IL17569C
Page 8-12
FP-5000
Effective Date: 12/05
Page 8-12
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Effective Date: 12/05
8.9 Breaker-Oriented Functions
8.9.1 Breaker State
Circuit breakers typically have both a 52a contact and a 52b contact.
The FP-5000 reports breaker state based on either one or both of
these inputs. It is recommended that both be used. When both are
used the FP-5000 can alarm if a conflict between the two signals
exists (see section 8.9.6 Breaker State Alarm). By default, Contact
Input 1 is configured as 52a and Contact Input 2 as 52b, but any of
the eight contact inputs can be configured as inputs to read the 52a
or 52b breaker contact outputs. Never configure more than one input
to be 52a or 52b (see figure 8.12 below).
When the breaker is closed, the 52a breaker contact output is closed
and the 52b breaker output is open.
When the breaker is open, the 52a breaker contact output is open
and the 52b breaker output is closed.
The “Breaker Closed” and “Breaker Open” LEDs on the front face
panel are only operational if at least one contact input is programmed
to be 52a or 52b. The “Breaker Closed” LED will light when the 52a
contact input is on and/or the 52b contact is off. The “Breaker Open”
LED will light when the 52a contact input is off and/or the 52b
contact is on.
8.9.2 Close Breaker
The FP-5000 has been designed to issue a close breaker signal
from one of its programmable contact outputs. The default
configuration maps the Close Breaker function to contact output
relay 5 (see figure 8.13). This relay can be made to operate for 45
line cycles when commanded, giving a pulsed on function. The
Close Breaker function can be initiated from four different sources:
• Front panel Close Breaker pushbutton, if enabled by System
Configuration “Bkr Operation PB” setting (see Section 5).
• Test menu Close Breaker function.
• Communication Close Breaker command, if enabled by System
Configuration “Remote Bkr” setting (see Section 5.4.1).
• Contact input programmed to Remote Close.
By using the FP-5000 to close the breaker, the following advan-
tages of built-in logic are obtained:
• Close signal is prevented after breaker failure (see 8.9.5 Breaker
Failure).
• Close signal is prevented while the FP-5000 Trip 1 output
relay is active.
• Closed signal is prevented if the configured input Breaker Trouble
is active (see 8.9.7 Breaker Trouble).
• Closed signal is prevented if the breaker is already in
the closed state.
• Closed signal is prevented if the open signal is being requested.
• A slow breaker alarm is raised if the breaker closes too slowly
(see 8.9.8 Slow Breaker Alarm).
• If the faceplate pushbutton is used, a warning message is
given if already in the closed state or a breaker state alarm (see
8.9.6 Breaker State Alarm) is active, or a slow breaker alarm (see
8.9.8 Slow Breaker Alarm) is active.
8.9.3 Open Breaker
The FP-5000 has been designed to issue an open breaker signal
from one of its programmable contact outputs. The default
Figure 8-12. Breaker Monitoring (Times in cycles unless stated otherwise)
