Eaton Electrical Magnum Transfer Switch manual Transfer Switch Appears Inoperative

Fixed and Drawout Magnum Transfer Switches

If a problem persists after having completed the problem solving procedure, contact an Eaton representative for further assistance. When calling for assistance, the following is the MINIMUM infor- mation required to properly address the need:

1.Shop Order Number (SO #) or General Order Number (GO #) of the transfer switch, plus related Item Number;

2.Catalog and/or Style Number of the transfer switch;

3.Actual location of transfer switch (type of facility, address, etc.);

4.Company name;

5.Name and position of individual representing company;

6.Basic description of situation as it exists; and

7.Any results of problem solving steps taken and/or readings taken.

WARNING

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

8.2.1 Transfer Switch Appears Inoperative

Step 1: Verify that all plugs and sockets are properly intercon- nected.

Step 2: Verify that the correct system voltage appears at Source 1 switch. Measure the voltage at the breaker lugs.

Step 3: Verify that the voltage selection plug is in the proper posi- tion to match the system voltage.

Step 4: Look for any obviously burned components. Determine the cause and rectify, if possible. Replace any defective components after the cause is determined.

Step 5: For closed transition, refer to Figure 25 for manual oper- ating instructions. Verify whether or not the system volt- age now appears on the load terminals.

If YES: Check the logic for problems in the respective logic instruction book.

If NO: Check all power connections and the switching mechanism.

Step 5: For open transition, press the Push-To-Close button on the Source 1 switching device. Verify whether or not the system voltage now appears on the load terminals.

If YES: Check the logic for problems in the respective logic instruction book.

If NO: Check all power connections and the switching mechanism.

8.2.2Transfer Switch Will Not Automatically Transfer to Source 1

Step 1: Check for the proper line voltage on N1, N2, and N3.

Step 2: Is the Source 1 switching device charged? If YES: Continue with the other procedures.

If NO: Go through section 8.2.4 first before continuing.

Step 3: Is the Source 2 switch OPEN? If YES: Proceed to Step 5. If NO: Proceed to Step 4.

Step 4: Measure the voltage between terminals S2B1O and S2B11 on the Source 2 switching device (shunt trip). Does the voltage measure 120 Vac ±10 volts? Record the reading.

If YES: Check the shunt trip in the Source 2 switch.

If NO: Check the wiring to S2B10 and S2B11.

Step 5: Measure the voltage between terminals S1B12 and S1B13 on the Source 1 switching device (spring release coil). Does the voltage measure 120 Vac ± 10 volts? Record the reading.

If YES: Check the spring release coil in Source 1 switch- ing device.

If NO: Check the wiring to S1B12 and S1B13.

8.2.3Transfer Switch Will Not Automatically Transfer to Source 2

Step 1: Check for the proper line voltage on E1, E2, and E3.

Step 2: Is the Source 2 switching device charged? If YES: Continue with the other procedures.

If NO: Go through Section 8.2.4 first before continuing.

Step 3: Is the Source 1 switching device OPEN? If YES: Proceed to Step 5.

If NO: Proceed to Step 4.

Step 4: Measure the voltage between terminals S1B10 and S1B11 on the Source 1 switching device (shunt trip). Does the voltage measure 120 Vac ± 10 volts? Record the reading.

If YES: Check the shunt trip in the Source 1 switch.

If NO: Check the wiring to S1B10 and S1B11.

Step 5: Measure the voltage between terminals S2B12 and S2B13 on the Source 2 switching device (spring release coil). Does the voltage measure 120 Vac+ 10 volts? Record the reading.

If YES: Check the spring release coil in Source 2 switch.

If NO: Check the wiring to S2B12 and S2B13.

8.2.4 Transfer Switch Will Not Automatically Recharge Switches

Step 1: Measure the voltage between terminals B15 and B14 on the switching device that does not automatically recharge. Does the voltage read 120 Vac + 10 volts? Record the reading.

If YES: Check the electrical operator inside the switching device.

If NO: Verify the wiring to B15 and B14.

Step 2: If problem persists, contact Eaton.