GE MI-869

CHAPTER 4: SETPOINTS CONTROL
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–329
Restart Delay The Restart Delay feature is used to ensure that a certain amount of time passes between
the time a motor is stopped and the restarting of that motor. This timer feature can be very
useful for some process applications or motor considerations. If a motor is on a down-hole
pump, after the motor stops, the liquid can fall back down the pipe and spin the rotor
backwards. It is very undesirable to start the motor at this time.
The Restart Delay inhibit lockout will remain active (it may be used as a backspin timer)
when the Emer
gency Restart input is asserted.
The status of the Restart Delay element (including the time) is stored into a non-volatile
memory
and remains in the memory after the power is removed from the 869. When the
power is restored, the Restart Delay element continues working normally using the
information collected before the power loss if the real time clock worked properly during
the power loss.
Path:
Setpoints > Control > Motor Starting > Start Supervision > Restart Delay
FUNCTION
Default: Disabled
Range: Disabled, Enabled
MINIMUM TIME
Range: 0 to 65000 s in steps of 1s
Default: 0 s
Sets the amount of time following stop before a start control is permitted.
EVENTS
Range: Disabled, Enabled
Default: Enabled
TARGETS
Range: Disabled, Self-reset, Latched
Default: Latched
Figure 4-132: Restart Delay logic diagram
894087A2.cdr
FLEXLOGIC OPERANDS
Restart Delay PKP
Function
SETPOINT
Enabled = 1
SETPOINT
FLEXLOGIC OPERANDS
Minimum Time
Restart Delay OP
ACTUAL VALUES
Restart Delay LO Time
Emergency Restart
FLEXLOGIC OPERAND
STATUS
Timer Reset
FLEXLOGIC OPERANDS
AND
Tmin
0
AND
LED: Start
Inhibit
Motor Stopped
Motor Tripped
OR
FLEXLOGIC OPERANDS
Start Inhibit