GE M60 Instruction Manual page 314

GROUPED ELEMENTS
If the speed 2 acceleration time functionality is enabled, the element reads current from the source selected for speed 2 by
the S
ETTINGS  SYSTEM SETUP  MOTOR  2-SPEED MOTOR SOURCE
speed 2.
Acceleration time settings and functionality at speed 2 are identical to those of speed 1 and are described in the
Acceleration Time section earlier. This applies to the
SPEED2 ACCEL MODE
Two additional settings define the transition between speeds. A two-speed motor is usually started at a low speed (speed
1) and then switched to a higher speed (speed 2) when required. When the motor starts directly at high speed, then the
SPEED2 ACCELERATION TIME
a low-to-high speed setting, the
switched from high speed to low speed, the
setting to allow inputs for control logic of contactors and breakers at both speeds. FlexLogic operands
SWITCH 2-1 DELAY
required for contactor and breaker control are provided. The acceleration time at speed 2 becomes functional only if the
acceleration time at speed 1 is enabled. When the acceleration time at any speed is not required, it can be permanently
blocked.
SPEED2 ACCEL TIME FROM SPEED 1-2
when the motor switches from low-to-high speed.
SETTING
SPEED 2 ACCEL BLOCK
SPEED 2 MOTOR SWITCH
SETTING
5
SPEED2 ACCEL MODE
SETTING
SPEED 2 MOTOR SOURCE
FLEXLOGIC OPERANDS
MOTOR STARTING
MOTOR RUNNING
5.7.3.10 Two-speed motor undercurrent
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  MOTOR  TWO-SPEED MOTOR  SPEED2
UNDERCURRENT
 SPEED2
 UNDERCURRENT
5-186
settings.
setting specifies the maximum acceleration time at speed 2. When the motor is switched from
SPEED2 TIMER FROM SPEED 1-2
SPEED2 TRANS 2-1 OP
— This setting is provide to select maximum accelerating time from speed 1 to speed 2
Figure 5-97: Two-speed acceleration time logic
= Off
AND
= Off
= Definite Time
Definite Time
= Adaptive
Adaptive
= Ia magnitude
= Ib magnitude
MAX
= Ic magnitude
SPEED2 U/CURR START

BLOCK DLY: 0.50 s
SPEED2 U/CURR ALARM

PICKUP: 0.70 x FLA
SPEED2 U/CURR ALARM

PICKUP DLY: 2.00 s
SPEED2 U/CURR TRIP

PICKUP: 0.70 x FLA
SPEED2 U/CURR TRIP

PICKUP DLY: 2.00 s
setting when the motor is switched from speed 1 to
SPEED2 ACCELERATION CURRENT
setting specifies the acceleration time. When motor is
FlexLogic operand is set for time defined by the
SETTINGS
SPEED 2 ACCELERATION
TIME
SPEED2 ACCELERATION
CURRENT
SPEED2 ACCEL TIME FROM
SPEED 1-2
RUN
T > Acceleration time
OR
RUN
I 2 T > Acceleration current
× acceleration time
RUN
Calculate peak acceleration
current, effective acceleration
current, and acceleration time
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.10 to 1.00 × FLA in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.10 to 1.00 × FLA in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
, , and
SPEED2 ACCELERATION TIME
SPEED2
FLEXLOGIC OPERANDS
MOTOR SPD2 ACL t OP
MOTOR SPD2 ACL t DPO
RECORDS
START DATE
START TIME
ACCELERATION TIME
EFFECTIVE CURRENT
PEAK CURRENT
833021A1.CDR