GE MI-869 - Page 424

4–306 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
MONITORING CHAPTER 4: SETPOINTS
Figure 4-119: Harmonic Detection logic diagram
894001$1.cdr
LED: PICKUP
SETPOINT
BLOCK : Off=0
AND
SETPOINT
FUNCTION : Disabled Alarm Latched Alarm Configurable
OR
SETPOINT
PICKUP : HMA ≥ PICKUP RUN
SETPOINT
PICKUP DELAY : t
PKP
0
Harm Det 1 OP
FlexLogic Operands
Harm Det 1 PKP
AND AN D
Command
RESET
OR
LED: ALARM
SETPOINT
MINIMUM OPER CURRENT : IA ≥ MINIMUM RUN
S
LATCH
Set-
Dominant
R
Phase A Current (IA) Phase B Current (IB)
Phase C Current (IC)
Phase A HM (HMA) Phase B HM (HMB)
Phase C HM (HMC)
IB ≥ MINIMUM IC ≥ MINIMUM
HMB ≥ PICKUP RUN HMC ≥ PICKUP RUN
SETPOINT
OUTPUT RELAYS 1(X): Do Not Operate , Operate
SETPOINT
INPUT :
SETPOINT
HARMONIC :
Average HM (HMavg)
Average Current (Iavg ) Iavg ≥ MINIMUM
HMavg ≥ PICKUP RUN
SETPOINT
PHASES FOR OPERATION : ANY ONE : At least one phase picked up ; ANY TWO: Two or more phases picked up; ALL THREE: All three phases picked up; AVERAGE: Average value picked up.