INFO
The derate function is typically used when cooling problems are expected.
6.7.1 Input selection
Each derate function can be assigned to one of the following inputs (using parameter 6241, 6251 or 6261):
Input Comment
Multi-input 102 (slot #7) 0-40V DC
4-20 mA
Pt100/1000
RMI
Digital
Multi-input 105 (slot #7)
Multi-input 108 (slot #7)
Analogue input (M15.X) 4-20 mA
Multi-input (M16.X)
0-5V DC
4-20 mA
Pt100
External analogue input (H12.X)
EIC (only with option H12)
EIC cooling water temp. (SPN 110)
EIC Oil temp. (SPN 175)
EIC Ambient temp. (SPN 171)
EIC Intercool temp. (SPN 52)
EIC Fuel temp. (SPN 174)
EIC Derate request (SPN 3644)*
M-Logic
If M-Logic, Output, Command, Derate Pnom 1/2/3 is activated, the AGC uses the value in
parameter 6246 for derating.
*Note: See EIC derate. Alternatively, you can enable parameter 7551 to activate derate requests directly from the EIC.
INFO
If more than one derate function and/or parameter 7551 are enabled, the AGC uses the lowest calculated derate power.
6.7.2 Derate parameters
These parameters define the derate function:
• Start derate at (6242/6252/6262): The value where the derating starts. The input selection (6241/6251/6261) determines the
units.
• Derate slope (6243/6253/6263): Used to calculate the power, based on the input (percent per unit). For example, if a 4-20 mA
input is used, then the derating is in %/mA. If the Pt100/Pt1000/RMI input is used, then the derating is in %/ °C.
• Derate limit (6246/6256/6266): This is the lower power derating limit, shown by P(limit) below.
DESIGNER'S HANDBOOK 4189341275A EN Page 123 of 196
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