60
- Set PI MODE (Parameter 61) to NORMAL 4-20 mA (02) or REVERSE 4-20 mA (04) depending
on the system. Refer to section B.1 to determine whether the system is normal or reverse acting.
- Set TB-13A FUNCTION SELECT (Parameter 10) to KEYPAD SETPOINT (12).
- Close TB-13A to TB-2 to put the drive into PI mode. The
!
and
"
buttons can then be used to
adjust the PI setpoint.
- Open TB-13A to TB-2 to disable PI mode and control speed directly by the method selected in
STANDARD SPEED SOURCE (Parameter 05). For example, if Parameter 5 is set to 0-10 VDC, a
speed pot could be used for manual speed control when the PI mode is disabled.
NOTE 1: When TB-13A is closed to TB-2, the drive's display will flash "PIC" to indicate the drive
is in PI Control mode. When TB-13A is opened, the display will flash "SPd" to indicate the drive is
in Speed Control mode.
NOTE 2: The setpoint reference and the PI feedback cannot be the same signal. If the drive is
mistakenly programmed so that the setpoint reference is the same as the feedback reference, the
setpoint reference will default to the
!
and
"
buttons.
B.7
SCF SERIES PI CONTROL WIRING EXAMPLES
The following diagrams illustrate the most common PI control configurations. The wiring and
corresponding parameter settings are given. In these examples, TB-13A is used to select the setpoint
reference (TB-13B or TB-13C could also be used for this function). The examples show a 2-wire
start/stop circuit.
Example 1: Keypad Setpoint and 4-20 mA Feedback
1
2
5
6
11
12
2
13B
14 13A
13C 15
25
2
4-20 mA
Feedback
Start/Stop
Contact
Keypad Setpoint Select
(PI Mode Enable/Disable)
