Optidrive ODP-2 User Guide Revision 2.10
8.2. Parameter Group 3 – PID Control
PID Controller Proportional Gain. Higher values provide a greater change in the drive output frequency in response to small
changes in the feedback signal. Too high a value can cause instability
PID Integral Time Constant
PID Controller Integral Time. Larger values provide a more damped response for systems where the overall process responds
slowly
PID Differential Time Constant
PID Differential Time Constant
0 : Direct Operation. Use this mode if an increase in the motor speed should result in an increase in the feedback signal
1 : Inverse Operation. Use this mode if an increase in the motor speed should result in a decrease in the feedback signal
PID Reference (Setpoint) Source Select
Selects the source for the PID Reference / Setpoint
0 : Digital Preset Setpoint. P3-06 is used
1 : Analog Input 1 Setpoint
2 : Analog Input 2 Setpoint
PID Digital Reference (Setpoint)
When P3-05 = 0, this parameter sets the preset digital reference (setpoint) used for the PID Controller
PID Controller Output Upper Limit
Limits the maximum value output from the PID controller
PID Controller Output Lower Limit
Limits the minimum output from the PID controller
0 : Digital Output Limits. The output range of the PID controller is limited by the values of P3-07 & P3-08
1 : Analog Input 1 Provides a Variable Upper Limit. The output range of the PID controller is limited by the values of P3-08 & the
signal applied to Analog Input 1
2: Analog Input 1 Provides a Variable Lower Limit. The output range of the PID controller is limited by the signal applied to
Analog Input 1 & the value of P3-07
3: PID output Added to Analog Input 1 Value. The output value from the PID Controller is added to the speed reference applied
to the Analog Input 1
PID Feedback Signal Source Select
0 : Analog Input 2
1 : Analog Input 1
2 : Output Current
3 : DC Bus Voltage
4 : Differential : Analog Input 1 – Analog Input 2
5 : Largest Value : Analog Input 1 or Analog Input 2
Maximum PID Error to Enable Ramps
Defines a threshold PID error level, whereby if the difference between the setpoint and feedback values is less than the set
threshold, the internal ramp times of the drive are disabled. Where a greater PID error exists, the ramp times are enabled to limit
the rate of change of motor speed on large PID errors, and react quickly to small errors.
Setting to 0.0 means that the drive ramps are always enabled. This parameter is intended to allow the user to disable the drive
internal ramps where a fast reaction to the PID control is required, however by only disabling the ramps when a small PID error
exists, the risk of possible over current or over voltage trips being generated are reduced.
PID Feedback Value Display Scaling Factor
Applies a scaling factor to the displayed PID feedback, allowing the user to display the actual signal level from a transducer, e.g. 0
– 10 Bar etc.
Sets a programmable level whereby if the drive enters standby motor whilst operating under PID control, the selected feedback
signal must fall below this threshold before the drive will return to normal operation.
0 : Continuous PID Operation. In this operating mode, the PID controller operates continuously, regardless of whether the drive
is enabled or disabled. This can result in the output of the PID controller reaching the maximum level prior to the drive enable
signal being applied.
1 : PID operation on Drive Enable. In this operating mode, the PID controller only operates when the drive is enabled, and hence
will always start from zero when the drive is enabled.
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