Process Mode Connections - Baldor 22H series Installation & Operating Manual

Section 1
General Information

Process Mode Connections

3-36 Receiving & Installation
The process control mode provides an auxiliary closed loop general purpose PID set
point control that is shown in Figure 3-17. The process control loop may be configured in
either of two ways.
1. Using two (2) inputs; a set point and a process feedback input. The error signal
(between the setpoint and the feedback signals) adjusts the speed or torque of
the motor to eliminate error.
2. Using three (3) inputs; a setpoint, process feedback and feedforward inputs.
Instead of waiting for an error signal to develop between the setpoint and the
process feedback signals, the feedforward signal adjusts the speed or torque of
the motor to reduce the amount of error that will develop between the feedback
and setpoint inputs.
The objective of either method is to force the process feedback to be as close to the
setpoint as possible and eliminate process error. Table 3-11 shows a matrix of Process
Mode Input Signal Compatibility for the Setpoint Source, Process Feedback and
Feedforward signals. Be sure to use this information to select the signal types and
expansion boards for your application.
Two Input Configuration
For 2 input operation, several parameters must be set as follows:
1. Level 2 Process Control block, "Process Feedback" parameter must be set to
the type of feedback signal used. The process feedback signal can be any
Analog input available at the J1 terminal strip or expansion board. Selections
are shown in Figure 3-17.
2. Level 2 Process Control block, "Setpoint Source" parameter must be set to the
type of set point being used.
A. A fixed value setpoint is a keypad programmed parameter value. To
program a fixed setpoint, do the following:
i. Set the Level 2 Process Control block, "Setpoint Source" parameter
to Setpoint CMD.
ii. Set the Level 2 Process Control block, "Setpoint CMD" parameter
to a value between –100% to +100% of the process feedback input.
B. If a variable value setpoint is used, the Setpoint Source must be set to any
available terminal strip or expansion board input not being used for the
process feedback input. Selections are shown in Figure 3-17.
3. Level 1 Input block "Command Select" parameter must be set to "None".
Three Input Configuration
For 3 input operation, several parameters must be set as follows:
1. Level 2 Process Control block "Process Feedback" parameter must be set to
the type of feedback signal used. The process feedback signal can be any
Analog input available at the J1 terminal strip or expansion board. Selections
are shown in Figure 3-17.
2. Level 2 Process Control block "Setpoint Source" parameter must be set to the
type of set point being used.
A. If a fixed value setpoint is used, set the Level 2 Process Control block,
Setpoint Source parameter to "Setpoint CMD". Set the Level 2 Process
Control block "Setpoint Command" parameter to a value between –100%
to +100% of the process feedback.
B. If a variable value setpoint is used, set the Level 2 Process Control block,
Setpoint Source parameter to any Analog1, Analog2 or expansion board
input not being used for the process feedback or the feedforward input.
Selections are shown in Figure 3-17.
MN722