User-Defined Measuring Ranges; Continuous Monitoring Of The Measured Quantity - ABB REC 561 User Manual

1MRK 580 159-XEN
Page 7 - 18
1.1 User-defined
measuring ranges
1.2 Continuous
monitoring of the
measured quantity
Measurement of alternating
quantities
Further processing, monitoring, and supervision of different alternate
measuring quantities is possible only in the REC 561 control terminal.
You can set measuring range for different measuring channels—inde-
pendent of each other in wide setting ranges.
So users can select the most suitable measuring range for each measuring
quantity on each monitored object of a power system. In doing so, they
optimize the functionality of the power system.
Users can continuously monitor the measured quantity in each channel by
means of four built-in operating limits, see Fig. 1. The monitors operate in
two different modes of operation:
• Overfunction, when the measured current exceeds the HiWarn or
HiAlarm pre-set values
• Underfunction, when the measured current decreases under the Low-
Warn or LowAlarm pre-set values
Y
HIALARM=1
HIWARN=1
LOWWARN=1
Fig. 1 Presentation of the operating limits
Each operating level has its corresponding functional output signal (FOS).
Its logical value changes according to Fig. 1.
You can set the hysteresis, which determines the difference between the
operating and reset value at each operating point, in wide range for each
measuring channel separately. The hysteresis is common for all operating
values within one channel.
ABB Network Partner AB
HIALARM=0
HIWARN=0
LOWWARN=0
LOWALARM=0
LOWALARM=1
Version 1.0-00
HiAlarm
HiWarn
Hysteresis
t
LowWarn
LowAlarm
(x80159-1)