Description Of Operation - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function
14.30 Real-Time Tuning 2 (Rapid Traverse Time Constant)

14.30.3 Description of Operation

The derivation of optimum time constant and the timing for switching to optimum time constant of this function are described
below.
When this function is enabled, the parameters are switched to the optimum time constant internally based on the obtained
estimated inertia ratio.
Parameter
#2004 G0tL (G0 time constant)
#2007 G1tL (G1 time constant)
#2158 G1btlx (Per-axis pre-interpolation cutting feed time constant)
Derivation of optimum time constant
The optimum time constant is derived based on the relation between the estimated inertia ratio and the optimum time
constant as shown below.
Relation between the estimated inertia ratio and the optimum time constant
Acceleration/deceleration
time constant [ms]
tmax
tmin
JL
tmax: Maximum value of switching time constant
tmin: Minimum value of switching time constant
trng: Time constant changeover range
JL: Load inertia scale
RTJX: Real-time tuning: maximum adaptive inertia ratio
Variable definitions in each case are given below.
tmax: Maximum value of switching
time constant
#2004 G0tL
(G0 time constant)
#2007 G1tL
(G1 time constant)
#2158 G1btlx
(Per-axis pre-interpolation cutting feed
time constant)
IB-1501668-B
Only when variable-acceleration pre-interpolation
acceleration/deceleration is enabled.
trng
RTJX
tmin: Minimum value of switching
time constant
#2653 RT2G0tL
(RT2: Minimum value of G0 acce/dece
time constant)
#2654 RT2G1tLA
(RT2: Minimum value of acce/dece
time constant after G1 interpolation)
#2655 RT2G1tLB
(RT2: Minimum value of acce/dece
time constant before G1 interpolation)
776
Remarks
Estimated inertia ratio [%]
trng: Time constant switching range
#2656 RT2G0rng
(RT2: Changing amount of G0 acce/dece
time constant)
#2657 RT2G1rngA
(RT2: Changing amount of acce/dece time
constant after G1 interpolation)
#2658 RT2G1rngB
(RT2: Changing amount of acce/dece time
constant before G1 interpolation)