• If the pre-excitation/servo ON (LX) signal is turned ON, output shutoff is canceled and the position control preparation
ready (RDY) signal is turned ON after 0.1 seconds. When the STF signal (forward stroke end) or the STR signal (reverse
stroke end) is turned ON, the motor rotates according to the command pulse. When the forward (reverse) stroke end signal
is turned OFF, the motor does not rotate in the corresponding direction.
Forward stroke end (STF)
Reverse stroke end (STR)
Position control preparation ready (RDY)
Forward rotation pulse train (PGP/PP)
Reverse rotation pulse train (PGN/NP)
Interface between the position module and the inverter.
• To operate an inverter using a positioning module, the interfaces for the position command pulse train must agree with
Differential line driver
Selecting the pulse train type (Pr.428)
• To select the pulse train input to the FR-A8AL, set "1" in Pr.419 after installing the FR-A8AL on the inverter.
Servo on (LX)
*: Wiring length : max. 2 m
*: Wiring length : max. 10 m
5.5 Position control under vector control and PM sensorless vector control
Input pulse frequency
Max 200k pulses/s
Max 500k pulses/s