LEESON Micro Series Compact Inverters User Manual

Page 76

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PID MODE

(PID MODE SELECT)

This parameter activates the PID function, and selects whether the PID control will be direct or reverse

acting . Refer to Section 19 .0 - MICRO Series PID SET POINT CONTROL . The following options are

available:

OFF

Disables the PID function to allow “standard” drive operation.

NORMAL

Enables the PID function for direct acting systems. An increase in the feedback variable

will cause a decrease in motor speed .

REVERSE

Enables the PID function for reverse acting systems. An increase in the feedback

variable will cause an increase in motor speed .

NOTE:

The REVERSE selection is not used to compensate for reverse acting feedback devices. If a reverse

acting feedback device is used, program Parameters 75 and 76 - FB @ MIN and FB @ MAX as described

in Section 19 .1 - FEEDBACK DEVICES .

When PID is enabled, and the drive is in REMOTE and AUTO mode, the drive will operate in a CLOSED

LOOP fashion, responding to the feedback signal in order to maintain the process set point. In this case,

the set point reference can be a 0-10 VDC or 4-20 mA signal, or the keypad. The SPEED REFERENCE

SOURCE indication in the CONTROL display will indicate VDC (0-10 VDC), IDC (4-20 mA), or AKB

(keypad), depending on the set point reference.

When PID is enabled, and the drive is in LOCAL and AUTO mode, the drive will also operate in a

CLOSED LOOP fashion. However, in this case, the only set point reference available is the keypad, and

the SPEED REFERENCE SOURCE indication in the CONTROL display will indicate AKB .

When PID is enabled, and the drive is in MANUAL and LOCAL or REMOTE mode, the drive will

operate in an OPEN LOOP fashion, responding directly to speed commands from the keypad only. The

SPEED REFERENCE SOURCE indication in the CONTROL display will indicate MKB .

When PID is disabled, the drive will operate in an OPEN LOOP mode, responding directly to speed

commands from either the keypad (MANUAL mode) or an analog input signal or preset speed (AUTO

mode).

PID FB

(PID FEEDBACK SOURCE)

This parameter selects the terminal to be used for the feedback signal, and can be set to TB-5A or TB-5B.

TB-5A is used for 0-10 VDC signals, and TB-5B is used for 4-20 mA signals .

NOTE:

The MICRO Series has only one analog input of each type, so the same type of signal cannot be

used for feedback and set point reference. For example, a 4-20 mA signal from a transducer could not be

used as a feedback signal if the set point is being controlled by a 4-20 mA signal from a PLC.

FB @ MIN

(MINIMUM FEEDBACK VALUE)

This parameter should be set to the value of the process variable that corresponds to the minimum

transducer feedback signal (0 VDC or 4 mA).

FB @ MAX

(MAXIMUM FEEDBACK VALUE)

This parameter should be set to the value of the process variable that corresponds to the maximum

transducer feedback signal (10 VDC or 20 mA).

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