Deceleration Coil Changeover Valid Function By Emergency Stop - Mitsubishi Electric MDS-E Series Instruction Manual

MDS-E/EH Series Instruction Manual
6 Spindle Adjustment

6.1.9 Deceleration Coil Changeover Valid Function by Emergency Stop

If a large workpiece is mounted on a large workpiece chuck in lathe, the acceleration/deceleration time increases
because of the increase of the total inertia. When the deceleration stop time at emergency stop exceeds the upper limit
value (29900ms) of the gate shutoff delay time (SP055), the spindle motor will coast.
This function enables the coil changeover motor to change to low-speed coil during emergency stop and if the
deceleration time is reduced to complete within the gate shutoff time, the spindle enters an emergency stop state.
Max. delay time only
Emergency stop
Low-speed coil
command
After the elapse of maximum delay time,
the motor cannot stop but caost
【#13225】 SP225 SFNC5 Spindle function 5
bit 8 : mken Coil switch allowance in deceleration control
This enables a coil changeover while decelerating after an emergency stop for a spindle motor with
coil changeover specification. A coil changeover may enable an excessive load inertia to stop within
the maximum delay time.
0: Normal (Disable)
【#13055】 SP055 EMGx Max. gate off delay time after emergency stop
Set the time required to forcibly execute READY OFF after the emergency stop is input.
Normally set to "5000".
When 5000ms or more is set for deceleration time constant at emergency stop (SP056), set the
same value as SP056.
When using the power backup system (MDS-D/DH-PFU) and setting the value of this parameter to
5000ms or more, a communication error between NC and drive unit may occur when power restarts
after a instantaneous power interrupt.
It is not a problem so turn the NC power ON again to start up.
When "0" is set, 7000ms is the actual value to be set.
---Setting range---
0 to 29900 (ms)
【#13056】 SP056 EMGt Deceleration time constant at emergency stop
Set the time constant used for the deceleration control at emergency stop. Set the time required to
stop from the maximum motor speed (TSP).
When "0" is set, the deceleration control is executed with "7000ms".
---Setting range---
0 to 29900 (ms)
IB-1501229-F
High-speed
coil
Low-speed coil
bit8=0
Disable
Deceleration
Coast
Max. delay time （29900ms）
1: Enable
Max. delay time+Coil changeover enabled
Emergency stop
High-speed
coil
Low-speed coil
command
Deceleration
Deceleratie using
low-speed coil
Max. delay time
Because of the changeover to high-speed coil,
deceleration finishes in time and the motor stops
354
Low-speed coil
bit8=1
Enable
Stop
（29900ms）