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9/99
Table 6-2: Logical Output Definitions (cont).
BFT:
BFT*:
ReTrp:
ReTrp*:
SBA
I>0
I>0*
BZA
79V (O->IU<)
RClin
Output Contacts
The relay output contacts are divided into two categories: permanently programmed and user-programmable. Jumpers on
the CPU board allow you to choose whether the programmable output contacts are normally open or normally closed.
Permanently Programmed Output Contacts
MASTER TRIP—The trip output contact is actuated by the enabled protective functions. The trip output remains
closed until the fault current is removed (less than 5% of the 51P (3I>) and 51N (IN>) pickup settings) and until the
52a (XO) and 52b (XI) contact inputs indicate that the breaker has opened.
If Multiple Device Trip Mode is enabled, the trip output is removed 3 cycles after the fault current drops below 90%
of the lowest pickup setting; removal of the trip output is not dependent on the 52a (XO) and 52b (XI) contact inputs.
If Multiple Device Trip Mode is enabled, the open interval timer and subsequent close output are initiated only if an
Overcurrent Trip Output has occurred and the current has dropped below 90% of the lowest pickup setting. Initiation
of the open interval timer and the subsequent close output is not dependent on the 52a (XO) and 52b (XI) contact
inputs.
ALARM—Self-check alarm output contacts, one normally open and one normally closed, change state when control
power is applied. Upon a loss of control power or a failure status of a specific self-test, the contacts return to their
normal state. A contact must be connected to a local annunciator light or, if available, to a remote terminal unit to
indicate the need for relay replacement.
Programmable Input and Output Contacts
Breaker Failure Trip. Operates when the stand alone Breaker Failure Trip function in the
DPU1500R issues a breaker failure trip.
Breaker Failure Trip Seal-in Alarm. See "Logical Output Types" earlier in this section.
Breaker Failure ReTrip. Operates when the stand alone Breaker Failure Trip function in the
DPU1500R issues a ReTrip.
Breaker Failure ReTrip Seal-in Alarm. See "Logical Output Types" earlier in this section.
Slow Breaker Alarm function. This indicates that the "Slow Breaker Time" setting in the
configuration settings has expired.
Sensitive Earth Fault Trip
Sensitive Earth Fault Trip Seal-in Alarm
Bus Zone Alarm
Reclose undervoltage block. When this logical output is asserted, it indicates that the system
voltage is less than the 79V setting and the 79 function is suspended. When the system
voltage recovers abot the 79V setting for the 79V time delay, this logical output will reset and
the 79V will continue.
Circuit Breaker Close initiate.
ABB Distribution Protection Unit 1500R
website:www.abb.com/papd
6-11
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