Lenze SCF frequency inverter - Manual (Page 66)

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Lenze 13466146 EDBSF01 v24 EN
Appendix
Example 2: Speed Pot Setpoint and 4-20 mA Feedback
Speed Pot
1 2 5 6 11 12 2 13B 14 13A 13C 15 25 2
4-20 mA
Feedback
Start/Stop
Contact
Speed Pot 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 0-10 VDC (02).
- Close TB-13A to TB-2 to put the drive into PI mode. The Speed Pot 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. In this case,
one speed pot would serve two purposes: adjusting the setpoint when PI mode is enabled,
and adjusting the motor speed directly when 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
p and q 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.