MA7200 PLUS Inverter 1 to 2 HP PID Fan and Pump Quick Start Manual

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PID Quick Start Guide for Fan and Pump Applications

PID is a control method that can be used for the purpose of automatically regulating flow or pressure in fan and pump applications. Following steps 1 through 13 listed below in this guide will simplify the start up of the MA7200 PLUS Inverter series for fan and pump applications using PID control. Some of the steps are specific to pump applications only and will be so noted. The guide is not intended to replace the MA7200 PLUS Installation and Operation Manual, and the user is urged review this manual.

The PID method of control covered by this guide will consist basically of a set-point(operating point, e.g. flow, pressure etc.) entered through the keypad and an analog transducer feedback signal (0 – 10 VDC or 4 - 20 mA). These two signals are then compared, and through PID processing, correct for any load or environmental changes to maintain the set-point. Only the (P) proportional and (I) integral parameters will be set and adjusted through the keypad to optimize performance. The parameter (D) derivative will not be discussed or used in this guide as the factory setting is usually sufficient for fan and pump applications. Actual values will be used to provide a realistic example of setting up PID control.

Although the inverter can be controlled via serial communication, it is beyond the scope of this guide and the user is referred to the MA7200 PLUS Installation and Operating Manual for further information on this subject.

Step 1 – Before starting the inverter –Safety First! Step 2 – Apply power to the drive.

Step 3 – Set drive to run mode.

Step 4 – Check fan or pump motor operation.

Step 5 – Making external digital input / output and analog feedback control wiring connections. Step 6 – Select stop / start method of control.

Step 7 – Setting minimum speed in pump applications. (Pump applications only) Step 8 – Select PID control and feedback input

Step 9 – Select engineering units. Step 10 – Setting PID parameters

Step 11 – Setting acceleration and deceleration. (Note 1)

Step 12 – Setting PID sleep functions. (Pump applications only) Step 13 – Testing the system.

Note 1 – The acceleration and deceleration parameters are not specific to PID control but are included as part of the PID set-up.

SAFETY FIRST!

Step 1 - Before Starting the Inverter

•Referring to the MA7200 PLUS Instruction Manual, please review and verify that the correct inverter size for the motor was received free of damage. To ensure personnel safety and to avoid equipment damage, follow the precautions and the installation procedures for mounting, wiring, and operating environment.

CAUTION - To avoid damage to the inverter when removing the inverter cover and/or LCD Operator, refer to Appendix B for the proper procedure.

•In accordance with applicable codes make electrical connections to the motor and input power terminals. (Refer to the block diagram, Fig. 4). No other external connections should be made at this time, as the initial control will be from the keypad.

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TECO – Westinghouse Motor Company