Table of Contents
Advertisement
Sequence of Operations -
Manual Mode - Bypass ATS (Cont.)
After the isolation operation, if the Bypass ATS is closed on
Source 1 and if this source fails, an auxiliary contact on the
bypass control will automatically start the engine-generator set.
When the second source is available, the Bypass ATS may
be operated to transfer the load to the available source.
Interlocks prevent this transfer, if the Isolation ATS is in
the AUTO position and still connected to Source 1.
In the event the Bypass ATS has to be operated
manually with the Isolation ATS in the ISOLATE or
TEST position, please follow these steps:
1. Verify that the Isolation ATS is in either the Isolate or Test
position. This can be performed by observing the Status
Annunciation Lights (refer to gure S5-1 for location).
2. When ready to operate the Bypass ATS, open
the Bypass Access Panel (refer to gure S5-1
for location of the Bypass Access Panel).
3. An illuminated Status LED (green) will indicate that the
mechanism spring is charged and that the mechanism could
perform transfer to a particular power source. Refer to table
T4-2 for all possible combination of status indication.
4. A Status LED (green) that is not illuminated will
indicate that the Bypass ATS is not ready to
perform transfer to a particular power source,
due to mechanism spring not charged.
5. To open a closed contact, depressed the Open
Button at the middle of the Bypass ATS.
6. To manually charge the closing spring, the
Charging Handle needs to be inserted into the
manual charge access point of the power source
to which the Bypass ATS needs to close onto.
7. With the handle inserted into the appropriate access point,
perform a clockwise rotation to initiate charging sequence.
8. Keep rotating the Charging Handle until the closing spring
is fully charged. At this point, the handle will not be able
to be rotated further. Refer to table T4-3 for approximate
number of rotations needed to completely charge the spring.
9. Once the Bypass ATS Status LED (green) is
illuminated, depress the Close Button to transfer
the Bypass ATS to the intended power source.
Zenith Automatic Transfer Switch
|
new.abb.com/low-voltage
Sequence of Operations -
Racking Operation
1. Verify that the Bypass ATS contacts are open and the
Isolation ATS is supplying load.
2. Turn Control Switch to the Inhibit position.
3. Open Bypass Access Control Panel.
4. Position status for both S1 and S2 Bypass ATS contacts
should read Open.
5. Determine which contact set of the Bypass ATS needs to be
closed. The Bypass ATS needs to close into the same source
as that of the Isolation ATS's.
6. An illuminated Status LED (green) will indicate that the
mechanism spring is charged and that the mechanism
could perform transfer to a particular power source.
Refer to table T4-2 for all possible combination of
status indication.
7. A Status LED (green) that is not illuminated will indicate
that the Bypass ATS is not ready to perform transfer to a
particular power source, due to mechanism spring
not charged.
8. To manually charge the closing spring, the Charging Handle
needs to be inserted into the manual charge access point
of the power source to which the Bypass ATS needs to
close onto.
9. With the handle inserted into the appropriate access point,
perform a clockwise rotation to initiate charging sequence.
10. Keep rotating the Charging Handle until the closing spring
is fully charged. At this point, the handle will not be able
to be rotated further. Refer to table T4-3 for approximate
number of rotations needed to completely charge
the spring.
11. Once the Bypass ATS Status LED (green) is illuminated,
depress the Close Button to transfer the Bypass ATS to the
intended power source.
12. Closure of contacts into the intended power source is
indicated by the Position Indicator which will read "ON".
13. To rack out Isolation ATS to the TEST position, insert the
Charging Handle into the Rack Insertion Hole (refer to
gure S5-2 for location).
14. Rotate the Charging Handle counter-clockwise until the
"TEST" Status Annunciation Light is illuminated.
15. To rack out to the ISOLATE position, continue to rotate the
Charging Handle counter-clockwise until the "ISOLATE"
Status Annunciation Light is illuminated.
16. To Remove ATS: Refer to the "Removal of the Isolation
ATS" section.
22
Advertisement
Table of Contents
