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34ZBTS_30-1200A rev.A / 1SCC303043M0201
1
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5. Troubleshooting
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5.1 Alarms
Message Fault Action
Locked, Alarm LED on Lock input activated Unlock
Switch not in AUTO
mode, Alarm LED on
Slide switch is in handle or lock
position
Turn slide switch into the AUTO position
Phases crossed
different
Connect the phases of both sources in
the same order
threshold level set in parameter “Drop-
out voltage, lower threshold“
Check the correlation between power
source and device configuration
threshold level set in parameter “Drop-
out voltage, upper threshold“
Check the correlation between power
source and device configuration
missing
Check the power source and
connections
Check the power source
from the value of parameter “Phase
sequence“
Connect the phases according to the
configuration
set in parameters “Drop-out frequency,
upper threshold“ and “Drop-out
frequency, lower threshold“
Check the correlation between power
source and device configuration
disconnected
Note: The loss of neutral will be
systems with unbalanced loads
and that the corresponding power
distribution system parameter is set
correctly
Continued on the next page
Warning
Any troubleshooting should be conducted by
trained and authorized personnel only. Appro-
priate personal protective equipment (PPE)
shall be used when troubleshooting the ATS /
Bypass switch panel.
Danger
Hazardous voltage may be present. Disconnect
all power sources before performing work in-
side the ATS / Bypass switch panel. Failure to
do so may result in serious injury or death.
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