12
47-602 F10 and F50 Flow Switches
4.0
Reference Information
4.1
Troubleshooting
Usually the first indication of improper operation is fail-
ure of the controlled equipment to function, i.e., pump
will not start (or stop), signal lights fail to light, etc. When
these symptoms occur, whether at time of installation or
during routine service thereafter, check the following
potential external causes first.
a. Fuses may be blown.
b. Reset button(s) may need resetting.
c. Power switch may be open.
d. Controlled equipment may be faulty.
If a thorough inspection of these possible conditions fails
to locate the trouble, proceed to a check of the control's
switch mechanism.
4.1.1 Check Switch Mechanism
1. Pull disconnect switch, or otherwise assure that electrical
circuit(s) of control are deactivated.
2. Remove switch housing cover.
3. Swing magnet assembly in and out by hand, checking
carefully for any sign of binding. Assembly should require
minimal force to move it through its full swing.
4. If binding exists, magnet may be rubbing enclosing tube.
If magnet is rubbing, loosen magnet clamp screw, and shift
magnet position.
5. If switch magnet assembly swings freely, and mechanism
still fails to actuate, check installation of control to be
certain it is within the specified three degrees of vertical.
Use a spirit level on side of enclosing tube in two places,
90 degrees apart.
NOTE: As a matter of good practice, spare switches should be kept
on hand at all times.
If switch mechanism is operating satisfactorily, a test of the
complete control’s performance is the next likely step.
