MDS-C1-SPA Series INSTRUCTION MANUALib1500152(eng)a.pdf - 第162页
4. Spindle Adjustment 4 - 71 (3) Changing the coil in the speed co ntrol mode When the motor's output chara cteristics listed on th e Mitsubishi m otor rating table are as follows, N2 is the coil changeover speed, a…
4. Spindle Adjustment
4 - 70
[Outline of operation]
A coil of the motor is changed when using a coil changeover motor. When changing the coil, change
the contactor connected outside by turning L coil selection signal ON/OFF during motor operation or
motor stop.
CAUTION
1. The motor will be in an uncontrolled state after the L-coil selection signal
has turned ON/OFF until the coil is fully changed over. Thus, when
changing coils during heavily cutting operations, the motor speed may be
dropped significantly, or the motor may be stopped. When cutting surface
precision is required, do not perform coil changeove r or avoid cutting du ring
rotation in this period.
2. In T
1
(During base shut-off time) in the figure of the previous page, the
spindle drive unit does not accept any input signal (forward run start
command, reverse run start command, orientation start command). Thus,
input those signals to the spindle drive unit, having TM(=T
1
+50ms) or more
timer secured after the L coil sele ction command signal (LCS) has been
changed as shown in the drawing below.
Instead of using a timer, those signals can be input after the "cha nging coil"
signal (MKC) is turned ON from OFF.
3. Base shut-off time T
1
is determined with the parameter SP059 (MKT)
setting value. In connection with the contacto r operation, the st andard value
will be 150ms. Thus, TM usually has to be set to 200ms or more.
[1] Using a timer
L coil selection command
signal (LCS)
T
M
Coil changeover timer
Each input signal
T
M
≧200ms
[2] Using the "changing coil" signal (valid only when MDS-B-SPA is used)
L coil selection command
signal (LCS)
T
1
Changing coil signal
(MKC)
Each input signal
4. Spindle Adjustment
4 - 71
(3) Changing the coil in the speed control mode
When the motor's output characteristics listed on the Mitsubishi motor rating table are as follows,
N2 is the coil changeover speed, and the following expression is established.
0≤N≤N2 is the low-speed coil usage range
N2<N is the high-speed coi l usage range
The method for inputting the L coil selection signal (LCS) to change from the low-speed coil range
N1 to the high-speed coil range speed N3 (vice versa) is explained in this section.
N1
N2 N3
Changeover
speed
High-speed coi l rangeLow-speed coil range
Speed N
Output
0
4. Spindle Adjustment
4 - 72
1) Stopping the spindle motor and changing the coil
With this method, the high-speed coil and low-speed coils are viewed as electronic gears that are
handled in the same manner as the mechanical gears.
<Example of N3 → N1 → N3 changeover sequence>
N3
N1
0
N3
0
Speed command
Motor rotation speed command
Start signal
(SRN or SRI)
Zero speed output signal
(ZS)
L coil selection command
signal (LCS)
L coil selected signal
(LCSA)
N1
ON
ON
ON
OFF
OFF
ON
ON
OFF OFF OFF
ON
ON
OFF OFF
(Note) (Note)
OFF
OFF
High-speed coil selection Low-speed coil selection High-speed coil selection
[1] If the speed command changes to N1 while the motor is rotating in N3 (hig h-speed coil range),
the motor is stopped once by the user's seq uence. After confirmin g that the zero speed outp ut
signal (ZS) has turned ON, the L coil selection command signal (LCS) is turned ON. After
changing from the low-speed coil to the high-speed coil, the start signal (SRN or SRI) is turned
ON again, and the motor is accelerated to N1.
[2] In the same manner, when changi ng the sp eed co mmand from N1 to N3, the motor is stop ped
once. After confirming that the zero speed output signal (ZS) has turned ON, the L coil
selection command signal is turned OFF. After changing from the high-speed coil to the
low-speed coil, the start signal is turned ON, and the motor is rotated at the spe ed of N3.
(Note) Provide a time longer than T
M
from when the L coil selection command signal (LCS) is input to
when the start signal turns ON. Or, set the sequence so that the start signal turns ON after the coil
changed signal (MKC) changes from ON to OFF instead of using a timer.