ABB DPU 1500R Instruction Book page 82

ABB Distribution Protection Unit 1500R
Table 6-1: Logical Input Definitions (cont.)
ARCI:
52A:
(XO)
52B:
(XI)
43A:
(AR)
SEF
>)
(IO /
SEF Model Only
Local
SIA
TGT
6-4
Automatic Reclose Inhibit. This logical input stops the recloser open timer for the time in which
it is a logical 1. When ARCI is returned to a logical 0 the open timer will continue where it was
stopped. ARCI does not affect the recloser reset timer. ARCI defaults to a logical 0 (disabled)
when not connected to a physical input or feedback term.
Breaker Position Input. Assign this input to the physical input that is connected to the circuit
breaker 52A auxiliary contact. The DPU1500R requires this input along with the 52B logical
input (except when in the MDT mode) to determine circuit breaker states for initiation of circuit
breaker close, trip failure, and close failure logical outputs. When 52A is a logical 1 and 52B is
a logical 0, the relay logic assumes a closed circuit breaker. When 52A is a logical 0 and 52B
is a logical 1, the relay logic assumes an open circuit breaker. If the 52A and 52B are at equal
logic states, the DPU1500R will determine a "CB Status Unknown" state as displayed on the
front panel MMI LCD display. 52A defaults to a logical 0 when not assigned to a physical input.
Breaker Position Input. Assign this input to the physical input that is connected to the circuit
breaker 52B auxiliary contact. The DPU1500R requires this input along with the 52A logical
input (except when in the MDT mode) to determine circuit breaker states for initiation of circuit
breaker close, trip failure, and close failure logical outputs. See 52A for valid breaker operating
states. 52B defaults to a logical 0 when not assigned to a physical input.
Recloser Enable. This input is used to supervise the DPU1500R reclosing function. When the
43A input is a logical 1, the DPU1500R recloser is enabled. When 43A is a logical 0, the
recloser is disabled. If the recloser is disabled, a red "Recloser Out" target will illuminate on the
front of the DPU1500R. 43A defaults to a logical 1 (enabled) when not assigned to a physical
input.
SEF: Sensitive Earth Fault Enable. Enables the sensitive earth fault function (available in
Sensitive Earth Fault models only). Use to supervise (torque control) the SEF overcurrent
element. When the SEF input is a logical 1, the SEF overcurrent protection is enabled.
SEF defaults to a logical 1 (enabled) if not assigned to a physical input or feedback term.
When this function is unmapped, or a logical 0, the relay functions normally. When this is set to
a logical 1, then the relay will not perform any functions listed in the operations record via
SCADA or any communications program. However, the operations record is always available
for use via the MMI.
Resets seal-in alarms
Resets target LEDs
website:www.abb.com/papd Programmable Input and Output Contacts
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