95
Motor brake and stop operation
4
PARAMETERS
(4) Pre-excitation signal (LX signal)
Turning ON the LX signal will apply excitation current during a stop to activate DC injection brake.
The deceleration-to-a-stop operation commanded by the LX signal decelerates the motor to 0r/min, then performs DC
injection brake operation, regardless of the Pr. 10 and Pr. 11 settings.
Performing the initial magnetic pole detection in advance will eliminate the start-up delay caused by the initial magnetic
pole detection. (Initial magnetic pole detection is performed when the LX signal is turned OFF and ON during a stop.)
To input the LX signal, set "23" in one of Pr. 178 to Pr. 182 (input terminal function selection) to assign the function to a
terminal.
The RY2 signal turns ON when the pre-excitation starts.
The signal stays ON as long as pre-excitation is activated even if the drive unit is in a stop status. The signal is OFF when
the output shutoff signal (MRS) is ON.
For the terminal used for the RY2 signal, set "33 (positive logic)" or "133 (negative logic)" in Pr. 190 or Pr. 192 (output
terminal function selection).
REMARKS
RUN LED on the operation panel is lit during pre-excitation, which is activated by turning the LX signal ON.
NOTE
Changing the terminal assignment using Pr. 178 to Pr. 182 (input terminal function selection) and Pr. 190 or Pr. 192 (output terminal
function selection) may affect the other functions. Set parameters after confirming the function of each terminal. (Refer to page
100.)
CAUTION
Stop-holding torque is not generated. Install a mechanical brake.
A PM motor is a magnet motor. High-voltage is generated at motor terminals while the motor is running. Do
not touch motor terminals and other parts until the motor stops to prevent an electric shock.
Parameters referred to
Pr. 13 Starting speed Refer to page 89
Pr. 178 to Pr. 182 (input terminal function selection)
Refer to page 100
(r/min)
ON
ON
STF
LX
Initial magnetic
pole detection
(approx. 100ms)
Initial magnetic
pole detection
(approx. 100ms)
Operation time of Pr. 11
DC injection brake while the LX signal is ON.
RY2
DC injection
brake
Rotation speed
Time
Time
ON ON
ON ON
(When Pr. 11 "0")
