Rockwell Automation 160 SSC Series C FRN 7.xx - Manual (Page 57)

Parameters and Programming 5-19
Common Problems with PI Control
1. Drive direction is incorrectly set for PI control.
Ensure that the drive is operating with the clockwise direction indicator
illuminated.
2. Drive oscillates between 0 and 3 Hz.
• Check direction and polarity of analog input signal.
• Ensure that the drive is operating with the clockwise direction indicator
illuminated.
• Ensure the +10V DC wire is connected to TB3-2 and that the common is
connected to TB3-3.
• Check that parameters P81 - [PI Proportional Gain] and P82 - [PI Integral Gain]
are set to a value other than 0.00.
3. Drive accelerates too quickly resulting in an F05 - OverVoltage Fault.
• Lower P81 - [PI Proportional Gain] below its current value.
• Lower P82 - [PI Integral Gain] below its current value.
• Raise P31 - [Decel Time 1] above its current value.
• Raise P30 - [Accel Time 1] above its current value.
• Evaluate the need for a dynamic brake for the application.
4. Drive will only run off the internal frequency or does not control with the PI
process loop.
• Check that P46 - [Input Mode] is set to 9.
• Ensure that power was cycled for one minute after changing the P46 setting.
• Ensure that there is not a connection between TB3-7 and 8.
5. Nothing works properly.
• Set P56 - [Reset Functions] to 1 and press the Enter key.
• Press the Stop button to clear the F48 - Reprogram Fault.
• Cycle power to the drive.
• Confirm that wiring is correct.
• Reapply power and program according to this procedure.
6. PI does not function with DeviceNet.
• Firmware Version 7.05 and earlier only allows one P46 - [Input Mode] setting
to be active at one time (settings 2 or 6 for DeviceNet or setting 9 for PI).
• It is possible for users of Firmware Version 7.05 and earlier to set up PI
control via an external processor, such as a SLC500. Consult your processor
manual for specific instructions.