Mitsubishi Electric M800VW Series Programming Manual page 653

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function
14.12 Chopping
 Compensation value sequential update method
Every chopping command starts with "0" compensation amount. Compensation amount is calculated every 4-cycle chopping
operation, and then the compensation is carried out.
[Prevent from updating the chopping compensation amount]
With the compensation value sequential update method, the stroke normally fluctuates by changing the speed of chopping
operation. Turn the stroke compensation completion signal OFF to update the compensation amount automatically.
However, if the amount of change in the chopping operation is small and the fluctuation of the stroke is small, it might not
need to update the compensation amount.
Use "Chopping compensation update prevented request" signal (CHPRCR) in this situation.
Chopping compensation update prevented signal (CHPRCC) is turned ON when the "Chopping compensation update
prevented request" signal (CHPRCR) is turned ON.
While "Chopping compensation update prevented" signal (CHPRCR) is turned ON:
 The chopping compensation is not updated.
 The stroke compensation completion signal does not turn OFF.
When the control data is updated, turn "Chopping compensation update prevented request" signal (CHPRCR) OFF and then
update the chopping compensation amount.
Chopping compensation update
prevented request (CHPRCR)
Chopping compensation update
prevented (CHPRCC)
Chopping override (CHPOV)
Stroke compensation co mpletion
The chopping compensation amount
(*1) Chopping compensation amount when the chopping override (CHPOV) is worth 100 %.
(*2) Chopping compensation amount when the chopping override (CHPOV) is worth 80%.
(*3) Chopping compensation amount when the chopping override (CHPOV) is worth 70%.
 Compensation value fixed method
Compensation amount fixed method includes the record mode and the playback mode.
[Record mode]
 Override, command axis, upper/bottom dead center point position, number of cycles, and compensation amount are
recorded as the chopping control data.
 Compensation amount record area is specified with R register.
 Compensation amount record area is determined by the number of R registers to be secured. 14 consecutive R registers
are required for 1 set of record.
 Compensation amount is always updated in the record mode.
[Playback mode]
 Chopping operation is started using the data (override, command axis, upper/bottom dead center point position, number of
cycles, compensation amount) recorded in the record mode.
Compensation amount is not calculated during playback mode.
IB-1501668-B
100 % 80 %
(1) Computing (2)
632
90 % 70 %
Computing (3)