6
C-3.2) Overload Protection Single Phase -
The type of in-winding overload protector used is referred
to as an inherent overheating protector and operates on the
combined eff ect of temperature and current. This means that
the overload protector will trip out and shut the pump off if the
windings become too hot, or the load current passing through
them becomes too high. It will then automatically reset and start
the pump up after the motor cools to a safe temperature. In the
event of an overload, the source of this condition should be
determined and rectifi ed immediately.
DO NOT LET THE PUMP
CYCLE OR RUN IF AN OVERLOAD CONDITION OCCURS !
C-3.3) Wire Size:
Consult a qualifi ed electrician for proper wire size if additional
power cable length is required. See table for electrical
information.
SECTION D: START-UP OPERATION
D-1) Check Voltage and Phase:
Before operating pump, compare the voltage and phase
information stamped on the pump identifi cation plate to the
available power.
D-2) Check Pump Rotation:
Before putting pump into service for the fi rst time, the motor
rotation must be checked. Improper motor rotation can result
in poor pump performance and can damage the motor and/
or pump. To check the rotation, suspend the pump freely,
momentarily apply power and observe the “kickback”.
“Kickback” should always be in a counter-clockwise direction as
viewed from the top of the pump motor housing.
D-2.1) Incorrect Rotation for Three-Phase Pumps:
In the event that the rotation is incorrect for a three-phase
installation, interchange any two power cord leads at the control
box.
DO NOT
change leads in the cable housing in the motor.
Recheck the “kickback” rotation again by momentarily applying
power.
D-2.2) Incorrect Rotation for Single-Phase Pumps:
In the unlikely event that the rotation is incorrect for a single
phase pump, contact a CP&S Service Center.
D-3.1) Identifi cation Plate:
Record the numbers from the pump identifi cation plate for future
reference.
D-3.2) Insulation Test:
Before the pump is put into service, an insulation (megger)
test should be performed on the motor. The resistance values
(ohms) as well as the voltage (volts) and current (amps) should
be recorded.
D-3.3) Pump-Down Test:
After the pump has been properly wired and lowered into the
basin, sump or lift station, it is advisable to check the system by
fi lling with liquid and allowing the pump to operate through its
pumping cycle. The time needed to empty the system, or pump-
down time along with the volume of water, should be recorded.
SECTION E: PREVENTATIVE MAINTENANCE
As the motor is oil fi lled, no lubrication or other maintenance
is required, and generally CP&S pumps will give very reliable
service and can be expected to operate for years on normal
sewage pumping without failing. However as with any
mechanical piece of equipment a preventive maintenance
program is recommended and suggested to include the
following checks:
1)
Inspect motor chamber for oil level and contamination and
repair as required per section F-1.
2)
Inspect impeller and body for excessive build-up or
clogging and repair as required per section F-2.
3)
Inspect motor, bearings and shaft seal for wear or leakage,
replace as required per section F-3.
SECTION F: SERVICE AND REPAIR
NOTE: All item numbers in ( ) refer to Figures 11 & 12
.
F-1) Lubrication:
Anytime the pump is removed from operation the cooling oil in
the motor housing (2) must be checked visually for oil level and
contamination.
F-1.1) Checking Oil:
Motor Housing -
To check oil, set unit upright. Remove pipe
plug (5) from motor housing (2). With a fl ashlight, visually
inspect the oil in the motor housing (2) to make sure it is
clean and clear, light amber in color and free from suspended
particles. Milky white oil indicates the presence of water. Oil
level should be just above the motor when pump is in a vertical
position.
F-1.2) Testing Oil:
1.
Place pump on it’s side, remove pipe plug (5) from motor
housing (2) and drain oil into a clean, dry container.
2.
Check oil for contamination using an oil tester with a
range to 30 Kilovolts breakdown.
3.
If oil is found to be clean and uncontaminated (measure
above 15 KV. breakdown), refi ll the motor housing as per
section F-1.3.
4.
If oil is found to be dirty or contaminated (or measures
below 15 KV. breakdown), the the pump must be carefully
inspected for leaks at the shaft seal (38), cord assem
blies (10), square ring (36) and pipe plug (5) before
refi lling with oil. To locate the leak, perform a pressure test
as per section F-1.4. After leak is repaired, refi ll with new
oil as per section F-1.3.
F-1.3) Replacing Oil:
Motor Housing -
Set unit upright and refi ll with new cooling
oil as per Table 1 (see parts list for amount). Fill to just above
motor as an air space must remain in the top of the motor
housing (2) to compensate for oil expansion (see Figure 2 or
11). Apply pipe thread compound to threads of pipe plug (5)
then assemble to motor housing (2).