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3.2.5 Load monitoring (undercurrent monitoring)
Thyro-A is suited for monitoring loads which consist of one or several resistors in pa-
rallel or in series parallel connection.
Thyro-A recognises an increase in load resistance. The load monitor works as an
undercurrent monitor and is suitable for application in all operating and control
modes. Load monitoring is delivered with the default setting OFF = left stop R205.
For all other settings the following applies:
If the load current undercuts the set level, the fault relay is released. The incident is
indicated through a bus system which can optionally be installed.
For Thyro-A 1A and Thyro-A 2A (load with separate neutral point without N)
a setting for load monitoring can be made according to the table below:
e.g.
I
load nom.
parallel
/
load
I
type contr.
resistances
Number
1
100%
1
80%
1
60%
1
40%
1
20%
2
100%
2
80%
2
60%
2
40%
2
20%
3
100%
3
80%
3
60%
3
40%
4
100%
4
80%
4
60%
4
40%
5
100%
5
80%
5
60%
5
40%
Tab. 2a Load monitoring
Thyro-A 1A
Thyro-A 2A
load with separate neutral point without N
Resistance
Recommended
increase
setting
in case
for poti
of fault
R205
50.0%
40.0%
Infinite
30.0%
20.0%
10.0%
75.0%
60.0%
100%
45.0%
30.0%
15.0%
83.3%
66.7%
50%
50.0%
33.3%
87.5%
70.0%
33%
52.5%
35.0%
90.0%
72.0%
25%
54.0%
36.0%
X2.9
X2.9 [V]
[0-20mA]
5.0
10.0
4.0
8.0
3.0
6.0
2.0
4.0
1.0
2.0
7.5
15.0
6.0
12.0
4.5
9.0
3.0
6.0
1.5
3.0
8.3
16.7
6.7
13.3
5.0
10.0
3.3
6.7
8.8
17.5
7.0
14.0
5.3
10.5
3.5
7.0
9.0
18.0
7.2
14.4
5.4
10.8
3.6
7.2
ca.
Revo-
lutions
8.5
7.0
6.0
4.5
2.5
12.0
9.5
7.5
6.0
3.5
13.0
10.5
8.5
6.0
13.5
11.5
9.0
6.0
14.0
11.5
9.0
6.5
79
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