
Toshiba Variable Frequency
Drives installed to:
1.
Reduce electricity usage. These
motors operate in the 40to 60Hz range. As such there is
approximately a 30-50% reduction in electrical usage.
2.
Control the volume of pumping
3.
Controlling the substation remotely.
4.
Cycle pumps for longevity
5.
Reduce maintenance:
A.
sensing overloads and automatically
stopping
B.
Cycling so seals do not dry out
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The controller is a BihlerTech
AT2K. This controller is unique in that it operates not on a
speed curve as most other controllers do but rather on a torque
curve. This enable the control to maximize the point of the
curve where the efficiency is at its highest point. This is
important because not all pumps are the same, therefore the
control senses where, on that particular pump, the load operates
best.
Operation of the lift station
goes through this control. The following functions can be
individually set and or monitored per motor/drive. Starting,
stopping, adjusting torque settings, reset hour meters, Hz, Amps.
Also the level of the wet well is also known at all times.
In the application to the
right, this well is set for starting at 40” level ± ¼”, the
second pump is set for 50”, third set for 60” and the fourth set
for 70”. Total depth of the well is about 14 feet. All
pumps shut down and sleep at 30” and below.
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