Acceleration/Deceleration Adjustment - Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual

8.4 Acceleration/deceleration adjustment

Using the speedometer output (CN3) described in section "6.5 D/A Output Function", measure the
acceleration/deceleration waveform, and check whether it is within ±15% of the theoretical
acceleration/deceleration time.
(Note: Refer to Appendix 3 for the calculation method of the theoretical acceleration/deceleration
time. )
(1) If the acceleration/deceleration time does not match the theoretical value
• The acceleration/deceleration time will not necessarily match the theoretical value when
there is an error in the GD
Check the load GD
• The friction torque is probably large if the acceleration time is long and the deceleration time
is short. Check the load meter value (SPINDLE MONITOR screen) at the max. speed. If it is
10% or more, the friction torque is probably comparatively large. It can be surmised that
mechanical friction is present in the bearing, timing belt, etc. Measure the
acceleration/deceleration time again after executing a test operation once.
∗ Regardless of whether a problem exists in the details above, the spindle motor and amplifier
are probably not the specified type, or there is probably a mistake in the parameters if the
acceleration/deceleration time does not match the theoretical value. Check the spindle motor
and amplifier type again, and also check the parameters.
(2) If the deceleration time is longer that the acceleration time (note that this is when the acceleration
time is within ±15% of the theoretical value)
• The time can be adjusted with the following procedure.
1) Spindle parameters
Abbre-
No. Name
viation
SP087 DIQM Variable torque
limit
magnification
during
deceleration
Target value
SP088 DIQN Variable torque
limit
magnification
during
deceleration
Change start
speed
8. Adjustment Procedure
2
of the motor shaft conversion.
2
again.
Details
Set the minimum variable torque limit
value during deceleration.
Set the speed at which the torque limit
value starts to change during deceleration.
Torque limit
Inverse proportion
speed
(Note)
Refer to the flow chart on the next page
for the procedure to change the SP087
and SP088 settings. (SP088 does not
require changing.)
Adjust the deceleration time to the
same time as the acceleration time
using SP087.
8 − 7
Standard
TYP CNG
setting
DEC 75
DEC 3000
Speed
Allowable
Unit
setting range
% 0 ~ 150
r/min 0 ~ 32767