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IB140015EN
Instructional Booklet
Page
32
Effective: August 2014
ATC-900 Magnum Tranfer Switch O & M Manual
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. 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.
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.
8.2.2 Transfer 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.
8.2.3 Transfer 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.
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.
Eaton Care for assistance
877-386-2273 option 2, option 4, and then option 3
