GE M60 Instruction Manual page 432

GROUPED ELEMENTS
The speed 2 undercurrent function uses the same source as other speed 2 motor functions as defined by the
 MOTOR  2-SPEED MOTOR SOURCE
function is disabled. The element responds to per-phase currents.
If the speed 2 undercurrent function is enabled, a trip or alarm are initiated once the IA, IB or IC current magnitude falls
below the pickup level for a period of time specified by the delay. For example, undercurrent can be used to detect loss-of-
load conditions. This can be especially useful for detecting process related problems.
This element is active if the motor is running at speed 2. The undercurrent function at speed 2 becomes functional only if
undercurrent at speed 1 is enabled. When the undercurrent function at any speed is not required, it can be permanently
blocked.
SPEED2 U/CURR START BLOCK DLY
directly at speed 2. Prior to starting, the motor state is determined from the
under the
SETTINGS  SYSTEM SETUP  MOTOR
determination. The speed 2 undercurrent element is active only when the motor is running at speed 2 and is blocked upon
the initiation of a motor start for a period of time defined by the
block can be used to allow pumps to build up head before the undercurrent element trips or alarms). A value of 0 specifies
5
that the feature is not blocked from start. For values other than 0, the feature is disabled when the motor is stopped and
also from the time a start is detected until the time entered expires.
SPEED2 U/CURR ALARM PICKUP
current during normal operations.
SPEED2 U/CURR ALARM PICKUP DLY
any short lowering of the current (for example, during system faults).
SPEED2 U/CURR TRIP PICKUP
setting for the alarm stage.
SPEED2 U/CURR TRIP PICKUP DLY
short lowering of the current (for example, during system faults).
SPEED2 U/CURR TRIP RESET DLY
the breaker or contactor to disconnect the motor.
SPEED2 U/CURR BLOCK
switch or other user specified condition typically is used to block the function.
5-224
SPEED2 U/CURR TRIP

PICKUP: 0.70 x FLA
SPEED2 U/CURR TRIP

PICKUP DLY: 2.00 s
SPEED2 U/CURR TRIP

RESET DLY: 2.00 s
SPEED2 U/CURR BLOCK:

Off
setting. The phase currents must be configured on this source; otherwise, the
— This setting specifies a time to block the undercurrent function when motor is starting
menu for additional information on the motor offline state
— This setting specifies a pickup threshold for the alarm stage. Set it less than the motor load
— This setting specifies a time delay for the alarm stage. Set it long enough to overcome
— This setting specifies a pickup threshold for the trip stage. Set it less than the corresponding
— This setting specifies a time delay for the trip stage. Set it long enough to overcome any
— This setting specifies a time delay to reset the trip command. Set it long enough to allow
— This setting specifies an operand used to block the speed 2 undercurrent function. A panel cutoff
Range: 0.10 to 0.95 × FLA in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: FlexLogic operand
operand. See the Motor section
MOTOR OFFLINE
SPEED2 U/CURR START BLOCK DLY
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
SYSTEM SETUP
setting (for example, this