Product Overview 1-3
Description of Features Overload Protection
The ArmorStart Distributed Motor Controller incorporates, as
standard, electronic motor overload protection. This overload
protection is accomplished electronically with an I
2
t algorithm. The
ArmorStart’s overload protection is programmable via the
communication network, providing the user with flexibility.
The Bulletin 280/281 overload trip class can be selected for class 10,
15, 20 protection. Ambient insensitivity is inherent in the electronic
design of the overload.
Figure 1.1 Overload Trip Curves
Class 15 Overload Curves
1
100
10000
0 100 200 300 400 500 600 700
Multiples for Full Load Current
Approximate Trip Time (sec)
Cold
Hot
Class 10 Overload Curves
1
10
100
1000
10000
0 100 200 300 400 500 600 700
Multiples of Full Load Current
Approximate Trip Time (sec)
Cold
Hot
Class 20 Overload Curves
1
100
10000
0 100 200 300 400 500 600 700
Multiples of Full Load Current
Approximate Trip Time (sec)
Cold
Hot
Class 10
Class 15
Class 20
%
%
of
%
