GE M60 Instruction Manual page 268

5.6 GROUPED ELEMENTS
For the three abnormal voltage situations, the M60 makes a transition from the acceleration curve to Motor or Flex-
Curve when the
NOTE
SETTING
Voltage Dependent Function
Disabled = 0
Enabled = 1
SETTING
Curve
FlexCurve
SETTING
Voltage Dependent Voltage
Loss
System Setup > Motor
from the
SETTINGS
Motor Line Source
Motor Nameplate Voltage
Vrated
System Setup
from the
> AC Inputs > Voltage
menu
SETTINGS
Phase VT Ratio
Auxiliary VT Ratio
5
SETTING
Voltage Dependent Min
Motor Volts
FLEXLOGIC OPERAND
MOTOR RUNNING
FLEXLOGIC OPERAND
MOTOR OVERLOAD
FLEXLOGIC OPERAND
MOTOR STARTING
• THERMAL MODEL BLOCK: The thermal model can be blocked by any asserted FlexLogic™ operand. While the
blocking signal is applied, the element will remain running and update the thermal memory, but the states of the
MOTOR START INHIBIT
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
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.
5-130
or
MOTOR RUNNING MOTOR OVERLOADED
Motor
= Off
menu
SRC 1
V ´ V
RMS ratio
=
V
V
rated
<
Vratio V V
min
V >
V < V
Vmin
OR
Figure 5–62: VOLTAGE DEPENDENT OVERLOAD SCHEME LOGIC
and
MOTOR THERMAL OP
and
MOTOR THERMAL OP
M60 Motor Protection System
operands are asserted.
<
V
110 %
V
110 %
min
operands will remain unchanged. When the element blocking signal
operands.
5 SETTINGS
Motor curve
AND
TD ´ . 2 2116623
) ( =
I t
2
. 0 02530337 ´ ( - ) 1 + . 0 05054758 ´ (
I
AND FlexCurve™
AND
AND
Voltage dependent
AND
motor curve
Voltage dependent
AND
FlexCurve™
110% voltage
AND
locked rotor curve
2
´
I t
5 5
) ( =
I t
2
I
Minimum voltage
AND
locked rotor curve
2
´
I t
1 1
) ( =
I t
2
I
100% voltage
AND
locked rotor curve
2
´
I t
3 3
) ( =
I t
2
I 833018A2.CDR
- ) 1
I
GE Multilin