Mitsubishi Electric MELDAS C6 Interface Manual page 283

B con-
Signal name
tact
—
SPINDLE STOP
[Function]
In spindle control, S analog data (spindle speed) can be set to "0" by using this signal (SSTP).
Usually, the signal is not used alone, but combined with "Spindle gear shift" signal (SSFT)
explained later.
[Operation]
When the signal (SSTP) is turned ON, S analog data is set to "0". Analog data is restored when the
signal is turned OFF.
When "Spindle gear shift (SSFT)" signal turns ON while the signal is ON, S analog data which
corresponds to speed set by the spindle speed parameter is output.
"Spindle override (SP1~SP4)" is ignored while the signal is ON.
B con-
Signal name
tact
—
SPINDLE GEAR SHIFT
[Function]
This signal is used to run the spindle motor at low speed, when spindle gear is shifted, so that
spindle gear can be engaged smoothly.
[Operation]
When the signal (SSFT) turns ON, the S analog data equivalent to the low speed previously set by
parameter is output.
If gears are not engaged properly, the signal is turned ON. It should be noted that "Spindle stop"
(SSTP) signal should be ON beforehand to use the signal (SSFT).
Spindle gear shift speed is selected by "Spindle gear select" input (GI1, GI2).
The relation is as follows:
Spindle gear
Gear
select signal
stage
GI2
1 0
2 0
3 1
4 1
S analog data (spindle speed data) while "Spindle gear shift (SSFT)" signal is ON can be
determined from the formula shown below.
For example, if the gear selection input is the 1st stage (GI1= OFF, GI2= OFF), and the S analog
data max. value is "10":
S analog data for gear shift =
6. EXPLANATION OF INTERFACE SIGNALS
6.3 PLC Output Signals (Bit Type: Y***)
Signal
abbreviation
SSTP
Signal
abbreviation
SSFT
Spindle speed at
gear shift
GI1
0 Ssift1
1 Ssift2
0 Ssift3
1 Ssift4
Ssift1
Slimt1 × 10
6-3-86
1st spindle 2nd spindle
YD34 YD64
1st spindle 2nd spindle
YD35 YD65
Spindle speed
limit
Slimt1
Slimt2
Slimt3
Slimt4
3rd spindle
YD94
3rd spindle
YD95