Goulds Pumps 3296M - IOM - Manual (Page 88)

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3296 M Group 6/05
System Pressure
This circuit, if utilized, shuts down the pump if it is operating dry or at too low a suction pressure. A user supplied
pressure switch monitoring pressure in either the discharge or the suction pipe is required. This switch is not
available through Goulds due to the diversity in pressure, materials of construction and connection sizes.
Dry Running Protection
A pressure switch monitoring the pressure in the discharge pipe senses low pressure, indicating a loss of prime
or operation at too high a flow. Switch should be normally closed, SPDT, adjustable set point, trigger on
decreasing pressure, capable of system pressure, compatible with pumpage and compatible with plant
environment. Adjust set point to trigger at 2 PSI below the lowest discharge pressure reading attained during
normal operation. Connect wiring to terminal 15, common and ground as required.
Low Suction Pressure Protection
A pressure switch monitoring the pressure in the suction pipe senses low pressure, indicating low tank level,
clogged suction screen, or closed suction valve. The switch should be normally closed, SDPT, adjustable set
point, trigger on decreasing pressure, capable of system pressure, compatible with environment. Adjust set
point to trigger at 1 PSI below the lowest pressure reading attained during normal operation. Ensure NPSH
requirements of pump are met under these conditions. Note that suction pressure detection alone does not in
itself monitor NPSH available to pump. Connect wiring to terminals 15, common and ground as required.
NOTE: If the Liquid Leak Detector and/or the System Pressure Monitors are not used, terminals 14 and/or 15
are available for use with any latched type switch. A temperature switch or vibration switch could also be
utilized to satisfy a particular user's need. Be sure to relabel face of GTP controller to reflect new function.
NOTE: If these terminals, 14 and 15, are not used, they must be shorted to common in order for the GTP
System to operate properly.