Chapter 12 Descriptions of Parameter SettingsC2000 Plus
12.1-10-8
When this setting is different from the Pr.10-02 setting and the source of the frequency command
is pulse input (Pr.00-20 set to 4 or 5), it causes a four-time frequency problem.
Example1: Assume that Pr.10-01 = 1024, Pr.10-02 = 1, Pr.10-16 = 3, Pr.00-20 = 5, MI = 37 and
ON, then the pulse needed to rotate the motor one revolution is 4096 (102 × 44).
Example 2: Assume that Pr.10-01 = 1024, Pr.10-02 = 1, Pr.10-16 = 1, Pr.00-20 = 5, MI = 37 and
ON, the pulse needed to rotate the motor one revolution is 1024 (1024 × 1).
Setting procedure of MI8 single-phase pulse input:
1. Pr.00-20 = 4, Pulse input without direction command
2. Pr.10-01 set as the ppr number of each rotation
3. Pr.10-16 = 5, MI8 single-phase pulse input
MI8 input and PG2 input could both exist at the same time. But PG card Pr.10-00 and Pr.10-16
cannot be set as MI8 at the same time.
10-17
Electrical Gear A
10-18
Electrical Gear B
Default: 100
Settings 1–65535
The electrical gear ratio is a ratio of the controller to the drive for the motor PPR (Pulses Per
Revolution). For example, if the motor PPR of the controller is 10000, and the motor PPR of the
drive is 1024, then the electrical gear ratio for the PG card input is 1024/10000, and the electrical
gear ratio for the PG card output is 10000/1024.
Rotational speed = Pulse frequency/Encoder pulses (Pr.10-01) × Electrical gear A / Electrical gear
B
You can set the revolution easily using the electrical gear. When the encoder's resolution is 1024,
it means that the motor PPR is 1024. If the electrical gear ratio is 1, the motor encoder PPR is
1024. If the electrical gear ratio is 0.5, the corresponding motor PPR is 1 for every two pulse-train
commands.
If you set the electrical gear ratio incorrectly, overshot may occur.
Example:
Turn the screw with one revolution = 51.2 mm,
Set Pr.10-01 (Encoder PPR) = 1024,
Set Pr.10-17 (Electrical gear A) = 1024,
Set Pr.10-18 (Electrical gear B) = 500 (hand wheel specification = 500 PPR),
Set Pr.10-04 (Mechanical Gear A1 at Load Side) = 20,
Pr.10-05 (Mechanical Gear B1 at Motor Side) = 40.
Then, after setting the electrical gear ratio and mechanical gear ratio, hand wheel's one
revolution is equal to the motor’s one revolution, and is equal to the load’s two revolutions.
In this case, 1 revolution at the load side = 51.2 mm = 1/2 revolution at the motor side = 512
[1024/2] pulses = 1/2 revolution of the hand wheel = 250 [500/2] pulses. Thus, it can be referred
that 1 pulse command movement = 51.2 mm / 512 pulses = 0.1 mm/pulse or 1 mm movement for
10 pulses.
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