9328900990 Rev L BE1-951 Reporting and Alarm Functions 6-21
Table 6-9 summarizes SB-DUTY command settings.
Table 6-9. Breaker Duty Monitoring Settings
Function Range/Purpose Default
Mode
0 = Disabled, 1 = I (enabled), 2 = I
2
(enabled)
0
100% Duty
Maximum
0 to 4.2e+7
The 100% Duty Maximum parameter represents the maximum duty that
the breaker contacts can withstand before needing service. 100% Duty
Maximum is programmed in primary amperes using exponential floating
point format.
0
Block
OR logic term (e.g., IN1 or VO7) that blocks the breaker monitoring logic
when TRUE (1). A setting of 0 disables blocking (breaker operations are
no longer counted).
0
Example 1. Make the following settings to your Breaker Duty Monitoring Settings. Refer to
Figure 6-7
and
Figure 6-8.
Exponent: 0
100% Duty Maximum: 0.000e+00
Block: IN4
Retrieving Breaker Duty Information
Breaker duty values can be read at HMI Screen 4.3.2. Duty values can be changed by using the front
panel Edit key. Write access to reports is required to edit breaker duty values. Duty values can also be
read or changed through the communication ports using the RB-DUTY command.
RB-DUTY Command
Purpose: Read or set the breaker contact duty log.
Syntax: RB-DUTY<phase>=<%duty>
Comments: phase = A, B or C. No entry for <phase> will read or write to all phases.
%duty = accumulated duty expressed in percent of DMAX (set by SB-DUTY command).
RB-DUTY Command Examples:
Example 1. Read all contact duty values.
>RB-DUTY
RB-DUTYA=92%; RB-DUTYB=23%; RB-DUTYC=28%
Example 2. Reset the A-phase duty after maintenance was performed.
>RB-DUTYA=0
Breaker Operate Time Monitoring
The breaker-operate time monitor tracks the time from when a trip output occurs (defined by the TRIP
logic expression) to when the fast dropout current detector observes that current is zero in all three
breaker poles. This time is reported as a line in the Fault Summary Reports. See the Fault Reporting sub-
section for more information about the TRIP logic expression and Fault Summary Reports.
Breaker operate time can be monitored to give an alarm when the value exceeds a threshold. The
following Breaker Alarms sub-section provides more information about this feature.
Breaker Alarms
Three alarm points are included in the programmable alarms for checking breaker monitoring functions.
Each alarm point can be programmed to monitor any of the three breaker monitoring functions,
operations counter, interruption duty, or clearing time. An alarm threshold can be programmed to monitor
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