Eaton 380 VCP-Wind Instructions For The Use, Operation And Maintenance

Contents

Page 22 I.B. 70A2580H02Effective November 2012The circuit breaker secondary connection is automaticallyconnected to the enclosure secondary connectors whenthe circuit breaker is moved from DISCONNECT to theTEST position and remains connected until the circuitbreaker is returned to the DISCONNECT position.Verify the secondary connection by observing thealignment of the indicator slot with the front edge of thesecondary shroud. (See Figure 5-6). If the slot is notaligned, pull the cell secondary arm toward you to makethe connection.5-4.3 SECONDARY TERMINAL CONNECTIONSVCP-Wind circuit breakers are supplied with two 30-pointpin type secondary control terminals. A number of pointsare used for breaker operation with a number of sparecontacts for customer use. The terminals are located atthe upper left of the circuit breaker Figure (5-6). Whenthe breaker is in the TEST position, confirmSecondaries are connected by checking the indicatorslot on the Manual Connect Bracket, it should bebeyond the metal shrouds outside edge surface Figure(5-6).5-4.4 UNDERVOLTAGE TRIP DEVICEThe under voltage trip device for VCP-Wind circuitbreakers is an electromechanical device that operates toopen the circuit breaker at 30% or less of the voltagerating of the trip coil. The device does not open the circuitbreaker at values above 60% of the voltage rating of itstrip coil. It may operate, however, to open the circuitbreaker when the voltage across the trip coil is greaterthan 30%, but less than 60% of the voltage rating of itstrip coil. The circuit breaker can be closed as long as thevoltage to the trip coil is maintained at 85% or above therated level. The under voltage trip device is available onlyas an instantaneous type with rated voltages of 48VDC, 125VDC, 250VDC 120VAC and 240VAC.Table 5.1 Circuit Breaker TimingEvent Milliseconds (maximum)Closing Time(From Initiation of CloseSignal to Contact Make)75Opening Time(Initiation of Trip Signalto Contact Make)45Reclosing Time(Initiation of Trip Signalto Contact Make)190For a basic understanding of the operation of theunder-voltage trip device refer to the specific itemsidentified in Figure 5-9 and the following operationdescription.1. With the circuit breaker closed and sufficientvoltage on the Under voltage Trip Device coil, themoving clapper (1) is held to the stationary yoke(2) by the magnetic force produced by the coil (3)against the extension springs (4) pulling themoving clapper apart from the yoke.2. The moving clapper is connected to themechanism Trip D Shaft Lever (5) by a slottedlink (6).3. When the voltage to the Under voltage Trip Coilgoes down as described earlier, the extensionsprings force overcomes the reduced magneticforce and pulls the moving clapper up. The slottedlink in turn upsets the Trip D Shaft and the circuitbreaker trips open.4. As the circuit breaker opens, the reset lever (8)connected to the pole shaft lever (7) operates toreset the moving clapper. As long as the circuitbreaker remains open, the reset lever holds downthe moving clapper to the yoke.Figure 5-6 Secondary Plug Shown Mounted on Top ofDrawout Circuit Breaker (top) & in Mini-Mod (bottom)