IMP Pumps NMTC module - Manual (Page 29)

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This page is used to adjust the values of various pump parameters. On the basis of these user input
parameters, the pump will automatically regulate itself. On the top right side of the page you can find
the Regulation settings column.
The settings are in the following order (from top to bottom):
• Limit head (Hmax): sets the maximum output head (differential
pressure).
• Hmax proportional: sets the percentage of proportionality
between head and flow. 0% proportionality sets the Q-H curve to
constant pressure. Here the pressure doesn‘t change with flow,
there is no proportionality. X% proportionality sets the Q-H curve
to proportional pressure. This value determines the percentage of
pressure fall in relation to Hmax. Example: Limit head value (Hmax)
is set to 10 m and Hmax proportional is set to 50%. As a result the Q
–H curve is going to start at 5 m and rise in a straight line until it
reaches 10 m. After that point, it will follow the unregulated curve.
See the graph on the right for the shape of the Q-H curve if Limit
head or Hmax proportional is set.
• Limit RPM: sets the maximum RPM of the pump. Comparing to
the unregulated curve, the Q-H curve scales down. RPM
limiting is recommended when you want to change the curve.
This sort of regulating is similar to a manual adjustable pump.
• Limit power: sets the maximum power of the pump. When
limiting power the Q-H curve scales down and its slope
gradually decreases
• Switch on the relay
• Input 1