Page 8-11
IL17569
Effective June, 2001
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 Breaker State Alarm below). 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.
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 Breaker Close
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. 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).
• Contact input programmed to Remote Close.
By using the FP-5000 to close the breaker, the following advantages
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 Time).
• 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 Time) is active.
8.9.3 Breaker Open
The FP-5000 has been designed to issue an open breaker signal
from one of its programmable contact outputs. The default
configuration maps the Open Breaker function to contact output
relay Trip 1. This relay can be made to operate for 30 line cycles
after the removal of the opening signal. The Open Breaker function
can be initiated from different sources:
• Front panel Open Breaker pushbutton, if enabled by System
Configuration “Bkr Operation PB” setting (see Section 4.2).
• Test menu Open Breaker function.
• Communication Open Breaker command, if enabled by System
Configuration “Remote Bkr” setting (see Section 4.2).
• Contact input programmed to Remote Open.
By using the FP-5000 to open the breaker, the following advantages
of built-in logic are obtained:
• A slow breaker alarm is raised if the breaker opens too slowly (see
8.9.8 Slow Breaker Time).
• If the faceplate pushbutton is used, a warning message is given
if already in the open 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 Time) is active.
8.9.4 Breaker Trip and Open Coil Supervision
The FP-5000 includes optional Trip Coil Supervision on the Trip 1
output relay and Close Coil Supervision on the Trip 2 output relay.
When the coil supervision alarm activates, it indicates wiring to a
coil or the coil itself has an electrical open circuit.
In the case of Trip Coil Supervision, a trickle current is sensed
across the Trip 1 relay output contacts whenever the breaker state
is closed and the Trip 1 relay is open. Since the state of the breaker
must be known, this function is operational only if at least one
contact input is configured as 52a or 52b. In addition, the Trip 1
relay Monitor setting must be set to “On” and one of the inputs set
to “Breaker, OpenBkr” (see Section 4.2). By default, if this alarm
should occur the alarm contact output relay will close.
WARNING
IF THE TRIP 1 MONITOR ALARM IS ACTIVE, THIS IS AN
INDICATION THAT THE TRIP CIRCUIT MIGHT NOT BE ABLE TO
OPEN THE BREAKER IF A FAULT SHOULD OCCUR. IMMEDIATE
INVESTIGATION OF THE CIRCUIT SHOULD BE PERFORMED.
In the case of Close Coil Supervision, a trickle current is sensed
across the Trip 2 relay output contacts whenever the breaker state
is open and the Trip 2 relay is open. Since the state of the breaker
must be known this function is operational only if at least one
contact input is configured as 52a or 52b. In addition, the Trip 2
relay Monitor setting must be set to “On” and one of the inputs set
to “Breaker, CloseBkr” (see Section 4.2). By default, if this alarm
should occur the alarm contact output relay will close. If the Trip 2
Monitor Alarm is active, this is an indication that the close breaker
circuit might not be able to close the breaker, if so desired.
Summary of Contents for Cutler-Hammer FP-5000
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