Table 4-2

Parameter Block Definitions Level 2

Continued

Block Title

 

Parameter

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

BRAKE ADJUST

 

Stop Brake Time

 

The maximum number of seconds that DC injection brake voltage will be applied to the

Continued

 

 

 

motor windings after a stop command. After the time specified by this value, DC

 

 

 

 

injection braking is automatically turned off. If DC injection braking starts at a

 

 

 

 

frequency less than the DC brake frequency parameter, the stop brake time is

 

 

 

 

calculated as follows:

 

 

 

 

 

 

Brake Time + Stop Brake Time X

Output Frequency at Braking

 

 

 

 

DC Brake Frequency

 

 

 

 

 

 

 

 

Brake on Start

 

If set to ON, turns DC injection braking ON for a period of time (Start Brake Time) when

 

 

 

 

a run command is issued. This ensures the motor is not rotating. Braking will

 

 

 

 

automatically turn off and the motor will accelerate at the end of the start brake time.

 

 

Start Brake Time

 

The amount of time that DC injection braking will be applied after a run command is

 

 

 

 

issued. This will only occur if brake on start is set to ON. Braking may cause the

 

 

 

 

motor to overheat for applications that require frequent starts/stops. Be careful in

 

 

 

 

selecting this value. The start brake time should be just long enough to ensure the

 

 

 

 

motor shaft is not rotating when a start command is issued.

PROCESS

 

Process Feedback

 

The type of signal used for the process feedback in the PID setpoint control loop.

CONTROL

 

Invert Feedback

 

OFF – The process feedback signal is not inverted (no polarity change).

 

 

 

 

 

 

 

ON – Causes the process feedback signal to be inverted. Used with reverse acting

 

 

 

 

processes that use a unipolar signal such as 4-20mA. If “ON”, the PID loop will see a

 

 

 

 

low value of the process feedback signal as a high feedback signal and a high value

 

 

 

 

of the process feedback signal as a low feedback signal.

 

 

Setpoint Source

 

The source input reference signal type to which the process feedback will be compared.

 

 

 

 

If “Setpoint CMD” is selected, a fixed value that is entered in the setpoint command

 

 

 

 

parameter (of the Level 2 Process Control block) will be used.

 

 

Setpoint Command

 

The setpoint value for the PID loop that the control will try to maintain. This is only used

 

 

 

 

when the setpoint source parameter is set to “Setpoint Command”. Negative

 

 

 

 

percentage values are ignored in the PID loop if the feedback signal contains only

 

 

 

 

positive values (such as 0-10VDC).

 

 

 

 

Set PT ADJ Limit

 

The maximum frequency correction value to be applied to the motor (in response to the

 

 

 

 

maximum feedback setpoint error). For example, if the max output frequency is 60

 

 

 

 

Hz, the setpoint feedback error is 100% and the setpoint adjustment limit is 20%, the

 

 

 

 

maximum speed the motor will run in response to the setpoint feedback error is ± 12

 

 

 

 

Hz. (60Hz x 20%= 12Hz or a total of 24 Hz total output band-width centered around

 

 

 

 

the effective setpoint frequency).

 

 

 

 

At Setpoint Band

 

The operating band within which the at setpoint opto output is active (turned ON). This

 

 

 

 

feature indicates when the process is within the desired setpoint range. For example,

 

 

 

 

if the setpoint source is 0-10VDC and the at setpoint band value is 10%, the at

 

 

 

 

setpoint opto output will turn on if the process is within (10 x 10% = 1) ± 1VDC of the

 

 

 

 

setpoint.

 

 

 

 

Process PROP Gain

 

The PID loop proportional gain.

 

 

 

 

Process INT Gain

 

The PID loop Integral gain.

 

 

 

 

Process DIFF Gain

 

The PID loop differential gain.

 

 

 

 

Follow I:O Ratio

 

The ratio of the master input to the follower output. Requires the master pulse

 

 

 

 

reference/ isolated pulse follower expansion board. For example, the left number is

 

 

 

 

the master input rate. The number to the right of the colon is the follower output rate.

 

 

 

 

If you wish the follower to run twice the speed of the master, a 2:1 ratio is entered.

 

 

 

 

Fractional ratios such as 0.5:1 are entered as 1:2.

 

 

Process Type

 

Selects whether process control is Forward Acting or Reverse Acting.

 

 

 

 

 

 

 

MN715

Programming & Operation 4-21

Page 70
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Baldor 15H, Inverter Control manual Process

Inverter Control, 15H specifications

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