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FANUC Series16i/160i-LB, Gap Control Axis High-Speed Approach Function, Specification Additional Manual Page 3

Additional Manual
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nition
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FANUC Series 16i/160i -LB
Gap control axis high-speed approach function
A – 78797E
02.05.06
Contents
Date
Design
M.Sato
Title
Drawing
Page
04 2004.07.29 M.Sato NPDS signal has been added.
03 2004.05.20 M.Sato All pages has been changed.
02 2002.09.03 M.Sato Page 7 Error in writing correction
- High-speed approach operation
The approach operation when the gap control axis high-speed approach function is effective
is as follows.
(1) When the gap control is started, the gap control axis starts the approach operation at the
approach speed (PRM No.15845).
Please set the acceleration time constant (PRM No.15846) beforehand.
The acceleration time is the time spent so that gap control axis can reach approach
speed.
(2) The gap control axis starts decelerating to shift to the standard approach operation when
entering either of the following states.
a) The absolute value of gap deflection is smaller than the deceleration starting
deflection (PRM No.15848).
b) The deceleration starting signal *APDEC is input to CNC directly.
Please set the deceleration time constant (PRM No.15847) beforehand.
The trigger of the deceleration can be selected by PRM No.15840#2(GDS) whether the
deceleration starting deflection or the deceleration starting signal is used.
(3) The gap control axis high-speed approach function ends when the speed of the gap
control axis slows more than the speed of the standard approach operation. (Point-a)
After that, the standard approach which moves at the speed proportional to the gap
deflection is operated.
Lm : Upper limit of detection distance of gap sensor (= maximum gap deflection)
Lw : Surface of work-piece
Ld : The deceleration starting deflection (PRM No.15848)
Fa : The approach speed at the approach operation (PRM No.15845)
T
c1 : The acceleration time constant (PRM No.15846)
T
c2 : The deceleration time constant (PRM No.15847)
Fa
Tc1
0
－
Tc2
a
Ld
Lm Lw
Feedrate
Horizontal axis : Distance from the standard point of gap
Amount of gap deflection
Fi2. Feedrate of high-speed approach
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Contents Summary of FANUC Series16i/160i-LB, Gap Control Axis High-Speed Approach Function, Specification Additional Manual

  • Page 1FANUC Series16i/160i-LB Gap control axis high-speed approach function Specification Copyright  2004 FANUC LTD. FANUC Series 16i/160i -LB Title Gap control axis high-speed approach function 04 2004.07.29 M.Sato NPDS signal has been added. Drawing A – 78797E 03 2004.05.20 M.Sato All pages has been ch
  • Page 2Outline The approach speed of the gap control function is controlled according to the value multiplied the gap control gain and the gap deflection. The larger the gap control gain is set, the faster the approach speed is and the shorter the approach time is. However, raising the gap control gain too
  • Page 3- High-speed approach operation The approach operation when the gap control axis high-speed approach function is effective is as follows. (1) When the gap control is started, the gap control axis starts the approach operation at the approach speed (PRM No.15845). Please set the acceleration time con
  • Page 4Operation at Pierce point The gap control axis can be stopped at an arbitrary position to pierce a hole while approaching. The procedure is explained with using the following example part program. (1) Specify PRM No.15840#4(LPP) for 1 and specify Pierce point stop signal (NPDS) for 1, and this opera
  • Page 5The gap control axis immediately stops without deceleration when the pierce point signal is set to 1. So, setting the piercing point signal to 1 with the axis moving at high speed might cause shock in the machine. Please slow down the gap control axis by using the deceleration beginning signal (* AP
  • Page 6Signals - Deceleration starting signal *APDEC [Classification] Input signal (High-speed DI interface) [Function] This signal makes the approach speed shift from the parameter value to the value calculated by gap control. The high-speed approach operation is ended and the gap control axis start
  • Page 7- Deceleration request receive signal NPDS [Classification] Input signal [Function] This signal notifies admitted input of Pierce point signal (LPP) to PMC. [Operation] The gap control axis is stopped if Pierce point signal is input when this signal is 1. The Pierce point signal is not acce
  • Page 8Parameter #7 #6 #5 #4 #3 #2 #1 #0 15840 LPP GDS TRB [Data type] Bit TRB Specify whether Gap control B function are enabled or disabled. 0: Disabled 1: Enabled GDS Specify the method of commanding the deceleration start of the gap control axis in the gap control axis high-speed approach function. 0:
  • Page 915847 Deceleration time constant [Data type] Word axis [Unit of data] msec [Valid data range] 0 to 32767 Specify the time from the approach speed to the stop.. Setting too large value to this parameter might cause touching the gap control axis to work-piece. Please be careful in case of changing thi
  • Page 1015855 Acceleration limit at approaching [Data type] Word axis [Unit of data] 0.1m/min2 [Valid data range] 0 to 32767 Specify the limit of acceleration for gap control speed. The servo over-current alarm may occur at gap control start, because the gap control axis starts without time constant of acce