
1. DISPLAY AND OPERATION OF CRT/MDI
B–62755EN/01
60
This data indicates the status of the polygon synchronization mode.
#7
SC0470
#6
LGE
#5 #4
SCF
#3 #2 #1
PST
#0
SPL
#0 (SPL): Spindle polygon synchronization is in progress.
#1 (PST): Spindle polygon synchronization mode is starting.
#2: Spindle polygon synchronization mode is being released.
#3: The spindle speed is being changed in spindle polygon synchronization
mode.
#4 (SCF): The spindle speed has been changed in spindle polygon synchronization
mode.
#5: Not used
#6 (LGE): In spindle polygon synchronization mode, the two spindles have different
loop gains.
#7 (SC0): In spindle polygon synchronization mode, the specified speed is zero.
CAUTION
D If SPL and SCF are set to 1 and #1, #2, and #3 are set to 0 in polygon synchronization mode,
the operation is normal.
D If the status does not change, even though PST is set to 1 and the program is stopped in a block
including G51.2, one of the spindles cannot attain the polygon synchronization speed. This
may occur when the spindle cannot be activated because the PSTU bit (bit 7 of parameter No.
7603) is set to 0.
D LGE is set to 1 when the speed is changed in polygon synchronization mode if the serial spindle
control unit uses different loop gains for the first and second spindles during spindle
synchronization.
When this function is used, the two spindles must be controlled with an identical loop gain. The
warning is displayed in DGN, but the warning does not cause an alarm. (The serial spindle
control unit switches parameters according to the statuses of CTH1, CTH2, and other signals.)
D SCO is set to 1 if either of the following occurs: The combination of the programmed S value
and spindle control signals including *SSTP <G0029, #6>, SOV0 to SOV7 <G0030> and
multispindle control signal <G0027> causes 0 or a value smaller than the resolution of spindle
control to be programmed (the programmed value multiplied by 4095/highest–spindle–speed
is smaller than 1).
Alternatively, SIND control <G0032, G0033> is used and the programmed output is 0.
When SCO is set to 1, the spindle speed becomes 0, setting bit 0 of DGN 471 to 1 and disabling
the ratio of polygon synchronization rotation. This, however, is handled as a result of the
program, and does not cause P/S alarm No. 5018.
D Two–spindle polygon
machining
(T series only)