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Recloser Logical Inputs
The following are the programmable logic inputs associated with the recloser. They may help in unique reclosing
applications.
TARC:
Initiate Trip and Auto Reclose. This input is used to issue a circuit breaker trip and reclose. It is useful in the
testing of the circuit breaker trip and close circuits as well as the recloser logic and timing settings. When
TARC is a logical 1, a trip and automatic reclose sequence is initiated. If the input is held at a logical 1, the
DPU1500R will continue to trip and reclose through the recloser steps (79-1, 79-2, 79-3, etc., see Recloser
Section for reclosing details). If TARC is pulsed at a logical 1, the trip and auto reclose will only occur once
unless TARC is pulsed again. TARC defaults to a logical 0 when not assigned to a physical input or feedback
term.
ARCI:
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 when not connected to a physical input or
feedback term.
43A:
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
(AR)
recloser is disabled, a red "Recloser Out" target will illuminate on the front of the DPU1500R. 43A defaults
to a logical 0 when not assigned to a physical input.
79S:
Single Shot Reclosing. Enables a single shot of reclosing when the DPU1500R determines that an external
device has opened the circuit breaker. When 79S is a logical 1, single shot reclosing is enabled. 79S defaults
(O->I1)
to a logical 0 when not assigned to a physical input or feedback term.
79M:
Multi-Shot Reclosing. Enables a multi shot of reclosing when the DPU1500R determines that an external
(O->I)
device has opened the circuit breaker. When 79M is a logical 1, multi-shot reclosing is enabled. 79M
defaults to a logical 0 when not assigned to a physical input or feedback term.
ZSC:
Enables Zone Sequence Coordination scheme. Allows external supervision of the Zone Sequence
scheme. When the ZSC input is a logical 1, zone sequence is enabled. ZSC defaults to a logical 1 if not
assigned to a physical input or feedback term. See the Zone Sequence Section for more details.
SCC:
Spring Charging Contact. Connect SCC to a physical input to monitor a recloser spring. If the SCC input
is a logical 1, a "Spring Charging" event is logged in the operations record. SCC defaults to a logical 0
when not assigned to a physical input or feedback term. SCC only functions when the DPU1500R
determines a breaker open state.
Protective Functions
ABB Distribution Protection Unit 1500R
website:www.abb.com/papd
1-27
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