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2. Wiring and Connection
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(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