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KraftPowercon Sweden AB, Hjalmar Petris väg 49, S-352 46 Växjö, Sweden, Tel: +46 470-705200, Fax: +46 470-705201,
www.kraftpowercon.com
5.16.6 Alarm descriptions
OVERVOLTAGE, U>
Function: Monitors the float charging voltage's upper limit.
Alarm condition: The system voltage exceeds the set limit value.
Interlocking: The alarm is blocked in the event of equalizing charging.
Other: The limit value is specified as volt deviation (dV) from the set float charging
level. If the float charging voltage is temperature controlled, the absolute level
of the limit value will thereby vary with the temperature.
OVERVOLTAGE, U>>
Function: Monitors the system voltage's upper limit.
Alarm condition: The system voltage exceeds the set limit value.
Interlocking: -
UNDERVOLTAGE, U<
Function: Monitors the float charging voltage's lower limit.
Alarm condition: The system voltage falls below the set limit value.
Interlocking: 1) When testing with lowered voltage, e.g. battery circuit test).
2) If the rectifier works with an output current greater than 90 % of the set
current limit. Interlocking can be prevented by using the special function
XM1.
Other: The limit value is specified as volts deviation (dV) from the set float charging
level. If the float charging voltage is temperature controlled, the absolute level
of the limit value will thereby vary with the temperature.
UNDERVOLTAGE, U<<
Function: Monitors the system voltage's lower limit.
Alarm condition: The system voltage falls below the set limit value.
Interlocking: When testing with lowered voltage, e.g. battery circuit test). Should the test
continue for unreasonably long time (ca 10 min), the interlocking will cease.
SYMMETRY FAULT 1
Function: Compares the battery's upper and lower half by measuring the mid voltage.
Handles deviations that last for a longer period.
Alarm condition: The difference between the battery's mid voltage and half of the system voltage
exceeds the set limit value (specified in % of system voltage).
Interlocking: Mid voltage measurement, and thereby the alarm function, can be deselected
in the “Functions” menu.
Fault causes: 1) Disabled battery cell.
2) Uneven charging condition. Equalizing charging may help.
3) New VR batteries can display fairly large cell voltage variation in both
fully-charged and uncharged condition despite being totally fault-free. This
phenomenon can in certain cases remain for as much as a whole year.
Other: Due to an uneven amount of cells or that the battery block does not have a
voltmeter terminal for each cell, the measurement point will deviate from the
actual midpoint. See section 5.13.3 for how you set the percentage of total
system voltage that the measured mid voltage corresponds to.
SYMMETRY FAULT 2
Function: Compares the battery's upper and lower half by measuring the mid voltage
during an advanced battery circuit test. Handles deviations that occur during
test.
Alarm condition: The difference between the battery's mid voltage and half of the system voltage
exceeds the set limit value (specified in % of system voltage).
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