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Appendix A
Time Over-current Characteristic Curves
Table 37 - Characteristic Curve Cross-reference
Curve
Equivalent To
1
ABB CO-2
3
ABB CO-5
5
ABB CO-6
6
ABB CO-7
7
ABB CO-8
9
ABB CO-9
11
ABB CO-11
8
GE IAC-51
10
GE IAC-53
2
GE IAC-55
4
GE IAC-66
12
GE IAC-77
180
The CGCM-DLR unit has a maximum time dial setting of 9.9. The equivalent
time dial setting for the electromechanical maximum setting is provided in the
cross-reference table even if it exceeds 9.9. The cross-reference allows
interpolation as noted.
A linear mathematical equation determines the CGCM-DLR unit time-current
characteristics. The induction disk of an electromechanical relay has a certain
degree of non-linearity due to inertial and friction effects. For this reason, even
though every effort has been made to provide characteristic curves with
minimum deviation from the published electromechanical curves, slight
deviations can exist between them.
In applications where the time coordination between curves is close, we
recommend that you choose the optimal time dial setting by inspection of the
coordination study.
Page
Electromechanical Relay Time Dial Setting
0.5
1.0
Factory Equivalent Time Dial Setting
181
0.3
0.8
183
0.4
0.8
185
0.5
1.1
186
0.4
0.8
187
0.3
0.7
189
0.3
0.7
191
0.3
0.7
188
0.6
1.0
190
0.4
0.8
182
0.2
1.0
184
0.4
0.9
192
0.5
1.0
Voltage Restraint
In Voltage Restraint mode, when the generator voltage is between 100% and 25%
of nominal voltage, the CGCM-DLR unit automatically reduces the selected
over-current setpoint linearly according to this formula:
Adjusted over-current setpoint = original over-current setpoint * generator
voltage / voltage restraint setpoint
The range of the voltage restraint setpoint is 0...200%. A setting of zero disables
the voltage restraint.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
2.0
3.0
4.0
5.0
1.7
2.4
3.4
4.2
1.5
2.3
3.3
4.2
2.0
2.9
3.7
4.5
1.7
2.5
3.3
4.3
1.5
2.3
3.2
4.0
1.4
2.1
3.0
3.9
1.5
2.4
3.2
4.2
1.9
2.7
3.7
4.8
1.6
2.4
3.4
4.3
2.0
3.1
4.0
4.9
1.8
2.7
3.9
4.9
1.9
2.7
3.5
4.3
6.0
7.0
8.0
9.0
5.0
5.8
6.7
7.7
5.0
6.0
7.0
7.8
5.0
5.9
7.2
8.0
5.3
6.1
7.0
8.0
5.0
5.8
6.8
7.6
4.8
5.7
6.7
7.8
5.0
5.7
6.6
7.8
5.7
6.8
8.0
9.3
5.1
6.3
7.2
8.4
6.1
7.2
8.1
8.9
6.3
7.2
8.5
9.7
5.2
6.2
7.4
8.2
10.0
11.0
8.6
9.7
8.8
9.9
8.9
10.1
9.0
9.8
8.7
10.0
8.7
9.6
8.5
10.3
10.6
9.6
9.8
10.9
9.9
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