InteliATS
NT
PWR, SW version 2.5, ©ComAp – May 2015 57
IA-NT- PWR-2.5-Reference Guide.pdf
Step: 1 s
Range: 0 – 600 s
ConnectionType [3Ph4Wire / 3Ph3Wire / Split Ph / Mono Ph]
Generator winding connection.
3Ph4Wire: STAR Connection, 3 phases and neutral - 4 wires,
Three phase “wye” measurement – 3PY, 3x CT
3Ph3Wire: DELTA Connection, 3 Phase without neutral - 3 Wires,
Three phase “delta” measurement – 3PD, 3x CT
Split Phase: DOUBLE DELTA Connection, Split Phase,
Single-phase measurement – 1PH, 1xCT
Mono Phase: MONOPHASE,
Single-phase measurement – 1PH, 1x CT
CT Location [Load / GenSet]
Load: CT (current measurement) is located next to the load.
GenSet: CT (current measurement) is located next to the gen-set.
Transition [OPEN/INPHASE/CLOSED/INPH-OPEN/CLOS-OPEN]
Ability to perform passive synchronization dramatically enhances controller function and brings
possibility to provide Open In-phase Transition and Closed Transition (short time parallel). Controller
provides below described types of changeover between Mains and Gen-set power sources depending
on following setpoint value:
OPEN Open Delayed Transition
IN-PHASE Open In-phase Transition
CLOSED Closed Transition
INPH-OPEN Open In-phase Transition or Open Delayed Transition
CLOS-OPEN Closed Transition or Open Delayed Transition
1. Open Delayed Transition
Open Delayed Transition is standard type of changeover provided by most common AMF or ATS
controllers supplied by other vendors. Controllers perform load transfer between both power
sources with break (blackout). Delayed Transition means there is delay between source breaker
opening and target breaker closing.
Two or three position ATS switch or two independent breakers/contactors can be used as
switching mechanism.
Bellow you can see how is Open Delay Transition implemented by IA-NT controllers. Our
controllers offer possibility to setup load transfer delay via Transfer Del setpoint.
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