Flowserve Pump Division - 7
MOTOR THERMAL PROTECTION
The motor winding is protected by three thermal switches installed in series with normally closed contacts.
The contacts will open when the winding temperature within the motor exceeds 275° F (135° C). The
thermal switches must be wired into the motor starter inside the control panel such that the motor
automatically shuts down in the event of overheating; see Figure 5: Motor Connection Diagram (page
16). Observe the amperage rating of the thermal contacts at the connected voltage.
WARNING: FAILURE TO PROPERLY CONNECT THE MOTOR THERMAL SWITCHES MAY
RESULT IN PERSONAL INJURY OR PRODUCT DAMAGE AND WILL VOID THE
FACTORY WARRANTY AND EXPLOSION PROOF CERTIFICATION.
CABLE
The motor is supplied with cable available in 35, 50, 75 and 100 foot (10.5, 15, 23, 30.5 m) lengths. The
cable jacket is suitable for extra hard usage and meets the requirements of Type W, G or SOOW per
ANSI/NFPA 70 Article 400.
MECHANICAL SEAL
The motor is equipped with two mechanical seals designed to prevent the entrance of the pumped liquid
into the motor cavity. The lower mechanical seal prevents the pumped liquid from entering the bearing
housing (filled with a non-conductive barrier fluid). The upper mechanical seal prevents the pumped
liquid from coming into contact with the bearings and the motor windings. Lower mechanical seal failure
is indicated by a moisture detection probe in the bearing house.
MOISTURE DETECTION SENSOR
A moisture detection sensor located in the bearing housing will detect failure of the lower mechanical seal
by measuring the electrical conductivity of the fluid in the oil chamber. Contamination of the cooling fluid
with the pumped liquid will cause the conductivity to increase. The sensor must be wired into an
approved moisture detection sensor relay to illuminate a light on the pump motor control panel with
increased conductivity of the fluid. The unit should be taken off-line for service with illumination of the
light. It is recommended that both the upper and lower seals should be replaced any time either requires
replacement.
WARNING: FAILURE TO PROPERLY CONNECT THE MOISTURE DETECTION SENSOR MAY
RESULT IN PERSONAL INJURY OR PRODUCT DAMAGE AND WILL VOID THE
FACTORY WARRANTY AND EXPLOSION PROOF CERTIFICATION.
CAUTION: THE LEAKAGE DETECTION CIRCUIT FOR MOTORS NAMEPLATED CLASS 1,
DIVISION 1, GROUP C & D MUST BE SUPPLIED FROM AN ISOLATED SECONDARY
CIRCUIT: 30 Vrms; 42 Vpk; 0.5 ma MAX.
CAUTION: FAILURE TO INSPECT AND REPLACE THE SEALS AS NECESSARY MAY RESULT
IN LEAKING OF PUMPED FLUID INTO THE MOTOR HOUSING RESULTING IN
DAMAGE TO THE MOTOR AND POSSIBLE ELECTRIC SHOCK.
BEARINGS
MSX Series 2 pumps are equipped with back-to-back, tapered roller thrust and single-row, ball line
bearings. The line and thrust bearings are lubricated for life with grease.
IMPELLER AND WEARING RINGS
The pump impeller is of the enclosed non-clog type capable of passing solids of limited size. The impeller
hub is keyed to the shaft and held in position by an impeller screw and impeller washer. A radial wearing
ring is supplied on the casing. Radial impeller wearing rings are available as an option.
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