-21-
TDK-Lambda
HWS1000/ME Series
INSTRUCTION MANUAL
(8) M4 screw for output terminal might damage the terminal’s inner thread. This is mainly cause by the M4 screw’s
unthread section. Therefore, please select a washer, spring washer, etc. to avoid unthread screw section from
penetrating into output terminal inner section.
8. External Fuse Rating
Refer to the following fuse rating when selecting the external fuses for input line. Surge current flows when line turns
on. Use slow-blow fuse or time-lug fuse. Do not use fast-blow fuse. Fuse rating is specified 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.
HWS1000
：
20A
9. Troubleshooting
Before concluding that the unit is at fault, make the following checks.
(1) Check if the rated input voltage is apply.
(2) Check if the wiring of input and output is correct.
(3) Check if the I/O terminal connection is properly tighten by a regulated tightening torque.
(4) Check if the wire material is not too thin.
(5) Check if the output voltage control (V.ADJ) is properly adjusted. OVP might be triggered and output is cut off.
(6) Check if the wiring of “+S” and “-S” terminal is correct. If in open condition, the stability and the accuracy of
the output deteriorate.
(7) If use function of the remote ON/OFF control, check if the remote ON/OFF control connector is not opened.
If in open condition, output is cut off.
(8) Check if the built-in fan is not stopped. Is fan stopped by something irregulars or dust, etc.
If fan stops, the PF signal is turn on.
Moreover, the output is intercepted with the protection circuit if fan stops.
Fans are the limited life parts.
This power supply has ventilating holes on the front and back panels. Check if there is any irregulars or dust, etc.
(9) Is the main body of the power supply abnormally hot?
Please turn on the input again after allowing the unit to cool down sufficiently. The output shut down by over
temperature protection function.
(10) Check if the output current and output power is not applied over specification.
(11) Check if the input voltage wave is sinusoidal. If this power supply unit is connected to a UPS, input voltage wave
might not be sinusoidal. An audible noise is emitted from the power supply unit.
(12) Audible noise can be heard during Dynamic-Load operation.
Unthread section
Output terminal
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