Static Transfer Switch
STS207
User Manual
Page 22 (28)
ELTEK VALERE DEUTSCHLAND ©2009 UM_STS207_WEB_E_R1.4
List of the possible alarm messages:
Alarm messages Meaning/possible reason Corrective action
Source Mains f. Mains voltage or frequency not Ok Check mains voltage
Source INV fail INV voltage or frequency not Ok Check INV voltage
Synchr. error Mains and INV voltage are not
synchronous
No mains voltage or
frequency of mains voltage is not stable.
Inverter fail. INV failure CAN communication with one ore more INVs
failed or INV failure detected via CAN
INV redundancy INV failure The last redundant INV is not Ok!
e.g. INV count=3, INV red. count=2 error
active when two inverters are not OK!
INV count crit. INV failure The first not redundant INV is not Ok!
e.g. INV count=3, INV red. count=2 error
active when three inverters are not OK!
STS overtemp STS over temperature Check the air flow
Check admissible ambient temperature
STS overload STS output current to high Reduce load current
INV overload Actual output current exceeds the
combined INV power#
Reduce load current or
increase INV power by additional inverter
INV red. overl. Actual output current exceeds the com-
bined and not redundant INV power##
Reduce load current or
increase INV power by additional inverter
DC-voltage low Battery voltage low Check DC voltage system (CAN-Off command is
send to the inverters)
DC-voltage high Battery voltage high Check DC voltage system (CAN-Off command is
send to the inverters)
fan error Internal fan error Check air flow, change fan
Uout error Output voltage < 95% Vin (Mains/INV) Check output voltage
Ubatt< warning Battery voltage < warning level Check DC voltage system
Ubatt> warning Battery voltage > warning level Check DC voltage system
#Example: Case 1): The STS is running on Mains with an actual load of 3.0kVA. There are two INVs in-
stalled in the system, each one with a nominal output power of 2.25kVA but one of the INVs has
switched off by over temperature.
>> Even though the STS is measuring the INV voltage and declares "Source INV" as OK, it will not switch
back to INV because the actual output current exceeds the power of one INV!
Case 2): The STS is running on "Source INV" while one INV turns off, the STS will activate the "INV over-
load" error but will switch to "Source mains" not till then "Source INV" is also broken-down!
##Example: The INV rack is running with three INVs (each 2.25kVA) from which one is configured as
redundant. If the STS output power exceeds 4.5kVA the error “INV red. overl.” will occur. The system
output power is too high for the two not redundant INVs!
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