Multilin 469 Motor Management Relay ... - GE Digital Energy
Multilin 469 Motor Management Relay ... - GE Digital Energy
Multilin 469 Motor Management Relay ... - GE Digital Energy
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CHAPTER 5: SETTINGS<br />
5.7.4 Undercurrent<br />
If turned On, the Mechanical Jam element function as follows. After a motor start, a Trip<br />
occurs once the magnitude of Ia, Ib, or Ic exceeds the Pickup Level × FLA for a period of<br />
time specified by the MECHANICAL JAM DELAY settings. This feature may be used to<br />
indicate a stall condition when running. Not only does it protect the motor by taking it offline<br />
quicker than the thermal model (overload curve), it may also prevent or limit damage<br />
to the driven equipment if motor starting torque persists on jammed or broken equipment.<br />
The MECHANICAL JAM PICKUP level should be set higher than motor loading during normal<br />
operation, but lower than the motor stall level. Normally the delay is set to the minimum<br />
time delay or set so that no nuisance trips occur due to momentary load fluctuations.<br />
PATH: SETTINGS S6 CURRENT ELEM. UNDERCURRENT<br />
<br />
UNDERCURRENT [<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 UNDERCUR-<br />
RENT<br />
UNDERCURRENT<br />
ALARM: Off<br />
ASSIGN ALARM<br />
RELAYS:<br />
UNDERCURRENT<br />
ALARM<br />
UNDERCURRENT<br />
ALARM<br />
UNDERCURRENT<br />
ALARM<br />
UNDERCURRENT<br />
TRIP: Off<br />
ASSIGN TRIP<br />
RELAYS:<br />
UNDERCURRENT TRIP<br />
PICKUP: 0.70 x<br />
UNDERCURRENT 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,<br />
Auxiliary2, Aux2 & Aux3,<br />
Auxiliary3, None<br />
Range: 0.10 to 0.95 x FLA in steps of<br />
0.01<br />
Range: 1 to 60 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: 0.10 to 0.99 x FLA in steps of<br />
0.01<br />
Range: 1 to 60 s in steps of 1<br />
A trip or alarm will occurs once the magnitude Ia, Ib, or Ic falls below the pickup level × FLA<br />
for the time specified by the UNDERCURRENT ALARM DELAY. The Undercurrent element is<br />
active only when the motor is running. It is blocked upon the initiation of a motor start for<br />
the time defined by the U/C BLOCK FROM START settings (e.g. this block may be used to<br />
allow pumps to build up head before the undercurrent element trips). A value of “0” means<br />
the feature is not blocked from start. If a value other than “0” is entered, the feature is<br />
disabled when the motor is stopped and also from the time a start is detected until the<br />
time entered expires. The UNDERCURRENT ALARM PICKUP level should be set lower than<br />
motor loading during normal operations.<br />
<strong>469</strong> MOTOR MANA<strong>GE</strong>MENT RELAY – INSTRUCTION MANUAL 5–61
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