

z Basic Connection

Connect “CNT+” terminal to “CNT-“ terminal
with the attached connector.

z DC_OK output signal required

Open collector method shown below shall be used
“COM“ terminal is ground for “DC_OK” terminal.

z ON/OFF control required

“CNT-“ terminal is ground for “CNT+” terminal.

z PV 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.

Voltage Range between CNT+ and CNT-

2.4 ≤ H ≤ 12.0V or Open OFF ON

0.0 ≤ L ≤ 0.8V or Short ON OFF

Relay, Transistor,
FET, Switch

Standard type /RL option

Output Status

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