GE MI-869 - Page 193

CHAPTER 4: SETPOINTS SYSTEM
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–75
Figure 4-16: VFD Logic
89$1.cdr
Bypass Switch:
Setpoint
FUNCTION:
Setpoint
Off=0
AND
Motor Stopped=1
FLEXLOGIC OPERAND
Enabled=1
AND
VFD Bypassed
FLEXLOGIC OPERAND
VFD Not Bypassed
FLEXLOGIC OPERAND
Motor Starting = 1
FLEXLOGIC OPERAND
AND
Starting Frequency:
Setpoint
Selection of Frequency Tracking Source
1 0
IA IB IC
Phase Input Currents from CT Bank
VA VB VC
Phase Input Voltages from VT Bank
1
0
Frequency
Measurement &
Tracking
Nominal Frequency
Setpoint
From System/Power System