SPX W+, Инструкция по эксплуатации, Страница: 11 / 24

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453343 ISS S 07.2010
Motor Overload
Depending on the impeller diameter and motor horsepower, there is a risk the
pump motor will overload if operated with a fully opened, unrestricted
discharge.
To minimize this risk:
1. Before operating the pump, review performance curve and application
giving consideration to motor horsepower and impeller diameter
versus expected discharge flow rate and pressure. If the pump is
operated with less than expected discharge pressure, the flow rate will
increase and the load on the motor will increase.
2. Install a throttling type valve in the discharge piping to allow control of
pump discharge flow rate during initial operation. The valve may be
removed later when the system is proven to supply adequate
discharge pressure to prevent overload.
Impeller Shaft Location
The location of the impeller shaft on the motor shaft is critical for correct
pump operation and to obtain maximum operating efficiency.
APV Centrifugal Pumps are designed to achieve excellent operating
efficiency. This efficiency is possible, in part, because of precision
manufacturing of the pump components. The impeller must be precisely
located between the casing and backplate to take full advantage of the
pump's operating efficiency.
Incorrect location of the impeller shaft may cause the impeller to contact the
casing or the backplate during operation and cause extensive damage to the
pump.
The procedures for correctly locating the impeller shaft are described in the
Maintenance section. This should be referred to whenever:
1. A new pump is installed onto a motor or pedestal.
2. The impeller shaft is loosened or removed from the motor or pedestal
shaft.
3. A replacement casing or backplate is installed.
Important Warnings