Firmware Manual

9000X AF Drives

8-6 For more information visit: www.eaton.com

MN04004001E

August 2010

Description of Parameters

Figure 8-3: PID Controller Function as I-Controller

Figure 8-4: PID Output Curve with the Values of Example 2

Example 2:

Given values:

P1.1.12, P = 100%

P1.1.13, I-time = 1.00 s

P1.1.14, D-time = 1.00 s Min freq. = 0 Hz

Error value (setpoint – process value) = ±10% Max freq. = 60 Hz

As the power is switched on, the system detects the difference between the setpoint

and the actual process value and starts to either raise or decrease (in case the error

value is negative) the PID output according to the I-time. Once the difference between

the setpoint and the process value has been reduced to 0, the output is reduced by the

amount corresponding to the value of P1.1.13.

In case the error value is negative, the frequency converter reacts reducing the output

correspondingly. See Figure 8-4.

10%

Error = 10%

PID Output

Error Value

I-Part = 5 Hz/s

D-part

I-part

Error = 10%

Error = -10%

P-part = 5 Hz

P-part = -5 Hz

D-part

PID Output

Error Value