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164, 1856
A
165, 1857
UC1
B
166, 1858
C
168, 1860
A
169, 1861
UC2
B
170, 1862
C
A
I ≥
B
0.04In
C
1
UC1 BLOCK
1568
1
1569
UC2 BLOCK
Setting
The table below shows the setting elements necessary for the undercurrent protection and their
setting ranges.
Element
UC1
TUC1
UC2
TUC2
[UC1EN]
[UC2EN]
(*) Current values shown in parenthesis are in the case of a 1 A rating. Other current values are in
the case of a 5 A rating.
687
655
&
&
688
656
&
&
689
657
&
&
[UC1EN]
+
"ON"
690
658
&
&
691
659
&
&
692
660
&
&
[UC2EN]
+
"ON"
Figure 2.1.51
Undercurrent Protection Scheme Logic
Range
Step
0.5 – 10.0 A
0.1 A
(0.10 – 2.00 A)(*)
(0.01 A)
0.00 – 300.00 s
0.01 s
0.5 – 10.0 A
0.1 A
(0.10 – 2.00 A)
(0.01 A)
0.00 – 300.00 s
0.01 s
Off / On
Off / On
⎯
58
TUC1
t
0
&
0
t
&
0
t
&
0.00 - 300.00s
TUC2
t
0
&
0
t
&
t
0
&
0.00 - 300.00s
Default
Remarks
1.0 A
UC1 threshold setting
(0.20 A)
1.00 s
UC1 definite time setting
2.0 A
UC2 threshold setting
(0.40 A)
1.00 s
UC2 definite time setting
Off
UC1 Enable
Off
UC2 Enable
⎯
6 F 2 S 0 8 4 2
440
UC1-A TRIP
441
UC1-B TRIP
442
UC1-C TRIP
439
≥ 1
UC1 TRIP
444
UC2-A ALARM
445
UC2-B ALARM
446
UC2-C ALARM
443
≥ 1
UC2 ALARM
In : Rated current
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