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MSSM0116AE/8809BV (1 of 2)
ÈSETTING LIMIT SWITCHES
ÊLimit Switches—Including Microswitches—
Will Be Damaged If Over-actuated!
Any limit switch will be damaged if it bottoms out forcefully. This can bend the rotary shaft or damage
internal components and may cause the switch to stick in one position either permanently or intermittently. Be
aware that an intermittently sticking switch can be mistaken for a malfunctioning microprocessor!
Limit switches must function properly to ensure the safe operation of the machine.
☞ Inspect switches regularly.
☞ Never operate a machine with a malfunctioning limit switch.
ÊSetting Switches
ËTravel of Rotary Lever or Plunger
—Set switch and target so that after the switch contacts close (as de-
termined by an ohmmeter), the lever or plunger will then move approximately half of its additional available travel
(see FIGURE 2).
NOTE: It is impossible to determine by feel, sound, or experience at what point the switch contacts make.
The only reliable method is to use an ohmmeter. Switches may also be bench-tested, and the plunger or
rotary shaft scribed to mark this point.
FIGURE 1a
Rotary Lever Switch
FIGURE 1b
Plunger Switch
FIGURE 1c
180° Roller
Plunger
FIGURE 1d
90° Roller Plunger
Switch
FIGURE 2a
Rotary Lever
FIGURE 2b
Plunger Switches
(Roller Plunger Switch Shown)
ÎFIGURE 1
(MSSM0116AE)
ÎLimit Switch Types
ÎFIGURE 2
(MSSM0116AE)
ÎWhere Lever or Plunger Should Stop
B
B
B
2