5–62
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
If turned On, the Mechanical Jam element function as follows. After a motor start, a Trip
occurs once the magnitude of Ia, Ib, or Ic exceeds the Pickup Level × FLA for a period of
time specified by the
MECHANICAL JAM DELAY
settings. This feature may be used to
indicate a stall condition when running. Not only does it protect the motor by taking it off-
line quicker than the thermal model (overload curve), it may also prevent or limit damage
to the driven equipment if motor starting torque persists on jammed or broken equipment.
The
MECHANICAL JAM PICKUP
level should be set higher than motor loading during normal
operation, but lower than the motor stall level. Normally the delay is set to the minimum
time delay or set so that no nuisance trips occur due to momentary load fluctuations.
5.7.4
Undercurrent
PATH: SETTINGS
S6 CURRENT ELEM.
UNDERCURRENT
A trip or alarm will occurs once the magnitude Ia, Ib, or Ic falls below the pickup level
×
FLA
for the time specified by the
UNDERCURRENT ALARM DELAY
. The Undercurrent element is
active only when the motor is running. It is blocked upon the initiation of a motor start for
the time defined by the
U/C BLOCK FROM START
settings (e.g. this block may be used to
allow pumps to build up head before 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 feature is
disabled when the motor is stopped and also from the time a start is detected until the
time entered expires. The
UNDERCURRENT ALARM PICKUP
level should be set lower than
motor loading during normal operations.
UNDERCURRENT [
]
BLOCK UNDERCURRENT
FROM START: 0 s
Range: 0 to 15000 s in steps of 1
MESSAGE
UNDERCURRENT
ALARM: Off
Range: Off, Latched, Unlatched
MESSAGE
ASSIGN ALARM RELAYS:
Alarm
Range: Alarm, Alarm & Auxiliary2,
Alarm & Aux2 & Aux3,
Auxiliary2, Aux2 & Aux3,
Auxiliary3, None
MESSAGE
UNDERCURRENT ALARM
PICKUP: 0.70 x FLA
Range: 0.10 to 0.95 x FLA in steps of
0.01
MESSAGE
UNDERCURRENT ALARM
DELAY: 1 s
Range: 1 to 60 s in steps of 1
MESSAGE
UNDERCURRENT ALARM
EVENTS: Off
Range: On, Off
MESSAGE
UNDERCURRENT
TRIP: Off
Range: Off, Latched, Unlatched
MESSAGE
ASSIGN TRIP RELAYS:
Trip
Range: Trip, Trip & Auxiliary2, Trip &
Aux2 & Aux3, Trip & Auxiliary3
MESSAGE
UNDERCURRENT TRIP
PICKUP: 0.70 x FLA
Range: 0.10 to 0.99 x FLA in steps of
0.01
MESSAGE
UNDERCURRENT TRIP
DELAY: 1 s
Range: 1 to 60 s in steps of 1
Summary of Contents for Masoneilan 469 Series
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Page 92: ...3 28 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 3 INSTALLATION ...
Page 256: ...5 112 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 5 SETTINGS ...
Page 298: ...6 42 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 6 ACTUAL VALUES ...
Page 321: ...CHAPTER 8 APPENDIX 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL 8 9 808712A1 CDR ...
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