Manual

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 167
Time Over-current Characteristic Curves Appendix A
Time Dial Setting Cross-reference
Although the time characteristic curve shapes have been optimized for each relay,
time dial settings of the CGCM unit are not identical to the settings of
electromechanical induction disk over-current relays.
The Characteristic Curve Cross-reference
table on page 168 helps you convert
the time dial settings of induction disk relays to the equivalent setting for the
CGCM unit.
Using Table
Cross-reference table values were obtained by inspection of published
electromechanical time current characteristic curves. The time delay for a current
of five times tap was entered into the time dial calculator function for each time
dial setting. The equivalent CGCM unit time dial setting was then entered into
the cross-reference table.
If your electromechanical relay time dial setting is between the values provided in
the table, it will be necessary to interpolate (estimate the correct intermediate
value) between the electromechanical setting and the factory setting.
Table 35 - Characteristic Curve Cross-Reference
Curve Curve Name Page Similar To
1 S, Short Inverse 169 ABB CO-2
2 S2, Short Inverse 170 GE IAC-55
3 L, L1, Long Inverse 171
ABB CO-5
4 L2, Long Inverse 172 GE IAC-66
5 D, Definite Time 173 ABB CO-6
6 M, Moderately Inverse 174
ABB CO-7
7 I, I1 Inverse Time 175 ABB CO-8
8 I2 Inverse Time 176 GE IAC-51
9 V, V1 Very Inverse 177
ABB CO-9
10 V2, Very Inverse 178 GE IAC-53
11 E, E1 Extremely Inverse 179 ABB CO-11
12 E2, Extremely Inverse 180
GE IAC-77
13 A Standard Inverse 181 BS, IEC Standard Inverse
14 B, Very Inverse (It) 182
BS, IEC Very Inverse (I
2
t)
15
Extremely Inverse (I
2
t)
183
BS, IEC Extremely Inverse (I
2
t)
16 Long Time Inverse 184 BS, IEC Long Time Inverse
17 Fixed Time N/A N/A