B40-1F30-FKB datasheet(9/20 Pages) MAGNETROL

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4.0

Reference Information

4.1

Troubleshooting

Usually the first indication of improper operation is failure

of the controlled equipment to function, i.e., pump will not

start (or stop), signal lamps 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.

e. Wiring leading to control may be defective.

If a thorough inspection of these possible conditions fails to

locate the trouble, proceed next to a check of the control's

switch mechanism.

4.1.1 Check switch mechanism

1. Pull disconnect switch or otherwise disconnect power to

the control.

2. Remove switch housing cover.

3. Disconnect power wiring from switch assembly.

4. Swing magnet assembly in and out by hand to check carefully

for any sign of binding. Assembly should require minimal

force to move it through its full swing.

5. If binding exists, magnet may be rubbing enclosing tube.

If magnet is rubbing, loosen magnet clamp screw and shift

magnet position. Retighten magnet clamp screw.

6. 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 spirit level on side of enclosing tube in two places,

90° apart.) Refer to Figure 3 on page 5.

7. If mechanism is equipped with a mercury switch, examine

glass mercury tube closely as previously described in

Section 3.0 Preventive Maintenance (page 7). If switch is

damaged, replace it immediately. If microswitch, check

continuity with ohmmeter.

8. If switch mechanism is operating satisfactorily, consult

factory.

46-602 B40 Liquid Level Switches

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