14
ABB IB 6.2.15.7-1C
C
ONTROL
S
CHEME
:
ADVAC™ circuit breakers are available with two control packages. The standard package (see Appendix D)
includes charge, close, and open functions, and 4a and 4b auxiliary contacts for customer use. The optional
package (see Appendix D) adds to the standard package 5a and 4b auxiliary contacts for customer use as well
as an optional second open coil and/or under voltage (UV) open/trip device if required. Refer to wiring diagrams
in Appendix D and Figure 3: Sequence of Operation.
1. Initial State
a. Closing Spring Discharged (33LSa Open/33LSb Closed)
b. Breaker Open (52a Open/52b Closed)
2. Upon available control power
a. Secondary engaged
b. Motor charges through 33LSb
3. Closing spring charged
a. 33LSa closes
b. 33LSb opens (removing control power to motor)
c. Breaker ready to close
4. Electrical control pulse sent to close circuit
a. Current energizes Close Coil 52X (Close Coil is not rated for continuous duty)
•
Coil rotates half shaft and closes breaker
– 52a closes – 52b opens
•
Coil de-energizes with release of signal and as 52b opens
b. Current energizes 52TC (Trip Coil is not rated for continuous duty)
•
52TCa closes
•
52TCb opens
c. Closing Spring Discharges
•
33LSa closes
•
33LSb opens
d. Closing Spring charges
•
33LSa closes
•
33LSb opens (removing control power to motor)
•
Breaker ready to perform O-C-O operation
MECHANISM AND OPERATION
