GE MI-869 Instruction Manual page 449

CHAPTER 4: SETPOINTS
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 4-135: Reduced Voltage Starting wiring example
Path:
Setpoints > Control > Motor Starting > Reduced Voltage Start
FUNCTION
Range: Disabled, Trip, Configurable
Default: Disabled
CONTROL OUTPUT RELAY
Range: Do Not Operate, Operate
Default: Do Not Operate
Any assignable output relay can be selected to operate upon Reduced Volt Ctrl.
TRANSITION MODE
Range: Current Only, Current or Timer, Current and Timer
Default: Current Only
"Current Only": When the motor load falls below the Start Current Level setting prior to
the expiration of the Start Timer, a transition will be initiated by asserting the Reduced
Volt Ctrl operand for a period of one second. Any contact output assigned to this
operand will operate for this period of time. If the reduced voltage Start Timer expires
prior to the motor load dropping below the Start Current Level setting, the Reduced Volt
Ctrl operand does not change state and the Reduced Volt Fail operand is asserted.
"Current Or Timer": When the motor load falls below the Start Current Level setting, or if
the reduced voltage Start Timer expires, a transition will be initiated by asserting the
Reduced Volt Ctrl operand for one second. Any contact output assigned to this control
signal will operate for this period of time.
"Current And Timer": A transition will be initiated by asserting the Reduced Volt Ctrl
operand for one second when the reduced voltage Start Timer expires and the motor
load has dropped below the Start Current Level setting prior to the expiration of the
reduced voltage timer. If the reduced voltage timer expires prior to the motor load
dropping below the Start Current Level setting, the Reduced Volt Ctrl operand does not
change state and the Reduced Volt Fail operand is asserted.
START LEVEL CURRENT
Range: 0.25 to 3.00 x FLA in steps of 0.01
Default: 1.25 x FLA
Motor current has to drop below the value selected here to initialize the transition. This
applies if "Current Only" or "Current or Timer" was selected.
CONTROL
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