GE M60 UR Series

GE Multilin M60 Motor Protection System 5-161
5 SETTINGS 5.6 GROUPED ELEMENTS
5
For the three abnormal voltage situations, the M60 makes a transition from the acceleration curve to Motor or Flex-
Curve when the MOTOR RUNNING or MOTOR OVERLOADED operands are asserted.
Figure 5–69: VOLTAGE DEPENDENT OVERLOAD SCHEME LOGIC
• THERMAL MODEL BLOCK: The thermal model can be blocked by any asserted FlexLogic operand. While the block-
ing signal is applied, the element will remain running and update the thermal memory, but the states of the
MOTOR
START INHIBIT
and MOTOR THERMAL OP operands will remain unchanged. When the element blocking signal is
removed, the element logic will be based on the new value of thermal capacity and will update the status of the
MOTOR
START INHIBIT
and MOTOR THERMAL OP operands.
In the event of a loss of control power to the relay while the motor status is not offline, the thermal capacity will remain
unchanged when control power is restored. If the motor status is offline when control power is lost, the thermal capacity will
decay for the duration of the loss of control power based on the stopped motor cooling rate.
NOTE
833018A2.CDR
OR
AND
AND
AND
AND
AND
AND
AND
AND
AND
Voltage dependent
motor curve
SETTING
Motor
FlexCurve
Curve
SETTING
Disabled = 0
Enabled = 1
Voltage Dependent Function
SETTING
=Off
Voltage Dependent Voltage
Loss
SETTINGS
SRC 1
Motor Line Source
SETTINGS
Vratio
Auxiliary VT Ratio
Vrated
Motor Nameplate Voltage
Vmin
Voltage Dependent Min
Motor Volts
SETTING
Phase VT Ratio
rated
ratioRMS
V
VV
V
´
=
%110min
VVV <<
%110
VV >
min
V < V
FLEXLOGIC OPERAND
MOTOR RUNNING
FLEXLOGIC OPERAND
MOTOR OVERLOAD
FLEXLOGIC OPERAND
MOTOR STARTING
FlexCurve™
Motor curve
)1(05054758.0)1(02530337.0
2116623.2TD
)(
2
-´+-´
´
=
II
It
Voltage dependent
FlexCurve™
110% voltage
locked rotor curve
Minimum voltage
locked rotor curve
100% voltage
locked rotor curve
2
5
2
5
)(
I
tI
It
´
=
2
1
2
1
)(
I
tI
It
´
=
2
3
2
3
)(
I
tI
It
´
=
from the menuSystem Setup > Motor
from the
menu
System Setup
> AC Inputs > Voltage