1MRS 750942-MUM
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
REU 523
45
Input and output signals
The measured voltages and the status of the binary input signal can be read (R) with
parameters I1...I4. When the value of parameter I4 is 1, the binary input will be
energized. The value of the calculated positive-phase-sequence voltage can be read
with parameter I5.
Each protection stage has its internal output signal. These signals can be read (R)
with parameters O1...O8. The state of he output contacts can be read (R) or changed
(W) with parameters O9...O12. When the value of any of parameters O1...O12 is
changed from 0 to 1, it will be recorded in the corresponding parameter O21...O32.
Re-reading of an event register B R Time, channel number and
event code
Type designation of the relay F R REU 523
Reading of relay state data C R 0 = normal state
1 = the relay has been subject
to an automatic reset
2 = overflow of an event register
3 = both events 1 and 2
Resetting of relay state data C W 0 = resetting all events
1 = reset only E50
2 = reset only E51
4 = reset all events including
E51 except for E50
Time reading and setting T R, W 00.000...59.999 s
Date and time reading and setting D R, W YY-MM-DD HH.MM;SS.sss
Table 4.1.10.4-8 Inputs
Description Parameters (R) Value
Voltage U
12
I1 0...2 x U
n
Voltage U
23
I2 0...2 x U
n
Voltage U
31
I3 0...2 x U
n
Binary input signal I4 0 or 1
Positive-phase-sequence voltage I5 0...2 x U
n
Table 4.1.10.4-9 Output signals
Status of the protection stages
State of stage
(R)
Recorded
functions (R)
Value
Start of stage U> O1 O21 0 or 1
Trip of stage U> O2 O22 0 or 1
Start of stage U>> O3 O23 0 or 1
Trip of stage U>> O4 O24 0 or 1
Start of stage U< O5 O25 0 or 1
Trip of stage U< O6 O26 0 or 1
Start of stage U<< O7 O27 0 or 1
Trip of stage U<< O8 O28 0 or 1
Table 4.1.10.4-7 Control parameters
Description Parameter R, W Value
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