Multilin 139 series - Figure; Multilin Fault Finder

FIGURE 3-5 [ii] MULTILIN FAULT FINDER
TRIPPED RELAY INDICATION
PROBABLE CAUSE OF TRIP
U/B 0/L START RTD G/F TRIP U/C
ON
START TIMER EXCEEDED
0
•
•
0
0
- locked rotor
•
0
•
- too many starts
-staot timer set too low
OVERLOAD
0
•
0
0 0
•
0
•
-excessive overloads dunng running
- mechanical 1am rapid trip
-shor1 c1rcu1!
HIGH TEMPERATURE {RTD OPTION)
0
0 0
•
0
•
0
•
- blocked vent1lat1on
-cooling fins blocked
-high ambient temperature
•
•
•
0
0
•
0
•
BLOWN FUSE START
-check fuse:,
EXCESSIVE UNBALANCE
- blown fuses
•
0
0 0 0
•
0
•
- single phase supply
- loose wiring connection
- short between motor windings
GROUND FAULT
0 0
0
0
•
•
0
•
-- motor winding to case short
-wmng touching metal ground
GROUND FAULT
•
•
0
0
•
•
0
•
-motor w1nd1ng lo case short
-wmng touching metal ground
MEMORY LOCKOUT
0
0
0
0 0
•
0
•
-memory still locked out after
oower •s applied
UNDERCURRENT ALARM
0
0
0 0 0
• •
-pump loss of suction
0
- pump closed discharge valve
- blower
loss of airflow
-conveyor overload warning
29
Courtesy of NationalSwitchgear.com