Instructional Booklet
Page
24
Effective: March 2010
Instructions for Installation, Operation and Maintenance of the
Eaton ATC-600 Automatic Transfer Switch Controller
For more information visit: www.eaton.com
IB ATS-1005
6.3 Problem Solving
This section explains basic troubleshooting for Magnum Breaker
Transfer Switches. A basic problem solving effort is the first step
to take prior to calling for assistance. Frequently, the effort will
successfully address most problems encountered. The problem
solving procedure is presented in the following paragraphs as
observed Problem Symptoms and one or more possible Solution
Steps. All of the steps presented may not apply to all transfer
switches, depending upon the logic. Remember, only qualified
individuals familiar with the transfer switch equipment and the
system in which it is applied should attempt these problem solving
procedures.
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 informa-
tion required to properly address the need:
1. Shop Order Number (SO#) or General Order Number (GO#) of
transfer switch, plus related Item Number
2. Catalog and/or Style Number of 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
7. Any results of problem solving steps taken and/or readings
taken
6.3.1 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 NOR-
MAL 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 defective com-
ponents after the cause is determined.
Step 5:
Press the push-to-close button on the normal switching
device. Verify whether or not the system voltage now
appears on the load terminals.
If YES: Proceed to check logic for problems in respective
logic instruction book.
If NO: Check all power connections and the switching
mechanism.
6.3.2 Transfer Switch Will Not Automatically Transfer To Normal
Step 1:
Is Option 29 installed? If so, there would be a pushbutton
labeled “Manual Transfer to Normal.”
If YES: STOP! The transfer switch must be
MANUALLY transferred to NORMAL by
depressing the pushbutton.
If NO: Proceed to Step 2.
Step 2:
Is Option 9B installed? If so, there would be a selector
switch labeled “Maintenance.”
If YES: Verify selector switch is in the “Operate”
position.
If NO: Proceed to Step 3.
Step 3:
Are the correct line voltage and frequency available at ter-
minals N1, N2 and N3? Record the readings.
If YES: Proceed to Step 4.
If NO: Check NORMAL source
Step 4:
Is the voltage selector plug in the correct position?
If YES: Proceed to Step 5.
If NO: Position plug correctly.
Step 5:
Check the voltage on transformer NT1 by measuring volt-
age between voting relay KV-1 and GND. Is the voltage
measured 120 Vac (+/- 10 volts)? Record the reading.
If YES: Proceed to Step 6.
If NO: Check voltage transformer NT1.
WARNING
HAZARDOUS VOLTAGES IN AND AROUND TRANSFER SWITCH
EQUIPMENT DURING THE PROBLEM SOLVING PROCESS CAN
CAUSE PERSONAL INJURY AND/OR DEATH. AVOID CONTACT
WITH ANY VOLTAGE SOURCE WHILE PROBLEM SOLVING.
WARNING
ONLY PROPERLY TRAINED PERSONNEL FAMILIAR WITH THE
TRANSFER SWITCH EQUIPMENT AND ITS ASSOCIATED EQUIP-
MENT SHOULD BE PERMITTED TO PERFORM THE PROBLEM SOLV-
ING FUNCTION. IF AN INDIVIDUAL DOES NOT FEEL QUALIFIED TO
PERFORM THE PROBLEM SOLVING FUNCTION, THE INDIVIDUAL
SHOULD NOT ATTEMPT TO PERFORM ANY OF THESE PROCE-
DURES.