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Tru O N E® AT S , I N S TA LL ATI O N A N D O PER ATI N G I N S TR U C TI O N
1
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6.1 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
Phase rotation of sources 1 and 2 are
different
Connect the phases of both sources in
the same order
S1 undervoltage
Voltage of source 1 is under the
threshold level set in parameter “Drop-
out voltage, lower threshold“
Check the correlation between power
source and device configuration
S1 overvoltage
Voltage of source 1 is over the
threshold level set in parameter “Drop-
out voltage, upper threshold“
Check the correlation between power
source and device configuration
S1 phase missing
One or two phases of source 1 are
missing
Check the power source and
connections
S1 unbalance
Phases of source 1 are not symmetric
Check the power source
S1 phase rotation
Phase rotation of source 1 is different
from the value of parameter “Phase
sequence“
Connect the phases according to the
configuration
S1 invalid frequency
Frequency of source 1 is out of range
set in parameters “Drop-out frequency,
upper threshold“ and “Drop-out
frequency, lower threshold“
Check the correlation between power
source and device configuration
S2 undervoltage
Voltage of source 2 is under the
threshold level set in parameter “Drop-
out voltage, lower threshold“
Check the correlation between power
source and device configuration
S2 overvoltage
Voltage of source 2 is over the
threshold level set in parameter “Drop-
out voltage, upper threshold“
Check the correlation between power
source and device configuration
S2 phase missing
One or two phases of source 2 are
missing
Check the power source and
connections
S2 unbalance
Phases of source 2 are not symmetric
Check the power source
S2 phase rotation
Phase rotation of source 2 is different
from the value of parameter “Phase
sequence“
Connect the phases according to the
configuration
Frequency Difference
Frequency difference of voltage
sources is greater than 3 Hz while in-
phase monitor is on
Alarm is active and transfer operations
disabled as long as the frequency
difference is above the accepted level
Table 6.1 Alarms-list in level 3 and 4, LCD and touch control interfaces
LCD
Touch
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6. Troubleshooting
L
CD
, T
O
U
CH
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