Adjustment of pump performance is a must in many applications
today. No doubt the best performance adjustments is
achieved by means of a frequency converter as this gives a large
number of advantages.
The situation
A central system for storing, cleaning/filtering and distribution of
the coolant to all the tooling machines is crucial for the operation
of a tooling machine factory. Approximately 16 m³ of coolant is
stored in a storage tank. An immersible pump, which is connected
to the common coolant supply, is placed in the tank.
All the 42 tooling machines are connected to the supply line via a
solenoid valve, which is activated when the machine is in operation.
The coolant is then lead to a receiver tank, where a built-in
level controlled valve will ensure that the tank always is filled. The
flow to the individual machines varies, depending upon the use
and the load of the machine.
The Grundfos solution
A MTRE 32-3/3 pump is placed in the tank and connected to the
common coolant supply line. The MTRE-pump is set up for constant
pressure operation, controlled by a pressure transmitter
placed within the installation. The operation information can be
put into a load profile. The MTRE pump results in reduced power
consumption as well as reduced pressure in the system.
Taking the load profile into account, a calculation of the annual
energy consumption of the MTRE-pump can be compared to the
consumption of the non-speed regulated pump. The speed-controlled
MTRE solution will only consume 8,642 kWh. This represents
a saving of 11,754 or 58% compared to a MTR solution. The outcome
Production takes round-the-clock, keeping the pump in operation
for all three daily shifts. The factory is furthermore only shut
down a few days each year. The benefits of this type of application
includes, energy savings, a soft start, which reduces noise and
stress in the system. A built-in flexibility, making pump selection
easier, built-in motor protection and communication with the
surroundings via RS 485 interface or standard digital/analogue
in/outputs.
Download case history as PDF file Reading and printing this format requires the free Adobe Acrobat reader. Get it here |
