How to Unlock S600, S300, or, S700 Drive When Downloading Firmware

If an S600, S300, S400, or S700 series drive locks up while downloading firmware or the PLC Macro program.  Hold the two arrow buttons below the drives display and cycle the drive’s +24 volt logic voltage.  Continue holding the two buttons for a few minutes after the drive has powered up.  This should unlock the drive allowing the user to download firmware to it.