GE 869 Instruction Manual page 544

MOTOR
NOTE:
NOTE:
5–6
will be maintained for 1 second. After 1 sec, if motor current is detected less than FLA x
OL setting, the Motor Running operand will remain maintained, otherwise either the
Overload or Stopped condition will be declared.
During transition from speed 2 to speed 1, if the previous status is Running (Starting or
Overload) and 2-Speed Motor Protection is "Enabled" and Speed2 Motor Switch is true,
then the motor status (Motor Running, Starting or Overload) will be maintained for
Speed2 Switch 2-1 Delay + 1 second.
In synchronous motors, an idling condition results in the current ideally equal to zero
during motor running condition, this can result in the Motor Stopped condition instead of
Motor Running. To prevent this, it is strongly recommended that the 869 is always
programmed to monitor the status of the switching device by means of contact input of
the relay.
MOTOR THERMAL CAPACITY USED
Range: 0 to 100%
Default: 0%
The Thermal Capacity Used value is continuously calculated and displayed when the
thermal model element is enabled. When RTD Bias is enabled, this value shows the
biased thermal capacity used.
ESTIMATED TRIP TIME on OL
Range: 0 to 65000 s in steps of 1
Default: 0 s
The Estimated Time to Trip on OL is displayed when the motor is Starting, Running or in
Overload condition. This value represents the estimated time to trip (in seconds) from the
thermal model assuming that the motor current remains at its current level. It is
obtained from the thermal model curve and takes into account that some percent of the
thermal capacity has already been used. When RTD Bias is enabled, Estimated Trip Time
on OL will take into account biased thermal capacity used.
The Start Inhibit lockout times (four values: Thermal Lockout, Max Start Rate, Time Btwn
Starts, and Restart Delay) are constantly displayed regardless of the motor status. The
times continuously decrease and when any value reaches zero, the respective lockout is
removed.
Thermal Lockout Time
Range: 0 to 65000 s
Max Start Rate LO Time
Range: 0 to 65000 s
Time Btwn Starts LO Time
Range: 0 to 65000 s
Restart Delay LO Time
Range: 0 to 65000 s
Total Motor Lockout Time
Range: 0 to 65000 s
The Total Motor Lockout Time displays the highest value of all calculated Start Inhibit
lockout times: Thermal, Maximum Starting Rate, Time Between Starts and Restart Delay.
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: STATUS