62 SF01U
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 13B14 13A 13C 15 25
2
4-20 mA
Feedback
Start/Stop
Contact
Keypad Setpoint Select
(PI Mode Enable/Disable)
- 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. See Note 2 below for more information.
NOTE
• 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.
• The PI setpoint reference or manual speed control reference and the PI
feedback cannot be the same signal. If the drive is mistakenly programmed
so that the reference signal is the same as the feedback signal, the
reference will default to the and buttons. For example, if PI MODE
(parameter 61) is set to NORMAL 0-10 VDC, the feedback signal must
be 0-10 VDC, so a 0-10 VDC signal cannot be used as the PI setpoint
reference or manual speed control reference.
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