Lite-On Technology Corp.
Industrial Automation
163
between V-REF and GND. The voltage range input is -10V ~ +10V. The rotation speed
corresponding to the voltage is adjustable (PA-17).
If either SPD0 or SPD1 is not 0, the speed command is the internal parameter. The command
becomes effective right after the change between SPD0 and SPD1.
The setting for the parameter of the internal register is between -50000 and 50000. Setting value =
Setting range x unit (0.1r/min)
E.g.: PA-14 = +30000. Setting value of rotation speed = +30000 x 0.1r/min = +3000r/min
The speed command discussed in this section can be treated as the speed command under the speed
mode (S or Sn). It can also be input as the command of speed limit under the torque mode (T or Tn).
7.3.2. Control structure of the speed mode
The processing unit of speed command selects the source of speed command based on 7.3.1. The
selection includes the size of command represented by the analog voltage set by the proportioner (PA-
17), as well as the S-curve used for smoothing the speed command. The speed control unit manages the
gain parameter of the drive and computes the command of the current supplied to the motor promptly.
The resonance suppression unit is used to suppress the resonance of machinery structure. The units are
explained as follows:
First, the functions regarding the Processing unit of speed command are introduced. The structure
diagram is as below:
Processing unit of
speed command
Processing unit of
speed control
Processing unit of
resonance suppression
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