How To Draw-Out The Switch To Test And Isolated Locations - Bypassing The Ats Switch - ABB Zenith ZBTS T Series Installation And Operating Instruction

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Zenith ZBTS T-series 100 – 600 A, I N S TA L L AT I O N A N D O P E R AT I N G I N S T R U C T I O N
3.4.2 How to draw-out the switch to
TEST and ISOLATED locations –
Bypassing the ATS switch
This paragraph includes the functional
more detailed step-by-step description of
bypassing the ATS switch.
3.4.2.1 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.
S1 O
l
LOAD
—
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.
l O
ON OFF
—
Fig. 3.18 HMI of Bypass switch. If the power supply
of ATS is Source 1, the new Bypass switch position
will be the same as ATS by pressing "I ON" button
S2
ll
ll
ON
If the power supply of ATS is Source 2 (the
green LED lights up at S2 in HMI of ATS)
you can operate the Bypass switch to the
same power supply S2 by pressing the
green "II ON" button (right side) on the
HMI of the Bypass switch.
Both switches are connected to the same
power source for a while. The ATS switch
automatically exits the operation mode:
AUTO, when the Bypass switch is con-
trolled to operate the load from Source 1
(or Source 2). Only one switch can be in
operation mode: AUTO at the same time.
3.4.2.2 Step 2: Operate ATS to OFF
position
Push the red button "O OFF" on the HMI of
ATS. The contacts of ATS are now open,
but the plug connectors on racking out
system are still connected to the busbar.
It is now possible to set the Bypass switch
to Operation mode: AUTO ( –> Main Menu
–> Operation –> Operation mode –>
AUTO), see paragraph 3.3.1.3 Main Menu.
Bypass switch works like a normal Auto-
matic Transfer Switch and now supplies
the system load.
l O
ON OFF
—
Fig. 3.19 HMI of ATS. To open the main contacts of ATS,
push the red "O OFF" button
ll
ON