GE 869 - Page 298

4–166 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION CHAPTER 4: SETPOINTS
Figure 4-59: Acceleration Time logic diagram
89$1.cdr
SETPOINT
Configurable FUNCTION:
Disabled=0
Trip Alarm
Latched Alarm
OR
SETPOINT
BLOCK:
Off=0
AND
RUN
TIME:
SETPOINT
AND AND AND
Operate Output
Relay 1(TRIP)
LED: TRIP
OR
LED: ALARM
LATCH
S R
RESET
Command
FLEXLOGIC OPERAND
Motor Accel Time OP
SETPOINT
Output Relay X
Do Not Operate, Operate
Motor Stopped
FLEXLOGIC OPERAND
SETPOINT
Mode:
Definite Time
Adaptive
RUN
CURRENT:
T > ACCELERATION TIME
I
2
T > CURRENT
2
* TIME
Calculate: Peak acceleration current Effective acceleration current Acceleration time
IA mag IB mag IC mag
Phase Currents Magnitude
from Phase Current CT bank
MAX
OR
Start Time
RECORDS
Start Date
Start Effective Current Start Acceleration Time
Start Peak Current
Motor Starting
FLEXLOGIC OPERAND
Motor Running