Multilin SR469 - Undercurrent

S6 CURRENT ELEMENTS 4. SETPOINT PROGRAMMING
4-42
4.7.4 UNDERCURRENT
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FUNCTION:
If enabled, once the magnitude of either Ia, Ib, or Ic falls below the pickup level × FLA for a period of time specified by the Delay, a trip
or alarm will occur. The Undercurrent 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 U/C Block From Start (e.g. this block may be used to allow pumps to build up head be-
fore the undercurrent element trips). A value of 0 means the feature is not blocked from start. If a value other than 0 is entered, the fea-
ture 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:
If a pump is cooled by the liquid it pumps, loss of load may
mean that the pump overheats, program undercurrent as
enabled. If the motor loading should never fall below 0.75 ×
FLA, even for short durations, the Undercurrent Trip pickup
could be set to 0.70 and the Undercurrent Alarm to 0.75. If
the pump is always started loaded, the block from start fea-
ture should be disabled (programmed as 0).
• Time delay is typically set as quick as possible, 1 s.