Specifications

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Doc. no.
Model
Apparatus
Scale
Page No
1SDH000460R0002
L5439
16.3. Data Logger (recorder)
The data logger function is available on the PR122/P and PR123/P units and it can be used to save the instantaneous values of
certain analog and digital measurements automatically in a large-sized memory buffer. The data can easily be downloaded from
the unit using either the SD-TestBus application via a Modbus bus, and transferred to any personal computer for processing. The
function stops the recording every time a trip occurs in order to facilitate failure analysis.
16.3.1. General characteristics
Number of analogue channels: 7
Number of digital events: 64
Maximum sampling frequency: 600 ... 4800 Hz
Sampling time 3 ... 27 s (depending on frequency of 600 Hz sampling)
16.3.2. Description of the Data Logger menu
You can access the data logger menu from the Settings menu in the PR122/P and PR123/P units:
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Data logger
Modules
Data logger
Main Frequency
Settings
16.3.2.1. Enabling the Data Logger
The data logger can be enabled by inputting a password:
1/1
Off
Toroid size
Enable
Data logger
Password
Enter password
0***
2/2
Off
On
Off
Enable
Enter 
PWD + Enter 
16.3.2.2. Setting the sampling frequency
On the menu, you can specify the frequency with which the measurements are saved, choosing from 4 fixed frequencies, i.e.
600 Hz, 1200 Hz, 2400 Hz or 4800 Hz.
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On
Sampling freq.
Stop event
Enable
Data logger
1/4
600 Hz
1200 Hz
2400 Hz
600 Hz
Sampling freq.
Enter 
The maximum data recording times (see also par. 16.3.3) depend on the selected frequency and are illustrated in the following table:
Frequency RECORDING TIME
600 Hz 27,3 s
1200 Hz 13,6 s
2400 Hz 6,8 s
4800 Hz 3,4 s
Note: Selecting sampling frequency is an important step. In fact, presence of high-order harmonic waves may cause aliasing on
processing of collected data. Use maximum frequency when a harmonic distortion is available, otherwise data processing may
give results which do not match actual system conditions.
16.3.2.3. Setting the standard stop events (triggers)
You can select one of the following stop events (triggers), see also par. 16.4.2:
1. None
2. Any alarm
3. L timing
4. Any trip
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None
Sampling freq.
Stop event
Enable
Data logger
1/5
None
Any Alarm
L Prealarm
None
Stop event
Any Trip
Custom
Enter 
If you select “None” for the stop event, the data logger can be stopped only by a stop command from the operator panel, from
the system or following a trip generated by the relay.