5.3 Description of Function Codes 5.3.9 d codes (Applied functions 2)
Hold line speed control frequency in the memory -- “LSC-HLD” (Function code E01 to E09, data = 71)
If “LSC/HLD” is ON under line speed control frequency, stopping the inverter (including an occurrence of an alarm
and a coast to stop command) or turning OFF “Hz/LSC” saves the current frequency command compensating for
a take-up roll getting bigger, in the memory. At the time of restart, the saved frequency command applies and the
inverter keeps the line speed constant.
Disable (No saving operation)
Enable (Saving the frequency command compensating for a take-up roll getting bigger)
Shutting down the inverter power during operation stop loses the frequency compensation data saved in
the memory. At the time of restart, therefore, the inverter runs at the frequency without compensation so
that a large overshoot may occur.
Function codes d153, d154, and d158 to d169 have been added to extend the constant surface speed control
function. These extension functions are used when wishing to perform constant surface speed control with an
encoder mounted on the motor shaft, or when wishing to perform operation by calculating the roll winding
diameter to compensate the line speed setting.
These function codes are reserved for particular manufacturers. Unless otherwise specified, do not access these
function codes.
PG option Ch1/X terminal (Pulse train input)
(Input method, Encoder pulse count, Filter time constant, Pulse scaling factor 1, 2)
(Refer to F01)
Refer to the description of the function code F01 for details on the pulse rate input.
Starting characteristic (Auto search mode: for speed sensorless vector control)
Refer to the description of function code H09 for details on starting characteristics.
These function codes are reserved for particular manufacturers. Unless otherwise specified, do not access these
function codes.
d70 specifies a limiter for the PI value output calculated in speed control sequence under “V/f control with speed
sensor” or “dynamic torque vector control with speed sensor.”
A PI value output is within the “slip frequency x maximum torque (%)” in a normally controlled state.
If an abnormal state such as a temporary overload arises, the PI value output greatly fluctuates and it may take a
long time for the PI value output to return to the normal level. Limiting the PI value output with d70 suppresses such
abnormal operation.
• Data setting range: 0 to 100 (%) (assuming the maximum frequency as 100%)
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