Belshaw Adamatic FT42 Feed Table - Manual (Page 22)

Belshaw Bros., Inc. • www.belshaw.com • Phone 206-322-5474 • Fax 206-322-5425
8 MN-1668EN Feed table FT42 TS
Testing the Continuity of a
Microswitch
WARNING
To avoid the possibility of electric shock,
disconnect the machine from the power
source before testing.
1. Disconnect the machine from the power
supply.
2. Disconnect the terminal wires from the
switch.
3. Obtain a continuity tester or a volt-ohm
meter. If neither of these instruments is
available, make a continuity tester using a
battery and a bulb. (See Figure 4-2.)
4. Connect one wire of the continuity tester to
the microswitch’s common (COM) terminal
and the other wire to the normally open
(NO) terminal, as shown in Figure 4-2. The
switch should show continuity only when
the microswitch actuator arm is depressed.
5. To test the normally closed (NC) terminal,
move the wire from the normally open (NO)
terminal to the normally closed terminal.
Now the switch should show continuity only
when the actuator arm is not depressed.
Figure 4-2. Microswitch Continuity Test.
NC NO
COM
switch
terminals
microswitch
+
battery
−