BJM Pumps FAHRENHEIT SK-F Series, Installation, Operation & Maintenance Manual

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21
Seal Minder
®
- Thermal Motor Sensor Switch
(For high temperature single phase pump models)
Seal Minder :
Also known as a seal failure circuit (or moisture detection circuit) is designed to inform the pump
operator that there is moisture within the oil chamber. This early warning can allow the operator to
schedule repair & inspection on the pump. The
Seal Minder sensor probe is inside the oil chamber.
(The oil chamber houses the mechanical seals that are cooled & lubricated by oil). The Seal Minder,
when properly connected to a control panel, can help indicate seal failure. The Seal Minder cable
requires a seal fail circuit in control panel for warning signal.
Along, with the Seal Minder , the Fahrenheit® Series high temperature pumps also feature thermal
temperature sensor switches that are imbedded into the motor stator windings. Two switches are
imbedded into the stator windings and wired in series. The leads are connected to the pump control
panel through the sensor cable. If the windings would see a temperature above 300 degrees F, then
the switch(s) would open and cut power to the pump. Once the temperature dropped below 300
degrees F, the switch(s) would reset, and the pump would be returned to a state of operation. This
feature is designed to prevent damage to the stator winding and allow for longer pump life.
The sensor cable consists of four leads, two are connected to the Seal Minder , and two are
connected to the thermal sensor switches located in the stator windings (Note on 400 models the
sensor and power are in a single cable).These four leads run to the pump control panel and connect
to the proper connections points for seal alarm and thermal cut off. The black and white wires on
750-1500 models, black with white stripes and white with black stripes on 400 models; are for the
Seal Minder connections and the thermal sensors will be connected to the yellow and red wires on
750-1500 models, yellow and red with yellow stripes on 400 models (see details on wiring diagram).
The single phase wiring diagram shown earlier in the manual will give a guide to the connections in
the control panel. The manual for the control panel should be consulted for the exact connections.
The sensor cable with Seal Minder and thermal sensor switch connections is standard on all
Fahrenheit® Series high temperature pumps (Note the 400 models have a different wire color code in
the single cable design). The cable is designed for a high temperature environment. The proper
replacement part can be found parts list found in this manual. BJM Pumps, can supply a control with
the Seal Minder and Thermal sensor switch option. BJM Pumps requires the
Seal Minder and
thermal sensor switches be used. Failure to connect or misuse of these devices will void warranty .