GE M60 UR Series, Instruction Manual

Page: 293 / 662

GE Multilin M60 Motor Protection System 5-165
5 SETTINGS 5.6 GROUPED ELEMENTS
5
• MECH JAM OVERCURRENT PICKUP: This setting defines excessive current condition that identifies a mechanical
jam. As the element is not armed during start conditions, this threshold can be set below the starting current. Since the
element is armed during overload conditions, this setting should be higher than the maximum overload current. The
setting is entered in multiplies of FLA (defined in the
SYSTEM SETUP

MOTOR
menu).
• MECH JAM PICKUP DELAY: This setting specifies the pickup delay of the element. In the case of large motors that
could feed close-in feeder faults, this setting can coordinate with feeder protection to avoid false tripping due to exces-
sive fault currents fed by the motor.
• MECH JAM RESET DELAY: This setting defines the reset delay of the element. Typical application includes time seal-
in of the tripping command.
Figure 5–72: MECHANICAL JAM SCHEME LOGIC
f) UNDERCURRENT
PATH: SETTINGS

GROUPED ELEMENTS

SETTING GROUP 1(6)

MOTOR

UNDERCURRENT
The undercurrent function uses the source defined by the
SYSTEM SETUP

MOTOR

MOTOR LINE SOURCE
setting.
Phase currents must be configured on this source; otherwise, the undercurrent function will not be operational. The ele-
ment responds to a per-phase current.

UNDERCURRENT

UNDERCURRENT
FUNCTION: Disabled
Range: Enabled, Disabled
MESSAGE
UNDERCURRENT START
BLOCK DLY:
0.50 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
UNDERCURRENT ALARM
PICKUP: 0.70 x FLA
Range: 0.10 to 0.95 × FLA in steps of 0.01
MESSAGE
UNDERCURRENT ALARM
PICKUP DLY:
2.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
UNDERCURRENT TRIP
PICKUP: 0.70 x FLA
Range: 0.10 to 0.95 × FLA in steps of 0.01
MESSAGE
UNDERCURRENT TRIP
PICKUP DLY:
1.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
UNDERCURRENT TRIP
RESET DLY:
1.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
UNDERCURRENT BLOCK:
Off
Range: FlexLogic operand
MESSAGE
UNDERCURRENT TARGET:
Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
UNDERCURRENT EVENTS:
Disabled
Range: Enabled, Disabled
MECH JAM FUNCTION:
MECH JAM BLK:
MOTOR STARTING
MECH JAM RESET
DELAY:
MECHANICAL JAM OP
MECHANICAL JAM DPO
MECHANICAL JAM PKP
MECH JAM PICKUP
DELAY:
MECH JAM
OVERCURRENT PICKUP:
SYSTEM SETUP/MOTOR/
MOTOR LINE SOURCE:
Off = 0
RUN
IA mag
IC mag
IB mag
IA PICKUP OR
IC > PICKUP
IB > PICKUP OR
Enabled = 1
SETTING
SETTING
FLEXLOGIC OPERAND
FLEXLOGIC OPERANDS
SETTINGS
SETTING
SETTING
833012A2.CDR
AND
t
PKP
RST
t