Mody Pumps MHMXP - Manual (Page 6)

MOTOR PROTECTION
IT IS ESSENTIAL THAT THE PUMP BE USED WITH A STARTER AND PREFERABLY A PANEL
BOARD. CONTROL PANELS INCORPORATING ALL PROTECTIVE DEVICES ARE READILY
AVAILABLE. PLEASE CONTACT YOUR NEAREST DISTRIBUTOR. THE OVERLOAD RELAY IN THE
STARTER SHOULD BE CHOSEN ACCORDINGLY AND AMPERES SET AT THE FULL LOAD SETTING
FOR THE PARTICULAR MODEL OF THE PUMP.
IMPORTANT.
THE PUMP IS SUPPLIED WITH TWO CABLES:
• RED/WHITE/BLACK ARE THE POWER CORES.
• GREEN CORE IS FOR EARTHING.
• TRAILING CABLE - BLACK (P1) & WHITE (P2) ARE THERMALS AND RED (W1) & ORANGE
(W2) ARE MOISTURE LEADS
PLEASE SEE ENCLOSED WIRING INFORMATION ON MOTOR AND THERMAL/MOISTURE
PROTECTION.
THE SUBMERSIBLE MOISTURE PROTECTION SYSTEM CONSISTS ON THE NON-WICKING CABLE
CAP ASSEMBLY AND THE DUAL MOISTURE SENSING PROBES. THE CABLE CAP ASSEMBLY
PREVENTS MOISTURE FROM WICKING THROUGH THE CABLE ASSEMBLY EVEN WHEN THE CABLE
JACKET HAS BEEN PUNCTURED. POWER AND CONTROL CONDUCTORS ARE STRIPPED BARE AND
TERMINATED IN BUTT CONNECTORS. THE CABLE AND BUTT CONNECTOR ASSEMBLIES ARE
ENCAPSULATED IN EPOXY ASSURING A POSITIVE BOND TO THE CONDUCTORS. CONCENTRIC
RINGS IN THE CAP ASSEMBLY ASSURE THAT A POSITIVE BOND EXITS BETWEEN THE EPOXY
AND THE MOTOR HOUSING.
DUAL MOISTURE SENSING PROBES (WARWICK TYPE) EXTEND INTO THE OIL CHAMBER LOCATED
BETWEEN THE TANDEM MECHANICAL SEALS. SHOULD THE OUTER SEAL FAIL, WATER WILL
ENTER THE OIL CHAMBER THROUGH THE LABYRINTH SLINGER PATHS AND CREATE A
WATER/OIL EMULSION IN THE OIL CHAMBER. THE MOISTURE DETECTION CONTROL SYSTEM
APPLIES 500 VOLTS TO THE MOISTURE PROBES. THE PRESENCE OF WATER IN THE OIL
CHAMBER INCREASES THE CONDUCTIVITY SUFfiCIENTLY TO INCREASE CURRENT flOW THROUGH
THE PROBE CIRCUIT WHICH ILLUMINATES A WARNING LIGHT AND ACTIVATES A RELAY TO
DE-ENERGIZE THE MOTOR. THE RELAY IS PURCHASED SEPARATELY. THE MOISTURE
DETECTION CONTROL SYSTEM MUST BE SO CONNECTED FOR THE WARRANTY AND THE U/L
LISTING TO BE VALID.