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C-5
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Technical Guide for Pushbutton Switches
Mounting Precautions
Wiring
•
Perform wiring so that the lead wires will not be caught on other objects
as this will cause stress on the Switch terminals. Wire the Switch so
that there is slack in the lead wires and fix lead wires at intermediate
points. If the panel to which the Switch is mounted needs to be opened
and closed for maintenance purposes, perform wiring so that the
opening and closing of the panel will not interfere with the wiring.
•
With miniature Switches, the gap between the terminals is very
narrow. Use protective or heat-absorbing tubes to prevent burning
of the wire sheath or shorting.
Soldering
•
There are two methods for soldering the Switch: hand soldering and
automatic soldering. In addition, automatic soldering itself can be
divided into two types : dip soldering and reflow soldering. Use the
soldering method appropriate for the mounting method.
Typical Soldering Example
•
Do not use soldering flux that contains chlorine. Doing so may
result in metal corrosion.
•
Perform hand soldering using the appropriate soldering iron.
•
With the exception of PCB-mounting Switches, when performing
hand soldering, hold the Switch so that the terminals point
downwards so that flux does not get inside the Switch.
•
Leave a gap of at least 1 mm between the soldered parts and the
surface of the case so that flux does not get inside the Switch.
•
When applying flux using a brush, use a sponge soaked in flux as
shown below. Do not apply more than is necessary. Also, apply the
flux with the PCB inclined at an angle of less than 80
°
so that flux
does not flow onto the mounting surface of the Switch.
Method
Soldering device
Application
Hand soldering
Soldering iron
Small quantities
Different materials
Lead wire terminals
Automatic
soldering
Dip
soldering
Jet soldering bath
Dip soldering bath
Large quantities of
discrete terminals
Reflow
soldering
Infrared reflow (IR)
soldering bath
Vapor-phase (VPS)
reflow soldering bath
Large quantities
of miniature SMD
terminals
Protective tube
l
Termina
Lead wire
Large-capacity
soldering iron
Small-capacity
soldering iron
used for a long
time
Perform soldering for
between 3 to 5 s with
a suitable soldering iron.
Case
Terminal
Solder
1 mm min.
Lead wire
Flux
Sponge
soaked in flux
Brush
Brush
80
°
max.
