Mitsubishi MELSEC-Q QD77MS, User Manual

Page: 696 / 976

13 - 37
Chapter 13 Control Sub Functions
[2] Wiring the hardware stroke limit
When using the hardware stroke limit function, wire the terminals of the servo
amplifier upper/lower limit stroke limit as shown in the following drawing.
(When "
Pr.22 Input signal logic selection" is set to the initial value)
When using the hardware stroke limit function with the external input signal via
CPU (buffer memory of QD77MS), wiring differs depending on the input module.
QD77MS
FLS
COM
24VDC
RLS
Servo amplifier
DI1
(FLS)
DICOM
24VDC
DI2
(RLS)
(Note): Wire the limit switch installed in the direction to which "Current feed value" increases as upper
limit switch and the limit switch installed in the limit switch installed in the direction to which
"Current feed value" decreases as lower limit switch. If inverting the install positions of
upper/lower limit switches, hardware stroke limit function cannot be operated properly. In
addition, the servomotor does not stop. Refer to Section 5.2.8 "Servo parameters" for details
about the "Rotation direction selection/travel direction selection (PA14)".)
Fig. 13.18 Wiring when using the hardware stroke limit
[3] Precautions during control
(1) If the machine is stopped outside the QD77MS control range (outside the
upper/lower limit switches), or if stopped by hardware stroke limit detection,
the starting for the "OPR control", "major positioning control", and "high-level
positioning control" and the control mode switching cannot be executed. To
carry out these types of control again, return the workpiece to the QD77MS
control range by a "JOG operation", "inching operation" or "manual pulse
generator operation".
(2) When "
Pr.22
Input signal logic selection" is set to the initial value, the
QD77MS cannot carry out the positioning control if FLS (limit switch for
upper limit) is separated from DICOM or RLS (limit switch for lower limit) is
separated from DICOM (including when wiring is not carried out).