ABB REL650 series Technical Manual page 680

Section 14
Monitoring
674
Comparator
V<BattVoltLowLim
V_BATT
Comparator
U<BattVoltHiLim
ANSI11000292 V1 EN
Figure 309: Functional module diagram
The battery rated voltage is set with the RtdBattVolt setting. The value of the
BattVoltLowLim and BattVoltHiLim settings are given in relative per unit to the
RtdBattVolt setting.
It is possible to block the function outputs by the BLOCK input.
Low level detector
The level detector compares the battery voltage V_BATT with the set value of the
BattVoltLowLim setting. If the value of the V_BATT input drops below the set value of the
BattVoltLowLim setting, the pickup signal PU_VLOW is activated.
The measured voltage between the battery terminals V_BATT is available through the
Monitored data view.
High level detector
The level detector compares the battery voltage V_BATT with the set value of the
BattVoltHiLim setting. If the value of the V_BATT input exceeds the set value of the
BattVoltHiLim setting, the pickup signal PU_VHI is activated.
Time delay
When the operate timer has reached the value set by the tDelay setting, the AL_VLOW and
AL_VHI outputs are activated. If the voltage returns to the normal value before the
module operates, the reset timer is activated. If the reset timer reaches the value set by
tReset, the operate timer resets and the PU_VLOW and AL_VHI outputs are deactivated.
0 0-tDelay
0-tReset 0
0 0-tDelay
0-tReset 0
1MRK 506 335-UUS A
PU_VLOW
AL_VLOW
PU_VHI
AL_VHI
ANSI11000292-1-en.vsd
Technical manual