Monitoring - GE MI-869 Instruction Manual

CHAPTER 4: SETPOINTS

Monitoring

Level 1
Breaker
Trip and Close Circuit
Monitoring
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 4-96: Monitoring Display Hierarchy
Device
System
Inputs
Broken Rotor Bar
Outputs
Stator Inter-Turn Fault
Protection
Monitoring
Harmonic Detection
Control
Speed Protection
RTD Temperature
FlexLogic
Testing Loss of Communications
Level 2
The 869 relay provides Trip and Close Circuit Monitoring elements.
The first and second Form A relay outputs on slot "F" include a circuit to monitor the DC
voltage across the output contact when it is open. To do that, an external jumper is wired
between the terminals "FA_1 COM" and "FA_1 OPT/V" for the Trip coil monitoring, or/and
"FA_2 COM" and "FA_2 OPT/V" for the Close coil monitoring.
The monitor contains a level detector whose output is set to logic 1 (ON) when the voltage
is above 20 volts. The voltage monitor is used to check the health of the overall trip and
closing circuit.
The two figures below show the two different connections of the breaker trip and close
coils to the relay's trip and close output relays for either no voltage monitoring and for
voltage monitoring of the circuits.
Trip Circuit Monitoring
Close Circuit Monitoring
Breaker Arcing Current
Breaker
Breaker Health
Power Factor
Data Capture Functions
Demand
Data Capture
Pulsed Outputs
Data Capture
Digital Counters
Data Capture
Level 3
MONITORING
Level 5:
Current
Real Power
Reactive Power
Apparent Power
Level 4
4–259