5
Pump
Servicing
5. On single phase (1ø) units,
check capacitor (#28) using
ohmmeter. With ohmmeter
scale set at R x 1000, attach
meter leads to capacitor. The
meter needle should go to zero
and come back slowly. If it
does not, the capacitor should
be replaced.
6. To check motor stator, remove
power cord leads from
terminal bushings on top of
motor (1ø only; 3ø remove
wire nuts). If stator is visibly
burned, motor assembly must
be replaced.
7.
Ground check
on stator should
be performed using ohmmeter
with scale set at R x 100 and
checking meter by putting
both meter leads together and
adjusting the needle knob until
meter reads zero. If meter
cannot be adjusted to zero, it
will indicate that batteries in
meter must be replaced.
Always make this test with the
meter when scale pointer is set
to a new scale before making
any checks on the motor.
Now connect one meter lead
to one terminal of stator and
touch and other meter lead to
motor stator shell. If needle on
ohmmeter goes completely to
zero, the motor probably has
a wire touching the stator
at some point and the motor
assembly will have to
be replaced.
8.
Winding resistance test
should
be performed if the ground test
is satisfactory. Use ohmmeter
with scale pointer set on R x 1
scale. On this scale, meter
reads directly on ohms.
Always check the meter with
leads together as described
above under Ground Check
test before making a reading of
the winding.
Connect one motor lead to the
white wire terminal and the
other meter lead to the black
wire terminal. This reading is
for the main winding. If the
readings obtained do not agree
with those given below, the
stator is defective and the motor
assembly must be replaced.
Reconnect the wires as they
were removed.
9. For three phase pumps, remove
the power cord assembly (#22)
by cutting the butt connection
and wire nuts (#32) and
remove the power cord from
the pump.
10.Twist the three leads of one
end of the power cord together.
Then at the other end, with an
ohmmeter, check any two
leads. Also check the third lead
with either of the first two. If a
zero reading is indicated for
any wire, the wire is broken
and a new power cord assembly
must be ordered.
11. If the winding is grounded,
remove the pipe plug in the top
of the pump and drain the oil
into a clear container. A milky
appearance to the oil will
indicate that water has entered
through worn or damaged
seals or O-rings. If this is the
case, the mechanical seals
and all O-rings will have to
be replaced.
Seal Housing
The pump is equipped with two
mechanical seals mounted in
tandem. The lower seal (#14) and
the upper seal (#5) consist of a
ceramic stationary seat and a
carbon rotating ring.
As noted, if water is detected in
the motor housing, inspect the
power cord connection, pipe plug
connections, O-rings, the motor
housing itself, and the two
mechanical seals.
There are two quarts of oil in
the motor housing. This is a
paraffinic SE-40 process oil.
The same oil is used in the seal
housing (#20) between the two
mechanical seals. To check the
seals, remove the lower housing
pipe plug (#8) and pour the oil out
into a clean, preferably glass,
container. Look for the milky
color as noted previously.
If the oil is clear, the lower seal
is still good. If this seal is
damaged, water will seep in
and continue to stain the oil,
changing it from clear, to slightly
discolored, to cloudy, and finally
to a milky white.
Except for very rare instances, the
motor will continue to be protected
by the upper mechanical seal.
Lower Seal
If water is found in the seal
chamber, the lower seal must be
replaced. Separate the volute by
removing the three cap screws
(#9) holding the base (#12) to the
upper volute.
Insert a large screwdriver in
the slotted pump shaft and strike
the impeller sharply with a plastic
or rubber headed hammer. The
impeller should spin free. The
impeller holds the rotation carbon
ring of the lower mechanical seal
against the stationary ceramic
seat by compressing a stainless
steel spring.
When the impeller is removed,
the spring will relax, allowing the
RESISTANCE
SPD50H
SPD100H
1ø Start 1ø Main 3ø Bal. 1ø Start 1ø Main 3ø Bal.
115V
6.53
1.90
—
—
—
—
230V
6.53
3.80
5.06
3.06
9.7
460V
—
—
—
—
9.7
Содержание SPD100H
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