5-168 M60 Motor Protection System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
Figure 5–74: TWO-SPEED MOTOR THERMAL MODEL LOGIC
i) TWO-SPEED MOTOR ACCELERATION TIME
PATH: SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) MOTOR TWO-SPEED MOTOR
SPEED2 ACCELERATION TIME
If the speed 2 acceleration time functionality is enabled, the element will read current from the source selected for speed 2
by the SETTINGS SYSTEM SETUP MOTOR 2-SPEED MOTOR SOURCE setting when the motor is switched from
speed 1 to speed 2.
Acceleration time settings and functionality at speed 2 are identical to those of speed 1 and are described in the
Acceleration time sub-section. This applies to the
SPEED2 ACCELERATION CURRENT, SPEED2 ACCELERATION TIME
and SPEED2 ACCEL MODE settings.
Two additional setting 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 setting specifies the maximum acceleration time at speed 2. When motor is switched from a
low-to-high speed setting, the
SPEED2 TIMER FROM SPEED 1-2 setting specifies the acceleration time. When motor is
switched from high speed to low speed, the
SPEED2 TRANS 2-1 OP FlexLogic operand is set for time defined by the SPEED2
SWITCH 2-1 DELAY
setting to allow inputs for control logic of contactors and breakers at both speeds. FlexLogic operands
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
ACCELERATION TIME
SPEED2 ACCELERATION
CURRENT: 6.00 x FLC
Range: 1.00 to 10.00
FLC in steps of 0.01
MESSAGE
SPEED2 ACCELERATION
TIME: 10.00 s
Range: 0.05 to 180.00 s in steps of 0.01
MESSAGE
SPEED2 ACCEL MODE:
Definite Time
Range: Definite Time, Adaptive
MESSAGE
SPEED2 ACCEL TIME FR
SPEED 1-2: 10.00 s
Range: 0.05 to 180.00 s in steps of 0.01
MESSAGE
SPEED2 ACCEL BLOCK:
Off
Range: FlexLogic operand
Ia
Ib
Ic
Va
Vb
Vc
Thermal model,
voltage dependent
Thermal model
settings, speed 1
Thermal model
settings, speed 2
ACTIVE
Off On
SETTING
=Ia
=Ib
MOTOR LINE SOURCE
=Ic
VOLTAGE CONNECTION
Vab
Wye Delta
Vca
Vbc
Vag
Vcg
Vbg
SETTING
=Ia
=Ib
SPEED2 MOTOR SOURCE
=Ic
VOLTAGE CONNECTION
Vab
Wye Delta
Vca
Vbc
Vag
Vcg
Vbg
SETTING
Off=0
SPEED2 MOTOR SWITCH
SETTING
Enabled = 1
2-SPEED MOTOR
PROTECTION
AND
0
T
RST
SETTING
SPEED2 SWITCH 2-1
DELAY
FLEXLOGIC OPERAND
MOTOR SPD2 TR 2-1 OP
833020A1.CDR
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