Par. e-03 terminal 27 digital input, Par. cl-21 setpoint 1, Par. cl-81 pid normal/ inverse control – GE Industrial Solutions AF-600 FP Fan and Pump Drive (460V_575V 150HP and above) User Manual
Page 105: Par. cl-93 pid proportional gain, Par. cl-94 pid integral time, E (par. cl-21 setpoint 1, Par. cl-22 setpoint 2 an, Par. cl-22 setpoint 2, Par. cl-21 setpoint 1 , par. cl-22 setpoint 2 an, Af-600 fp high power operating instructions
CL-21 Setpoint 1
Range:
Function:
0.000 Proc-
essCtrlUnit*
[-999999.999 - 999999.999 Proc-
essCtrlUnit]
Setpoint 1 is used in Closed Loop Mode to enter a setpoint reference that is used by the frequency con-
verter’s PID Controller. See the description of par. CL-20 Feedback Function.
NB!
Setpoint reference entered here is added to any other references that are enabled (see par. C-30 and
par. C-34).
CL-22 Setpoint 2
Range:
Function:
0.000 Proc-
essCtrlUnit*
[-999999.999 - 999999.999 Proc-
essCtrlUnit]
Setpoint 2 is used in Closed Loop Mode to enter a setpoint reference that may be used by the frequency
converter’s PID Controller. See the description of Feedback Function, par. CL-20 Feedback Function.
CL-81 PID Normal/ Inverse Control
Option:
Function:
[0] *
Normal
Normal [0] causes the frequency converter’s output frequency to decrease when the feedback is greater
than the setpoint reference. This is common for pressure-controlled supply fan and pump applications.
[1]
Inverse
Inverse [1] causes the frequency converter’s output frequency to increase when the feedback is greater
than the setpoint reference. This is common for temperature-controlled cooling applications, such as
cooling towers.
CL-93 PID Proportional Gain
Range:
Function:
0.50 N/A*
[0.00 - 10.00 N/A]
The proportional gain indicates the number of times the error between the set point and the feedback
signal is to be applied.
If (Error x Gain) jumps with a value equal to what is set in par. CL-14 Maximum Reference/Feedb. the PID controller will try to change the output speed equal to
what is set in par. F-17 Motor Speed High Limit [RPM]/par. F-15 Motor Speed High Limit [Hz] but in practice of course limited by this setting.
The proportional band (error causing output to change from 0-100%) can be calculated by means of the formula:
(
1
Proportional Gain
)
× (
Max Reference)
CL-94 PID Integral Time
Range:
Function:
20.00 s*
[0.01 - 10000.00 s]
The integrator adds over time (integrates) the error between the feedback and the setpoint reference.
This is required to ensure that the error approaches zero. Quick frequency converter speed adjustment
is obtained when this value is small. However, if too small of a value is used, the frequency converter’s
output frequency may become unstable.
E-03 Terminal 27 Digital Input
Option:
Function:
Same options and functions as par. E-##, except for Pulse input.
[0] *
No operation
[1]
Reset
[2]
Coast inverse
[3]
Coast and reset inv
[5]
DC-brake inverse
[6]
Stop inverse
[7]
External interlock
[8]
Start
AF-600 FP High Power Operating Instructions
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