-8-
TDK-Lambda
RDS Series (110VDC Input)
Instruction Manual
7-3. Precaution for Unit Mounting
(1) The basic cooling method is Natural Convection. Keep a space more than 15mm each around RDS unit to avoid hot air from
accumulating. And same application is also needed when using multiple RDS units. Please apply wind direction along the fin
of RDS unit when using by Air-Forced cooling.
(2) Connect Protective Earth Terminal ( ) to the Ground of the application equipment. Otherwise, noise * will get worse.
( * Input conducted emission noise, Radiated Emission noise, or Output noise )
(3) Insert stroke length of a fixing screw is less than 7mm. Avoid inserting failed screw.
(4) Recommended fastening torque for fixing
M3 type screw : 0.51N
・
m (5.2 kgf
・
cm)
M4 type screw : 1.27 N
・
m (13.0 kgf
・
cm)
8. Wiring Method
(1) Separate wire for input & output (load) line. Further, by twisting wire for each input & output to improve switching noise.
(2) Use short length and thick wires for input & output line in order to lower down line impedance
(3) Switching noise will decrease by adding capacitor to load terminal.
(4) Connect protective earth terminal ( ) to ground of the equipment by using thick wires.
9. External Fuse Rating
Please refer to the following fuse rating when selecting the external fuses that are to be used on input line. Surge current flows when line
turns on. Fuse rating is considered by in-rush current value at line turn-on. Do not select the fuse according to input average current
values under the actual load condition. RDS unit has same rating fuse inside (+Vin Line).
RDS50 -110
：
F3.2AL
10. Before Thinking that the Unit is Failure
(1)
Check if the rated input voltage is applied.
(2)
Check if the wiring of input or output line is correct.
(3)
Check if the terminal screw is fastened with specified torque certainly.
(4)
Check if the wire thickness is enough.
(5)
Check if the output current and output power does not exceed specification.
(6)
Check if the output voltage setting (V.ADJ) is properly adjusted. OVP might be triggered and output will shut down.
(7)
Check if sensing wire opened or not. OVP might be triggered and output will shut down.
(8)
Check if remote ON/OFF (CNT/TOG) terminal is opened or not. Output turns off if the terminal is opened.
(9)
Audible noise can be heard depending on frequency or current change rate condition during Dynamic-Load operation.
11. Warranty Period
Warranty period is 5 years. Free of charge repair is available for the damage under normal usage during warranty period.
Free of charge warranty covers following condition.
(1) Average ambient temperature is less than 40
o
C.
(2) Average load is less than 80% rate of nominal output power.
(3) Mounting method is (A), standard mounting.
Following cases are not covered by warranty.
(1) Improper usage like dropping products, applying shock, improper handling and operation exceeding maximum specification of the units.
(2) Defects resulting from natural disaster (fire, flood etc).
(3) Defects resulting from modifications or repair done by unauthorized or uncertified personnel by TDK-Lambda.
