Troubleshooting - Eaton Cutler-Hammer MP1 Series Instructions Manual

I.L.15.01.T.K.

11. Troubleshooting

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.
ONLY PROPERLY TRAINED PERSONNEL
FAMILIAR WITH THE TRANSFER
SWITCH EQUIPMENT AND ITS
ASSOCIATED EQUIPMENT SHOULD BE
PERMITTED TO PERFORM THE
PROBLEM SOLVING FUNCTION. IF AN
INDIVIDUAL DOES NOT FEEL QUALIFIED
TO PERFORM THE PROBLEM SOLVING
FUNCTION, THE INDIVIDUAL SHOULD
NOT ATTEMPT TO PERFORM ANY OF
THESE PROCEDURES.
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
controller. If a problem persists after having
completed the problem solving procedure,
contact a Cutler-Hammer representative for
further assistance. When calling for
assistance, the following is the minimum
information required to properly address the
need:
1. Shop Order Number (SO#) or General
Order Number (GO#) of transfer switch.
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 of the system
Effective June 2000
voltage that now appears on the load
terminals.
A. Gen-Set Does Not Start When Test
Switch is Operated and Held in "Test"
Position.
1. Check Operation. Make sure the Test
Selector Switch is held in "test" position
longer than the TDES time delay.
2. Check Engine Controls. Make sure
control is in "Automatic" position. Make
sure batteries are charged and
connected. Make sure engine start
circuit is wired.
3. Check Wiring. Make sure the start
signal wires from the engine controls
are connected to the correct terminals
on the Control Panel. See the
Schematic/Wiring Diagram.
4. Check Signal Circuit. Disconnect and
tape start signal wires. Connect the
ohmmeter between the control panel
terminals 51 and 52. The reading
should indicate an open circuit. Turn
the Test Selector Switch to "Test"
position. After TDES time delay, the
ohmmeter should indicate a closed
circuit.
B. Transfer Switch Does Not Retransfer
the Load after Normal Source Returns or
after Test Switch is returned to "Auto'
position.
1. Check Operation. Make sure time has
passed to allow for TDEN time delay.
2. Check Normal Source Voltage Levels.
On a three phase system, voltmeter
should read phase to phase voltage.
3. Check Signal Circuit. Confirm that the
Test Switch has reopened. Make sure
the controller display does not read
"Area Protection". An ohmmeter should
indicate an open circuit between
terminals P10-6 & P10-7 on the
controller.
4. Confirm "Manual Return to Normal"
is not enabled (MP1-E Only). If the
manual return to normal option is
enabled, the controller will wait for a
closed contact (a pushbutton) on inputs
P10-6 & P10-9. Check that the
pushbutton is connected properly, and
when the pushbutton is pressed, the
contacts are closing.
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