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Multilin 469 Motor Management Relay ... - GE Digital Energy

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CHAPTER 5: SETTINGS<br />

5.11.4 Underpower<br />

PATH: SETTINGS S10 POWER ELEMENTS UNDERPOWER<br />

<br />

UNDERPOWER [<br />

MESSA<strong>GE</strong><br />

MESSA<strong>GE</strong><br />

MESSA<strong>GE</strong><br />

MESSA<strong>GE</strong><br />

MESSA<strong>GE</strong><br />

MESSA<strong>GE</strong><br />

MESSA<strong>GE</strong><br />

MESSA<strong>GE</strong><br />

MESSA<strong>GE</strong><br />

BLOCK UNDERPOWER<br />

FROM START: 0 s<br />

UNDERPOWER<br />

ALARM: Off<br />

ASSIGN ALARM<br />

RELAYS:<br />

UNDERPOWER ALARM<br />

LEVEL: 2 kW<br />

UNDERPOWER ALARM<br />

DELAY: 1 s<br />

UNDERPOWER ALARM<br />

EVENTS: Off<br />

UNDERPOWER<br />

TRIP: Off<br />

ASSIGN TRIP<br />

RELAYS:<br />

UNDERPOWER TRIP<br />

LEVEL: 1 kW<br />

UNDERPOWER TRIP<br />

DELAY: 1 s<br />

Range: 0 to 15000 s in steps of 1<br />

Range: Off, Latched, Unlatched<br />

Range: Alarm, Alarm & Auxiliary2,<br />

Alarm & Aux2 & Aux3, Alarm &<br />

Auxiliary3, Auxiliary2, Aux2 &<br />

Aux3, Auxiliary3, None<br />

Range: 1 to 25000 kW in steps of 1<br />

Range: 1 to 30 s in steps of 1<br />

Range: On, Off<br />

Range: Off, Latched, Unlatched<br />

Range: Trip, Trip & Auxiliary2, Trip &<br />

Aux2 & Aux3, Trip & Auxiliary3<br />

Range: 1 to 25000 kW in steps of 1<br />

Range: 1 to 30 s in steps of 1<br />

If enabled, once the magnitude of 3Φ total power falls below the Pickup Level for a period<br />

of time specified by the Delay, a trip or alarm will occur. The Underpower element is active<br />

only when the motor is running and will be blocked upon the initiation of a motor start for<br />

a period of time defined by the BLOCK ELEMENT FROM START settings (e.g. this block may<br />

be used to allow pumps to build up head before the underpower element trips or alarms). A<br />

value of 0 means the feature is not blocked from start. If a value other than 0 is entered,<br />

the feature will be disabled when the motor is stopped and also from the time a start is<br />

detected until the time entered expires. The pickup level should be set lower than motor<br />

loading during normal operations.<br />

For example, underpower may be used to detect loss of load conditions. Loss of load<br />

conditions will not always cause a significant loss of current. Power is a more accurate<br />

representation of loading and may be used for more sensitive detection of load loss or<br />

pump cavitation. This may be especially useful for detecting process related problems.<br />

<strong>469</strong> MOTOR MANA<strong>GE</strong>MENT RELAY – INSTRUCTION MANUAL 5–83

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