Multilin SR469 - Underpower

4. SETPOINT PROGRAMMING S10 POWER ELEMENTS
4-61
4.11.4 UNDERPOWER
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FUNCTION:
If enabled, once the magnitude of 3∅ total power falls below the Pickup Level for a period of time specified by the Delay, a trip or alarm
will occur. The Underpower element is active only when the motor is running and will be blocked upon the initiation of a motor start for a
period of time defined by the setpoint Block Element From Start (e.g. this block may be used to allow pumps to build up head before the
underpower element trips or alarms). A value of 0 means the feature is not blocked from start. If a value other than 0 is entered, the
feature will be disabled when the motor is stopped and also from the time a start is detected until the time entered expires. The pickup
level should be set lower than motor loading during normal operations.
EXAMPLE:
Underpower may be used to detect loss of load conditions.
Loss of load conditions will not always cause a significant
loss of current. Power is a more accurate representation of
loading and may be used for more sensitive detection of
load loss or pump cavitation. This may be especially useful
for detecting process related problems.