35

36

Phase location 
A, B & C

Detection result

Positive sequence

Jack

3

Inverted sequence layout is shown in following figure. As shown in Figure 19, LCD can 

     display inverted sequence detection result when connecting 

V1

, 

V2

 and 

V3

      jacks to Phase A, B & C if three-phase voltage exceeds 50V.

Phase location 
A, B & C

Detection result

Jack

Inverted sequence

Inverted 

sequence 

Figure 19

4

LCD will display default phase detection result if certain phase of voltage is less than 50V or 

      without signal for three-phase four-wire system load. As shown in Figure 20, symbols of 
      corresponding phases will not be displayed on LCD.

Figure 20   

Default phase of the 2nd phase

Note: 

Detection voltage range of positive and inverted sequence is 30V~500V. Voltage range without 
default phase is 50V~500V.

UT241/242/243 OPERATING MANUAL 

UT241/242/243 OPERATING MANUAL