Omron CP1L - 12-2007, Operation Manual

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274
Inverter Positioning
Section 5-3
(2) The encoder resolution times the counter multiplier times the gear ratio
equals the number of pulses output by the encoder for one motor shaft
revolution.
Example of
Calculating
Conversion Factor
Conditions
• Frequency for 1 revolution/s for inductive motor: 2 Hz (motor specification)
• Rotary encoder resolution: 1,000 pulses/revolution (encoder specifica-
tion)
• High-speed counter multiplier: x4 (PLC Setup)
• Gear ratio between motor and encoder shafts: 1/4 (machine specification)
Calculations
The factor goes into the formula as shown below.
For example, to output a power supply frequency of 10 Hz to the motor:
Frequency of internal pulse output = 500
×
10 Hz = 5,000 Hz = 5 kHz
Therefore, set a pulse output frequency of 5 kHz in the pulse output instruc-
tions (e.g., PLS2).
CP1L
Pulse output
instruction
Target frequency
Internal
pulses
Error
counter
Conversion formula
Inverter
Motor
Power
supply
frequency
Encoder
2
1000
×
4
×
1/4
500
×
Power supply frequency to motor (Hz)
Frequency of
internal pulse
output (Hz)
Power supply
frequency to
motor (Hz)