ITT PumpSmart PS220, Руководство по конфигурации и эксплуатации

Страница: 185 / 300

PS220 Configuration & Operation Guide
PS220 184
Functions &
Features
Positive Displacement Pump Protection (PD and PC Pumps)
Positive displacement and progressive cavity type pumps are significantly different from centrifugal pumps in that they
maintain a constant torque load. The torque for this type of pump is a consistent value throughout all operating speeds.
Typically the fluids pumped are used for lubrication of internal components. If these pumps are “run dry”, the lack of
lubricity will lead to a significant increase in torque required to run. Pump Protection for these types of pumps can easily
be accomplished with the PS220 Condition Monitoring Function by monitoring the normal operating torque for a sudden
increase in this value.
NOTE - When operating a constant torque load the drive must be rated for the motors nameplate amp draw. This may
require upsizing the PS220 to a larger HP size from that of the motor that will be used.
(150% overload capability required).
Please refer to the Condition Monitoring Function in this manual for more information on how to use this functionality.
NOTE:
To determine the proper torque warning and alarm limits, consult the pump manufacture for
their recommended guidelines.
This functionality is designed to complement the existing pressure relieving safety devices that should be
integral to the pumps. This form of protection is not intended to substitute the pump manufacture’s
recommended pressure relief protection. Failure to follow these instructions may result in physical injury or
equipment damage.
WARNING