User manual

2 Overview of the NX series
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2 Overview of the NX series
The NX Series tuning-free AC servo motor unit is a product consisting of a high-performance motor equipped
with 20-bit absolute encoder, and a driver supporting four control modes based on position, speed, torque and
tension.
When used with the optional data-setter OPX-2A or the data setting software MEXE02 (both are sold
separately), you can set parameters and data using the switches on the driver and also access extended
functions.
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Main features
• Stable operation without tuning
• The automatic tuning function ensures stable operation of the equipment regardless of its mechanism. If the
present response is insufficient, all you need is to adjust the mechanical rigidity setting switch and the
motor will operate with higher response.
• With an internal potentiometer, setting of damping control frequency is easy. Even if the motor is
assembled into a machine of low rigidity, you can suppress residual vibration during positioning, in order
to improve compliance.
• Automatic tuning supports an adjustment range of up to 50 times the rotor inertial moment, while manual
tuning supports an adjustment range of up to 100 times.
• Selection from four control modes
You can set one of four control modes using the control mode setting switches on the driver.
• Position control mode.......... Positioning operation is performed based on input pulses.
• Speed control mode............. The operating speed is controlled via I/O signals.
• Torque control mode ........... The motor is operated at a constant torque.
• Tension control mode .......... The generated torque and speed of the motor are adjusted to maintain a
constant tension during winding and unwinding operations.
• Separate main power supply and control power supply
A separate 24 VDC power supply is connected to supply control power, independently of the main power
supply. This way, the motor position can be detected and contents of alarms can be checked while the
24 VDC power is supplied, even when the main power is cut off.
• Supporting sink output and source output
The driver supports both the current sink output circuit and the current source output circuit. (Line driver
output is not supported).
• Automatically controlled electromagnetic brake
Since the driver automatically controls the electromagnetic brake, all you need is to connect a 24 VDC power
supply and the electromagnetic brake will operate. This saves time to adjust the timings of control signal
inputs and design a ladder program.
• Alarm and warning functions
The driver provides alarms that are designed to protect the driver from overheating, poor connection,
misoperation, etc. (protective functions), as well as warnings that are output before the corresponding alarms
generate (warning functions).
• Absolute system
Connect the optional battery BAT01A (sold separately) and use the driver in the position control mode, and
your NX series will effectively comprise an absolute system.
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Extended functions
When used with the optional data-setter OPX-2A or the data setting software MEXE02 (both are sold
separately), the NX series driver lets you set desired parameters, operation mode, resolution and other items
according to the needs of your equipment.