Eaton Electrical Magnum Transfer Switch manual Operation, Wiring, Engine Start Connection

Instructional Booklet

Page 20 Effective: March 2007

Fixed and Drawout Magnum Transfer Switches

CAUTION

IT IS IMPORTANT TO TAKE GREAT CARE WHEN PLACING A DRA- WOUT CIRCUIT BREAKER ON ITS EXTENSION RAILS. IF THE CIR- CUIT BREAKER IS NOT PROPERLY SEATED ON THE EXTENSION RAILS, IT COULD FALL FROM THE RAILS CAUSING EQUIPMENT DAMAGE AND/OR BODILY INJURY.

Carefully lower the circuit breaker down onto the extension rails. Be certain that the circuit breaker’s four molded drawout rail sup- ports are fully seated in the extension rail cutouts on both sides (Figure 22). Do not remove the lifting yoke from the circuit breaker until it is properly seated on the rails.

Once the circuit breaker is on the extension rails and the lifting yoke is removed, proceed with the rest of the circuit breaker installation.

4.8 Wiring

Section 5: Operation

5.1 General

WARNING

THE CLOSED TRANSITION PRODUCT CONTAINS A SPECIAL CON- TACT ARRANGEMENT (OVERLAPPING CONTACTS). MISUSE CAN RESULT IN DEATH, SEVERE PERSONAL INJURY, AND/OR PROPERTY DAMAGE.

A transfer switch provides main contacts to connect and discon- nect the load to and from the Source 1 and Source 2 power sources. A stored-energy type transfer mechanism provides the mechanical motion required to open and close the main contacts (Paragraph 3.2.1).

Each switch can be manually operated. Before a switching device can be closed, the stored energy mechanism must be charged by pumping the handle (Figure 23).

CAUTION

POWER CONDUCTORS AND CONTROL WIRING MAY HAVE VOLT- AGE PRESENT THAT CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. DE-ENERGIZE ALL POWER OR CONTROL CIRCUIT CONDUC- TORS BEFORE BEGINNING TO PERFORM ANY WIRING ACTIVITY TO OR WITHIN THE TRANSFER SWITCH EQUIPMENT.

Power sources, load conductors, and control wiring should be connected to locations as indicated in the Customer Wiring Dia- grams supplied with the transfer switch equipment.

4.8.1 Engine Start Connection

The engine control contact connections are located on the ATC-600/ATC 800 Controller. The engine control contact con- nections of bypass isolation units are located in the door of the enclosure

Note: Prior to making the engine start connection to the switch on bypass isolation units, set the engine generator controls selector switch in the OFF position to prevent an unwanted engine start. A contact closes between these terminal blocks when an engine start signal is provided by the ATS logic.

4.8.2 ALARM CONTACTS (CLOSED TRANSITION ONLY)

Closed transition only ATSs are provided with an extra shunt trip on the Source 1 device. This shunt trip is energized when the Time Delay Utility Parallel (TDUP) times out (preset by user), thus opening the source device. The TDUP timer starts timing when both sources are paralleled. Refer to the IQ Transfer instruction book for additional alarms.

Figure 23. Pumping Handle Charges Stored Energy Mechanism (Closed Transition Shown).

In the closed transition product, a single switching device can be manually closed by following the instructions detailed in Figure

25.An indicator window shows whether the switch is open or closed.

The open transition switching device can be closed by pushing the close button (Figure 24). The other switching device is prevented from closing through a rigid mechanical interlock (Paragraph 3.2.2). An indicator window shows whether the switch is open or closed.

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