Eaton ATC-900 Operation And Maintenance Manual - page 25
IB140064EN
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Instructional Booklet
Effective: April 2018
Page 25
Operation and Maintenance Manual, Automatic Transfer Switch, Bypass Isolation,
Contactor Type, Open/Closed Transition, ATC-900 Controller, 3000A Frame
i
Figure 34. Racked in Contactor Using a Clockwise Ratcheting
Motion.
With power is off, there will be no status lamps, of course. Sec-
tion 5.6.3 shows the operation of the status lamps when power is
present.
Figure 35 shows a position label on the side wall of the contactor
cell. This is not used when the power is present as the door
should be closed at least until the the status lamp is flashing once
per second. If no power is present, this is a manual reference
when racking the contactor in or out with power off. The label is a
reference but not an exact reference.
The “Connect” area of the sticker is where the contactor is
Racked In. If power is on, the status lamp will go off when the
contactor is on the stabs. Once the status lamp goes to Off, turn
the ratchet until a hard stop occurs but do not over stress. This is
usually about one-two turns after the lamp goes to Off. If the
switch power is off, look at the label and when the unit is in near
the "connected" position, rack in slowly to the stop but do not
over stress.
Figure 35. Position label.
Section 7: Testing and Problem Solving
7.1 Operation
The most popular reasons for the contactor to not function prop-
erly are:1) A contactor(s) is not racked in fully, 2) the doors must
be closed and latched for automatic or Non-Automatic usage, 3)
the setpoints on the controller are not set correctly and 4) the
switch is in Non-Automatic with the controller's yellow banner
showing "Monitor Mode".
One can easily test to see if the contactors are racked in fully
(Locked In) as the Status lamp(s) should be off. If a contactor is
removed or in the isolated position, the other contactor will still be
able to perform automatic, see Section 5. Many times the door is
not closed and latched. The door light will be flashing. The door
must be closed and latched to operate in the following modes:
1. Automatic mode using either Contactor.
2. To go between contactors (Auto/Bypass).
3. To perform the Automatic operation when one contactor is in
the isolated Test position. (Door on locked in contactor must
only be closed).
4. To use either of the contactors in non-auto mode.
Notice the controller's top yellow banner. If the banner says
"Monitor Mode" than the switch is not in automatic.
7.2 Lights and Logic Panel
A simple lamp test can be performed using the lamp test push but-
ton switch on the option panel. All lamps (not the ATC-900
lamps) should light when being tested. Pushing the lamp test on
the switch and having the lamps all light is a very good sign that
the logic controller (LC) is operating correctly.
7.3 Testing
After the ATS equipment is initially installed or during planned out-
ages, the installation should be tested to ensure that all equipment
operates properly. This attention to detail will help avoid unex-
pected malfunctions. Mechanical and/or electrical tests should be
performed as described in this section.
The frequency of subsequent testing should be based on recom-
mendations of the Genset manufacturer. Make sure the generator
is supplying the correct voltage and frequency to the switch
(Source Available on Controller).
CAUTION
IT IS IMPORTANT TO TAKE GREAT CARE WHEN REMOVING OR
INSTALLING A CONTACTOR DEVICE. IF THE DEVICE IS NOT PROP-
ERLY SEATED ON THE APPROPRIATE SLIDE, IT COULD FALL CAUS-
ING EQUIPMENT DAMAGE AND/OR BODILY INJURY.
WARNING
HIGH VOLTAGE ASSOCIATED WITH OPERATIONAL TRANSFER
SWITCH EQUIPMENT PRESENT A SHOCK HAZARD THAT CAN
CAUSE SEVERE PERSONAL INJURY OR DEATH. WHILE ENERGIZED,
AN ARC FLASH AND SHOCK HAZARD EXISTS. CONSULT NFPA
70E AND OSHA GUIDELINES FOR OPERATOR SAFETY PRIOR TO
SERVICING, INSPECTING OR OPERATING EQUIPMENT.
IN ADDITION, IMPROPER OPERATION OF THE GENERATOR SET
PRESENTS A HAZARD THAT CAN CAUSE SEVERE PERSONAL
INJURY OR DEATH. OBSERVE ALL SAFETY PRECAUTIONS IN YOUR
GENERATOR SET OPERATIONS AND INSTALLATION MANUALS.