YASKAWA SGD7C-***AMAA*** Product Manual page 635

Precautions When Using the Electronic Gear
When you use the electronic gear, make sure that IL08 (After Convert Increment Pulse)
does not exceed the double-length integer range (-2,147,483,648 to 2,147,483,647). If the
range is exceeded, the parameters (IL08 (After Convert Increment Pulse), IL0A (Current
Count Value After Converts), and IL0C (PL Latch Value After Converts)) of the Counter
Function Module, which are handled as double-length integers, may not be reported correctly.
 Conditional Expressions to Ensure the Parameters Are Within the
Range
Use the following conditional expression to make sure that IL08 (After Convert Increment
Pulse) does not exceed the double-length integer range.
Ts* (ms)
Input pulse maximum
×
frequency (Hz)
1000 (ms)
*
Set scan time
Use the following formula to calculate the workpiece travel distance per pulse.
Workpiece travel distance per pulse (reference units/pulse)
*1
No. 10
=
(Pre Quadrature)) (Number of Pulses per
*1.
This is the fixed parameter number.
*2.
The multiplier is the multiplier value set with fixed parameter No. 03 (Pulse Counting Mode Selection). (Example:
If pulses A/B with a multiplier of 4 are used, the multiplier is 4.)
× Travel distance per load shaft rotation (reference unit/pulse) ≤ 2,147,483,6471
(Travel Distance per Machine Rotation)
*1
No. 14 (Encoder Resolution
Encoder Rotation) × Multiplier
12.8 Counter Function Module
*1
No. 12 (Machine Gear Ratio)
×
*1
No. 11 (Encoder Gear Ratio)
*2
12.8.2 Electronic Gear
12
12-61