GE M60

CHAPTER 5: SETTINGS CONTROL ELEMENTS
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 5-295
5
Figure 5-166: Reduced voltage starting current characteristic
REDUCED VOLTAGE STARTING — This setting enables and disables the reduced voltage starting feature.
TRANSITION MODE — This setting selects the reduced voltage starting transition method. The reduced voltage timer is
initiated at the beginning of a motor start; that is, when the motor status transitions from offline to starting. There are three
modes of transition:
• “Current Only” — When the motor load falls below the
REDUCED VOLTAGE FLA setting prior to the expiration of the
reduced voltage timer, a transition is initiated by asserting the REDUCED VOLT CTRL operand for a period of one second.
Any contact output assigned to this operand operates for this period of time. If the reduced voltage timer expires prior
to the motor load dropping below the
REDUCED VOLTAGE FLA setting, the REDUCED VOLT CTRL operand does not change
state and the REDUCED VOLT OP operand is asserted.
• “Current Or Timer” — When the motor load falls below the
REDUCED VOLTAGE FLA setting, or if the reduced voltage
timer expires, a transition is initiated by asserting the REDUCED VOLT CTRL operand for one second. Any contact output
assigned to this control signal operates for this period of time.
• “Current And Timer” — A transition is initiated by asserting the REDUCED VOLT CTRL operand for one second when the
reduced voltage timer expires and the motor load has dropped below the
REDUCED VOLTAGE FLA setting prior to the
expiration of the reduced voltage timer. If the reduced voltage timer expires prior to the motor load dropping below
the
REDUCED VOLTAGE FLA setting, the REDUCED VOLT CTRL operand does not change state and the REDUCED VOLT OP
operand is asserted.
REDUCED VOLT FLA — This setting specifies the current level used when determining the transition mode and initiating the
REDUCED VOLT CTRL operand. Set it greater than the product of the
MOTOR FULL LOAD AMPS setting and the MOTOR OVERLOAD
FACTOR
setting. See the Motor section under the SETTINGS  SYSTEM SETUP  MOTOR menu for details.
All FlexLogic operands are asserted upon the initiation of a motor start. The REDUCED VOLT OP operand is set when
the transition timer expires if the motor load never exceeds the
REDUCED VOLT FLA setting and the motor status is
starting. The REDUCED VOLT CTRL operand is set when the transition timer expires and the motor load has dropped
below the motor full load current setting; that is, the motor status is not starting.