Rockwell Automation 8510 AC Spindle Drive System User Manual - Manual (Page 69)

Interface Signal Descriptions
Chapter 7
7-65
In servo mode, an analog speed command is required but it can be applied
to either analog input. If the SERVO MODE – Analog In # programmable
parameter is set to “INPUT #1,” this input must be used for the servo mode
analog speed command. If the CNC or other control system has only a
single analog output and the drive must operate in servo mode for functions
such as spindle orient or C-axis machining on a turning center, the servo
mode speed command should be applied to this input.
If this input is used for both the spindle and servo modes, a given analog
input level may result in three different motor speeds. The different speeds
are dependent on the operating mode selected and the maximum speed
programmed for each operating mode. The SPINDLE MODE – Max Cmnd
Spd, SERVO MODE – LO SPD RANGE – Max Cmnd Spd, and SERVO
MODE – HI SPD RANGE – Max Cmnd Spd parameters define the scaling
to be used. The Spindle/Servo Mode Select and Servo Input Scaling -
Low/High inputs determine which factor will be used.
Analog Input #2 – CN9-39, 40, 41
During servo mode operation, if the SERVO MODE – Analog In #
programmable parameter is set to “INPUT #2,” this input must be used for
the servo mode analog speed command. If the CNC or other control system
has a separate analog output that is used for servo mode operation (like the
9/Series CNC when configured for C-axis machining on a turning center),
the servo mode speed command must be applied to this input.
In servo mode, the maximum motor speed at maximum command will be
changed based on the current state of the Servo Input Scaling Low/High
digital input. The programmed values of the LO SPD RANGE or HI SPD
RANGE menus will determine the maximum motor speed scaling that is to
be used for each input state.
The 8510 drive can also be configured to operate as a torque controlled
drive instead of a speed controlled drive. If the TORQUE MODE – Torque
Enable programmable parameter is set to “ENABLED,” the analog torque
command must be applied to this input and the SERVO MODE – Analog In
# programmable parameter must be set to “INPUT #1.” The Torque Mode
Enable (Accel/Decel Rate Select) input is used to switch between speed
controlled operation, either spindle mode or servo mode, using Analog
Input # 1 and torque controlled operation using Analog Input # 2.
In torque mode, the maximum analog input signal is always equal to the
maximum torque capability of the drive/motor combination.
Analog Outputs
Analog Output #1 – CN9-42, 43, 44
Analog Output #2 – CN9-45, 46, 47
The two analog outputs can be programmed to output one of several
different control variables. These variables include: