GE M60 UR Series

GE Multilin M60 Motor Protection System 5-169
5 SETTINGS 5.6 GROUPED ELEMENTS
5
• SPEED2 ACCEL TIME FROM SPEED 1-2: This setting is provide to select maximum accelerating time from speed 1
to speed 2 when motor is switched from low-to-high speed.
Figure 5–75: TWO-SPEED ACCELERATION TIME LOGIC
j) TWO-SPEED MOTOR UNDERCURRENT
PATH: SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  MOTOR  TWO-SPEED MOTOR
 SPEED2 UNDERCURRENT
The speed 2 undercurrent function uses the same source as other speed 2 motor functions as defined by the SYSTEM
SETUP  MOTOR  2-SPEED MOTOR SOURCE setting. The phase currents must be configured on this source; otherwise,
the function will not be enabled. 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 may be used to detect loss-of-
load conditions. This may 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: This setting specifies a time to block the undercurrent function when motor is
starting directly at speed 2. Prior to starting, the motor state is determined from the
MOTOR OFFLINE operand. Refer to
the Motor setup section for additional information on the motor offline state determination. The speed 2 undercurrent
 SPEED2
 UNDERCURRENT
SPEED2 U/CURR START
BLOCK DLY: 0.50 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
SPEED2 U/CURR ALARM
PICKUP: 0.70 x FLA
Range: 0.10 to 1.00 × FLA in steps of 0.01
MESSAGE
SPEED2 U/CURR ALARM
PICKUP DLY: 2.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
SPEED2 U/CURR TRIP
PICKUP: 0.70 x FLA
Range: 0.10 to 1.00 × FLA in steps of 0.01
MESSAGE
SPEED2 U/CURR TRIP
PICKUP DLY: 2.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
SPEED2 U/CURR TRIP
RESET DLY: 2.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
SPEED2 U/CURR BLOCK:
Off
Range: FlexLogic operand
833021A1.CDR
Definite Time
Adaptive
SETTING
=Off
SPEED 2 ACCEL BLOCK
=Off
SPEED 2 MOTOR SWITCH
SETTING
= Definite Time
= Adaptive
SPEED2 ACCEL MODE
SETTING
= Ia magnitude
SPEED 2 MOTOR SOURCE
= Ib magnitude
= Ic magnitude
FLEXLOGIC OPERANDS
MOTOR STARTING
MOTOR RUNNING
MAX
AND
SETTINGS
SPEED 2 ACCELERATION
TIME
RUN
Calculate peak acceleration
current, effective acceleration
current, and acceleration time
SPEED2 ACCEL TIME FROM
SPEED 1-2
SPEED2 ACCELERATION
CURRENT
RUN
T > Acceleration time
RUN
I
2
T > Acceleration current
× acceleration time
RECORDS
START DATE
ACCELERATION TIME
START TIME
EFFECTIVE CURRENT
PEAK CURRENT
OR
FLEXLOGIC OPERANDS
MOTOR SPD2 ACL t OP
MOTOR SPD2 ACL t DPO