Rockwell Automation 284 ArmorStart User Manual - Manual (Page 18)

1-6 Product Overview
The Bulletin 283 overload trip class allows for class 10 protection.
Ambient insensitivity is inherent in the electronic design of the
overload.
Figure 1.2 Overload Trip Curve
The Bulletin 284 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.
Programming the Motor OL Current parameter provides class 10
overload protection for the Bulletin 284 Distributed Motor Controller.
Ambient insensitivity is inherent in the electronic design of the
overload.
Figure 1.3 Overload Trip Curves
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 10
% of P132 (Motor NP Hertz) % of P132 (Motor NP Hertz) % of P132 (Motor NP Hertz) % of P133 (Motor OL Current) % of P133 (Motor OL Current) % of P133 (Motor OL Current)