ABB Zenith ZBTS T Series, Installation And Operating Instruction, Page: 35 / 112

35 3 4ZBT S _ 3 0 -1 2 0 0A rev. A / 1 S CC 3 0 3 0 4 3 M 0 2 01
1
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3.4 Description of Basic Functionality
tion allows also the use of the HMIs on
both switches. There is no need to change
this setting at any stage of use.
3.4.1 How to draw out the switch to Test
and Isolated locations – Bypassing the
ATS switch
This paragraph includes the functional
step-by-step description of bypassing the
ATS switch. Normally, the ATS switch is
set in operation mode: Auto, connected to
Source 1 (or Source 2) and supplying the
system load. The Bypass switch is manual
operated in the operation mode: MAN
permanent, the contacts are open but
ready for use.
3.4.1.1 Step 1: Operate Bypass switch to
same Power Source as ATS
Operate Bypass switch to same power
source as ATS via HMI of Bypass (cross
-control prevented). See both HMIs on the
front cover. The power supply used by the
ATS can be checked on the ATS HMI.
Lamp
test
l
ON
Off
load
test
ll
ON
Auto
Alarm reset
On
load
test
Bypass
time
delay
O
OFF
Manual
retransfer
Auto
config
Priority In-phase
monitor
AUTO
!
S1 S2
LOAD
ll
O
l
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Fig. 3.17 HMI of ATS –> HMI of Bypass switch, the
new Bypass switch position will be the same as ATS
The power supply is Source 1, if the green
LED light is on at S1 as shown in the Fig.
3.17. You can operate the Bypass switch to
the same power supply S1 by pressing the
green "I ON" button on the HMI of the By-
pass switch, see the Fig. 3.18.
The system provides the ability to with-
draw the ATS for test and / or mainte-
nance purposes without interrupting the
load. During operation, the contacts of
Bypass switch are closed paralleling the
ATS contacts, which then allows with-
drawal of the ATS to the “TEST” or “ISO-
LATE” locations. The systems include me-
chanical and electrical interlocks that
prevent cross-service.
By default ATS is in Operation mode: MAN
momentary,
it is highly recommended to
set the ATS to Operation mode: Auto. ATS
is connected to the Source 1 (or Source 2)
and it is supplying the load. The contacts
of the manually controlled Bypass switch
are open. The Bypass switch is in the op-
eration mode: MAN permanent, which
means Connected location; ready for use.
Both switches have their own HMI that
shows the location and position of the
switch.
Locking mode
Manual mode Automatic mode
Ø 5...6 mm
0.20...0.24 in
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Fig. 3.16 The Slide Switches in both the ATS and Bypass
switch bodies are set to AUTO-position at the factory
Both ATS and Bypass switches have a
Slide Switch (see Fig. 3.16) in the switch
body. Both Slide Switches are set to
AUTO-position at the factory. This posi-