Recorder Data; Control And Indication Of Recorder Status; Triggering; Settings And Unloading - ABB REU 523 Technical Reference Manual

REU 523
4.1.7.2.
4.1.7.3.
4.1.7.4.
4.1.7.5.
30
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual

Recorder data

One recording contains the information of three analogue channels and eight digital
channels for a period of 40 cycles. The analogue channels are the momentary
voltages measured by the relay, and the digital channels are the operating signals of
the protection stages and the external binary input signal linked to the relay. The
sampling frequency is 16 times the rated frequency, resulting in 800 Hz at 50 Hz
rated frequency and in 960 Hz at 60 Hz rated frequency. At a power reset or reset of
recorded values (WV102:1) the contents of the recorder memory are lost.

Control and indication of recorder status

It is possible to control and monitor the indicated status of the disturbance recorder
by writing to and reading the parameter V246. Reading the parameter returns either
the value 0 or 1, indicating whether the recorder is not triggered, or triggered and
ready to be unloaded.
Writing the value 0 to the parameter clears the recorder memory, restarts storing of
new data in the memory and enables triggering of the recorder. Writing the value 2
to the parameter restarts the unloading process in the recorder by setting the time
stamp and first data ready to be read. Writing the value 4 to the parameter triggers
the recorder.

Triggering

Triggering the disturbance recorder for start of a new recording sequence is only
possible if the recorder is not already triggered (V246=0).
The recorder can be triggered either manually by writing the value 4 to parameter
V246 or it can be triggered by the rising or falling edge of the signals from the
internal protection stages and/or the binary input signal. Triggering on the rising
edge means that the recording sequence starts when the signal is activated.
Correspondingly, triggering on the falling edge means that the recording sequence
starts when the active signal resets.
Serial parameters V241...V244 define the triggering conditions and parameter V246
is for manual triggering. When the recorder has been triggered and a recording
stored in the memory, the value of parameter V246 changes from 0 to 1.
The default triggering condition is the operation of protection stages.

Settings and unloading

Setting parameters for the disturbance recorder are V parameters V241...V246 and
M parameters M18, M20 and M80.
Parameter Description
V241 Specifies the signal(s) to be used for triggering: signal(s) from the
internal protection stages and/or the binary input signal
V242 Defines whether the recorder is to be triggered on the falling or rising
edge of the signal(s) specified by parameter V241
V243 Defines the external binary input signal to be used for triggering
V244 Defines whether the rising or falling edge of the binary input signal is to
trigger the recorder
1MRS 750942-MUM
ABB Automation