322
Inverter Positioning
Section 7-3
Low-speed Operation
Using Minimum Output
Setting
An inductive motor driven with an inverter is different from a servomotor in that
the torque at low speeds is so low that it may not be possible to turn the motor
shaft at the minimum frequency. The CP1L-EL/EM provide a minimum output
setting the ensure a minimum output to enable positioning at low speeds even
when there are extremely few pulses in the error counter.
Absolute Positioning
The amount of movement (i.e., amount of rotation) is input to the high-speed
counter as feedback pulses. During inverter positioning, the present value of
the high-speed counter can be used as an absolute position.
Note
The absolute position will change if the present value of the high-speed
counter is changed or the high-speed counter is reset.
7-3-4
Specifications
Inverter Positioning
Specifications
Pulse frequency
Time
In-position width
Pulse Output Flag
In-position flag
PLS2
instruction
Error counter
present value
Error counter
error setting
Error Counter Error
Flag (Output value cleared.)
Error Counter Reset Bit
(Error counter cleared.)
Motor shaft
turned manually.
Error counter
error occurs.
Item
Specification
Applicable inverters
Inverter that receives frequency commands from an analog
input or via Modbus-RTU communications. (Control method:
V/f control, vector control, etc.)
Applicable motors
Depends on the inverter (e.g., squirrel-cage inductive motor)
Number of position-
ing ports and
response frequency
Two ports at 100 kHz (within the speed command range of the
pulse output instructions)
Inverter command
output method
Modbus-RTU communications commands or analog output
(from ladder program)
Present value coor-
dinate system
With origin: Absolute coordinate system
Without origin: Relative coordinate system
Present value range
32 bits: 8000 000 to 7FFF FFFF hex (range of position com-
mand values and present values for pulse output instructions)
Output modes
Continuous output (Number of pulses not specified.)
Independent mode (Number of pulses specified.)
Acceleration/decel-
eration control
Trapezoidal or S-curve acceleration/deceleration
Содержание CP1L-EL20DR-D
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Страница 34: ...xxxiv Software Licenses and Copyrights 7...
Страница 178: ...144 Connecting the CX Programmer Section 5 1 Click the Connect button to connect and then connection online is completed...
Страница 192: ...158 Trial Operation and Debugging Section 5 3...
Страница 250: ...216 Automatic Clock Adjustment and Specifying Servers by Host Name Section 6 7...
Страница 666: ...632 Trouble Shooting Section 11 7...
Страница 696: ...662 Standard Models Appendix A...
Страница 805: ...771 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 806: ...772 Connections to Serial Communications Option Boards Appendix F...
Страница 836: ...802 PLC Setup Appendix G...
Страница 838: ...804 TCP Status Transitions Appendix H...
Страница 840: ...806 Ethernet Network Parameters Appendix I...
Страница 842: ...808 Buffer Configuration CP1L EL EM Appendix J...
Страница 844: ...810 Ethernet Specifications Appendix K...
Страница 851: ...Index 817 work words 118 write protection 447...
Страница 852: ...818 Index...
Страница 854: ...820 Revision History...
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