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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5.7.2 Overload Alarm<br />
be increased if nuisance tripping occurs.<br />
CHAPTER 5: SETTINGS<br />
When a motor starts, the starting current (typically 6 × FLA for an induction motor) has an<br />
asymmetrical component. This asymmetrical current may cause one phase to see as<br />
much as 1.6 times the normal RMS starting current. If the SHORT CIRCUIT TRIP PICKUP was<br />
set at 1.25 times the symmetrical starting current, it is probable that there would be<br />
nuisance trips during motor starting. A rule of thumb has been developed over time that<br />
short circuit protection at least 1.6 times the symmetrical starting current value. This<br />
allows the motor to start without nuisance tripping.<br />
The overreach filter removes the DC component from the asymmetrical current present at<br />
the moment of fault. This eliminates overreach; however, the response time slows slightly<br />
(10 to 15 ms) but remains within specification.<br />
PATH: SETTINGS S6 CURRENT ELEM. OVERLOAD ALARM<br />
<br />
OVERLOAD [<br />
5.7.3 Mechanical Jam<br />
MESSA<strong>GE</strong><br />
MESSA<strong>GE</strong><br />
MESSA<strong>GE</strong><br />
OVERLOAD<br />
ALARM: Off<br />
ASSIGN ALARM<br />
RELAYS:<br />
If enabled as “Latched” or “Unlatched”, the Overload Alarm functions as follows. After a<br />
motor start, when the equivalent motor heating current exceeds the OVERLOAD PICKUP<br />
LEVEL, an alarm will occur. If programmed as “Unlatched”, the overload alarm resets itself<br />
when the motor is no longer in overload. If programmed as “Latched”, the RESET key must<br />
be pressed to reset the alarm once the overload condition is gone. Event recording for all<br />
alarm features is optional.<br />
For example, it may be desirable to have an unlatched alarm connected to a PLC that is<br />
controlling the load on a motor.<br />
PATH: SETTINGS S6 CURRENT ELEM. MECHANICAL JAM<br />
<br />
MECHANICAL [<br />
MESSA<strong>GE</strong><br />
MESSA<strong>GE</strong><br />
MESSA<strong>GE</strong><br />
OVERLOAD ALARM<br />
DELAY: 0.1 s<br />
OVERLOAD ALARM<br />
EVENTS: Off<br />
MECHANICAL JAM<br />
TRIP: Off<br />
ASSIGN TRIP<br />
RELAYS:<br />
MECHANICAL JAM<br />
PICKUP: 1.50 x<br />
MECHANICAL JAM<br />
DELAY: 1 s<br />
Range: Off, Latched, Unlatched<br />
Range: Alarm, Auxiliary2, Auxiliary3,<br />
Alarm & Aux2, Alarm & Aux3,<br />
Aux2 & Aux3, Alarm & Aux2 &<br />
Aux3, None<br />
Range: 0.1 to 60 s in steps of 0.1<br />
Range: On, Off<br />
Range: Off, Latched, Unlatched<br />
Range: Trip, Trip & Auxiliary2, Trip &<br />
Aux2 & Aux3, Trip & Auxiliary3<br />
Range: 1.01 to 3.00 x FLA in steps of<br />
0.01<br />
Range: 1 to 30 s in steps of 1<br />
5–60 <strong>469</strong> MOTOR MANA<strong>GE</strong>MENT RELAY – INSTRUCTION MANUAL
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