In article no.3 „Analyser Chauvin Arnoux CA8335: 3. Inrush mode“ I‘ve described how to measure starting current of motor. However by using “inrush current” mode you can’t measure the whole time of starting motor. For this purpose more convenient is to use “trend mode”. By using “trend mode” you can also monitor parameters of electrical network for longer time, for example you can measure voltages twenty four hours. You can also select measuring’s accuracy: from 1 sec to 10 minutes. For example, if your measuring’s accuracy is 10 minutes then analyser will measure 1 voltage sample per 10 minutes. Or if your measuring’s accuracy is set to 1 sec then analyser will measure 1 voltage sample per 1 sec.

In this article we’re going to measure the whole time of starting motor by using “trend mode”. Often it is not known how long is starting time of the motor, for this purpose “trend mode” is used.

 

Measuring sequence:

  1. Measuring scheme and connecting analyser’s currents leads.
  2. Setting parameters of “trend mode”.
  3. Starting “trend mode”.
  4. Stopping “trend mode”.
  5. Opening of the record.

 

 

  1. How to select measuring scheme and how to connect analyser’s currents leads read in article no.1 Analyser Chauvin Arnoux CA8335: 1. Transient mode“ particles no.2-4, 7.

Fig. 1 Chauvin Arnoux CA8335

 

Measuring scheme:

Fig. 2

 

 

  1. Setting parameters of “trend mode”. Press “Setting” button, then select “Trend mode” by using buttons “up” / ”down”:

Fig. 3

 

Press button “Enter”.

We are going to measure only currents, so we should select only parameter “Arms”:

Fig. 4 Chauvin Arnoux CA8335

 

In window “Trend mode” beneath you can see four modes. For each mode you can select various parameters which later can be measured. We are going to use only first mode.

 

 

3. Starting “trend mode”. Press button „Trend mode“ as shown in the figure:

Fig. 5 Chauvin Arnoux CA8335

 

In window „Recording schedule“ set parameters as shown in the picture:

Fig. 6

Here,

“Set-up” – number of measuring mode. In the figure 4 are shown modes’ settings. We’re going to measure only currents Arms.

“Start” – starting time of the recording

“Stop” – stop time of the recording

“Period” – accuracy of measuring. You can select accuracy from 1 sec to 10 min. For example, if your measuring’s accuracy is set to 10 minutes then analyser will measure 1 voltage sample per 10 minutes. If your measuring’s accuracy is 1 sec then analyser will measure 1 voltage sample per 1 sec.

“Name” – name of the recording

 

 

Press yellow button below icon “OK” (see figure 4). “Trend mode” is defined.

Title “Recording on stand by” will appear:

Fig. 7 Chauvin Arnoux CA8335

 

After starting of the recording, title “”Recording in progress” will appear:

Fig. 8

During starting process of the motor between 11:41 and 11:48 hours, analyser starts recording inrush current of the motors.

 

4. To stop recording process press yellow button below icon “hand”:

Fig. 9

 

5. Opening of the record. Press yellow button below icon “catalogue”:

Fig. 10 Chauvin Arnoux CA8335

 

Window “Recording list” appears:

Fig. 11 Chauvin Arnoux CA8335

Press button “Enter”.

 

In window “Recording parameters” press yellow button below icon “Arms”:

Fig. 12

From window “Recording parameters” you can see that record length is about 1 minute, measuring accuracy is 1 sec.

 

Phase’s L1 inrush current will appear:

Fig. 13 Chauvin Arnoux CA8335

 

Motor phase’s L2 inrush current:

Fig. 14 Chauvin Arnoux CA8335

 

Motor phase’s L3 inrush current:

Fig. 15 Chauvin Arnoux CA8335

 

L1, L2, L3 inrush currents of the motor readed from analyser with software “PTA”:

Fig. 16

 

Fig. 17

Fig. 18 Chauvin Arnoux CA8335

 

How to read recorded curves from analyser to PC by using software “PTA”, read article no. 1 “Analyser Chauvin Arnoux CA8335: Transient mode” particle no.9

 

So by using “trend mode” we can record the whole starting process of the motor. It’s easy to use.