10: Solid State Tripping Contacts; 11: Signal Relays; 12: Detectors - ABB Arc Guard System TVOC-2 Installation And Maintenance Manual

10: Solid state
tripping contacts

11: Signal Relays

12: Detectors

The three solid state trip contacts, K4, K5 and K6 are used to trip the circuit
breakers.This will stop the energy from feeding the arc.
At normal condition:
• K4 Open, no arc detected
• K5 Open, no arc detected
• K6 Open, no arc detected
The Internal Relay Fault (IRF), K1 indicates the system status. At normal con-
dition the K1 is energized and signals that no diagnostics error is detected
on the Arc Guard System.
The two trip signal relays, K2 and K3 are used to signal when a trip occurs.
The relays can be used to activate an alarm or to pass the trip information to
a supervised system.
The signal relays are called K2 and K3.
• K2 de-energized, no arc detected
• K3 de-energized, no arc detected
If the system is configured for manual reset, K2 and K3 are energized until
the user is resets them on the Human Machine Interface (HMI) in the trip
notification window. If the system is configured for auto reset, K2 and K3 are
energized until the arc disappears.
The detectors are used to detect the intensive light from an arc and transfer
it to the Arc Guard System. The detectors are using fibre-optics and are
guaranteed that they will react on the correct light intensity. For this reason,
the cables are not to be modified in any way.
Arc Monitor functions
19