bnp-b2365(eng)b.pdf - 第83页
2. Wiring and Connection 2 - 44 (2) Protective functions [1] Base shutoff after a w inding changeover When the L-coil selection command (LCS) is used to perform low-speed winding → high-speed winding switching, or vice-v…
2. Wiring and Connection
2 - 43
2-7-2 Spindle coil changeover
There are spindle motors capable of coil changeover control, which enables favorable characteristics to
be attained from low speeds to high speeds by changing two types or three types (only for
MDS-C1-SPM) of coils.
(1) Coil changeover control
The speed at which to change the coils is detected by the spindle drive according to the value set
with spindle parameter SP020. This is conveyed to the NC with a speed detection (SD) signal. The
NC judges the other conditions (coil fixed, etc.), and issue a coil changeover command to the
spindle drive with the L coil selection command (LCS).
To prevent the contactor from varying, the hysteresis set with SP047 is applied on the speed when
changing from the low-speed coil to the high-speed coil and the high-speed coil to the low-speed
coil.
Speed detection (SD1) [SP→NC]
L coil selection command (LCS) [NC→SP]
Changing coil (MKC) [SP→NC]
Contactor changeover
0
2000
Time
6000
Spindle motor speed
(r/min)
Low-speed coil
4000
(SP020+SP047
High-speed coil
Low-speed coil
SP020
Spindle motor coil changeover control
No. Abbrev. Parameter name Description Setting range
Standard
value
SP020 SDTS* Speed detection
set value
Set the motor speed of which speed detection 1 output is
performed. Usually, the setting value is 10% of SP017 (TSP).
0 to 32767
(r/min)
600
SP047 SDTR* Speed detection
reset value
Set the reset hy steresis width for a speed detection set value
defined in SP020 (SDTS).
0 to 1000
(r/min)
30
2. Wiring and Connection
2 - 44
(2) Protective functions
[1] Base shutoff after a winding changeover
When the L-coil selection command (LCS) is used to perform low-speed winding → high-speed
winding switching, or vice-versa, the base is shut off during contactor operation time in order to
protect the spindle drive unit's main circuit. The base shutoff time is determined by the "Winding
changeover base shutoff timer" (SP059) setting. The standard time setting should be used, as a
shorter time can cause contactor burn damage.
(Refer to 5-2-2 (4) "Spindle control output 4" Coil changing (bit 6) for details.)
No. Abbrev. Parameter name Description Setting range
Standard
value
SP059 MKT* Winding
changeover base
shut-off timer
Set the base shut-off time for contactor switching at coil
changeover.
Note that the contactor may be damaged with burning if the
value of this parameter is too small.
50 to 10000
(ms)
150
[2] Current limit after coil changeover
Following a coil changeover, the current is limited (SP061) for the period specified by the current
limit timer (SV060) in order to stabilize control. Because position loop control (synchronous tap,
C-axis control, etc.) that occurs immediately after a coil changeover will result in unstable control,
be sure that position commands specified by the sequence is input after the current limit is
cancelled.
No. Abbrev. Parameter name Description Setting range
Standard
value
SP060 MKT2* Current limit timer
after coil
changeover
Set the current limit time to be taken after completion of
contactor switching at coil changeover.
0 to 10000
(ms)
500
SP061 MKIL* Current limit value
after coil
changeover
Set the current limit value during a period defined in SP060
(MKT2) after completion of contactor switching at coil
changeover.
0 to 120 (%) 75
2. Wiring and Connection
2 - 45
(3) Wiring
The illustration below shows the 2 types of changeover that occur after a coil changeover, (a) Y
(star) – ∆ (delta) changeover, and (b) Y (star) – Y (star) changeover. As shown in (c), one of the
contactors (MC1 or MC2) is turned ON and the other is turned OFF at all of the coil changeover
control circuits.
U
V
W
X
Y
Z
U
V
W
MC2
MC1
S
p
indle moto
r
Spindle drive unit
terminal block
MC1: Contactor to connect low-speed coil (Y-connection)
MC2: Contactor to connect high-speed coil (∆-connection)
(a) Y (star) - ∆ (delta) changeover circuit
U1
V1
W1
U2
V2
W2
U
V
W
MC1
Spindle motor
Spindle drive unit
terminal block
MC2
MC1: Contactor to connect low-speed coil (1st Y-connection)
MC2: Contactor to connect high-speed coil (2nd Y-connection)
(b) Y (star) - Y (star) changeover circuit
(c) Coil changeover control circuit (common)
Coil changeover relay control circuit
CN9-8
CN9-10
MDS-C1-SP
RA
MC1 SK
MC2
RA
S
T
MC2 SK
MC1
RA