Eaton ATC-900 Operation And Maintenance Manual - page 23
IB140064EN
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Instructional Booklet
Effective: April 2018
Page 23
Operation and Maintenance Manual, Automatic Transfer Switch, Bypass Isolation,
Contactor Type, Open/Closed Transition, ATC-900 Controller, 3000A Frame
5.6.2 Non-Automatic Operation
1. All doors must be closed and latched. The Door Open light
should not be flashing (unless the other contactor is in the iso-
lated position for testing Section 5.6.3).
2. Rotate Source Select to connected position.
3. Slowly turn the 4 position switch to the desired position for
Non-Automatic Operation. The White lamp will illuminate
once the contactors is in position. The controller will show a
banner (in yellow flashing) of "Monitor Mode" signaling that
the switch is not in automatic. The controller's MIMIC bus
and display will still show the switch information (monitored)
but no action will be performed by the controller.
4. With either or both power sources on, use the Source Select
switch to select the position of the contactor: S1-Open-S2.
5.6.3 Isolating and Testing Operation
The testing of the isolated contactor may be performed in either
the Automatic (Green Lamp) or the Non-Auto (White Lamp) mode
of operation. The user can choose whether to allow the non-iso-
lated contactor to be in the Automatic or the Non-Automatic
mode. These instructions are also shown on the operator panel of
the slider door.
1. With the the ATS or Bypass in the automatic (Green lamp)
mode, push and release the Lamp Test (Figure 31, Step1)
pushbutton and the yellow door light will remain on (Figure
30). This is the contactor that can be racked out and isolated
for testing or removal. If this is not the intended contactor
simply rotate the Auto/Non-Auto position and re-depressed
the Lamp Test pushbutton.
2. By using the Operation Select switch, if that contactor is
required to be in the automatic mode while testing the other
contactor, keep at the Green lamp. If that contactor is cho-
sen to be in the non-automatic mode while testing the other
contactor, place at the White lamp (Monitor Mode will be
present on the controller).
3. Lift the small slider shutter (Figure 30) on the chosen door
(one with the yellow light on) and slowly rack out the contac-
tor (counter clock-wise) using a 1/2" socket and extension
wrench. After a few turns the status lamp with be on (Figure
31). Continue to rack out the contactor until the status lamp
flashes once per second. At this point the contactor is iso-
lated from the stabs but still connected to the secondary con-
nector (for control). The contactor can now be exercised if
desired.
Figure 30. Door with Yellow Light and Racking Shutter Door.
4. Electrical test can be performed on the isolated contactor by
using the Source Select switch. Enable the Test switch (Fig-
ure 31, Step 3) and now the Source Select exercises the iso-
lated contactor.
If the enable switch was disabled, the user has control of the
racked in contactor if the Operation Select switch was in Non-
Auto. By slowly switching to S1 or S2 the contactor will close
to the source chosen. If "OFF" the contactor will be in the
open position. Only one power source is required to switch to
S1 or S2. The isolated contactor door can be opened (recom-
mended to be closed) to run tests but the other door must
remain closed. The green and red flags (Figures 27 & 28)
show the position of the contactor.
Figure 31. Status Lamps and Controls for Isolation/Test and
Removal.
5. If the Contactor is racked out further, the Status lamp will
now flash at once every 5 seconds. At this point the second-
ary connector is not connected and a non-electrical manual
test may be performed by using the paddles as shown in Sec-
tion 5.3. For closing on S1 simply push the top of the paddle.
To open the contactor push the green button which will open
both sides. To go to S2 push the bottom of the paddle. If the
contactor is racked out, pull the rails carefully as the unit is
heavy. Once the rails are out, the contactor can be lifted off
the rails with a lifting device. Figure 32 shows a contactor
(ATS or Bypass) ready to be lifted from the transfer switch.
The contactor weighs about 300-lbs. The stabs in the back of
the cell are powered but are isolated from the cell by shutters
that automatically close when either switch is racked out.
CAUTION
THE NON-AUTO OPERATION OF THE CONTACTOR WILL RESULT IN
THE CONTROLLER BEING INACTIVE IN CONTROLLING THE CONTAC-
TOR.
CAUTION
IN THE NON-AUTOMATIC OPERATION, THE USER CAN REMOVE
POWER TO THE LOAD BY TURNING TO THE OFF POSITION OR BY
SWITCHING TO A SOURCE WITH NO POWER. SIMPLY TURN THE
SWITCH TO THE POWER SOURCE AVAILABLE FOR LOAD POWER.
Slider
Door