Vacon NX User Manual

Technical data vacon • 19
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4
4. TECHNICAL DATA
4.1 Introduction
The VACON
®
NX_W Liquid-Cooled product range consists of active front ends, inverters, brake
choppers and AC drives. Figure 1 & Figure 2 presents the block diagram of the VACON
®
NX Liquid-
Cooled inverter and AC drive. Mechanically, the product consists of two units, the Power Unit and
the Control Unit. The power unit can contain one to six modules (cooling plates), depending on the
drive size. Instead of air, VACON
®
NX Liquid-Cooled inverters and AC drives use liquid for cooling.
A charging circuit is embodied in the AC drives but not in active front ends, inverters or brake
choppers.
An external three-phase AC-choke (1) at the mains input together with the DC-link capacitor (2)
form an LC-filter. In AC drives, the LC-filter together with the diode bridge produce the DC-voltage
supply to the IGBT Inverter Bridge (3) block. The AC-choke also functions as a filter against High
Frequency disturbances from the mains as well as against those caused by the AC drive to the
mains. In addition, it enhances the waveform of the input current to the AC drive. In chasses with
multiple parallel line-rectifiers (CH74) AC-chokes are required to balance the line current between
the rectifiers.
The power drawn by the AC drive from the mains is mostly active power.
The IGBT Inverter Bridge produces a symmetrical, 3-phase Pulse Width Modulated AC-voltage to
the motor.
The Motor and Application Control Block is based on microprocessor software. The microprocessor
controls the motor basing on the information it receives through measurements, parameter
settings, control I/O and control keypad. The motor and application control block controls the motor
control ASIC which, in turn, calculates the IGBT positions. Gate drivers amplify these signals for
driving the IGBT inverter bridge.
The control keypad constitutes a link between the user and the AC drive. The control keypad is used
for parameter setting, reading status data and giving control commands. It is detachable and can
be operated externally and connected via a cable to the AC drive. Instead of the control keypad, a PC
can also be used to control the AC drive if connected through a similar cable (±12 V).
You can have your AC drive equipped with a control I/O board which is either isolated (OPT-A8) or not
isolated (OPT-A1) from the frame. Optional I/O expander boards that increase the number of inputs
and outputs to be used are also available. For closer information, contact the Manufacturer or your
nearest distributor.
The basic control interface and the parameters (the Basic Application) are easy to use. If a more
versatile interface or parameters are required, a more suitable application can be chosen from the
"All in One" Application Package. See VACON
®
NX All in One Application Manual for more
information on the different applications.
An internal brake chopper is available as standard for chassis CH3. For Ch72 (only 6-pulse) and
Ch74, it is available as internal option while in all other sizes the brake chopper is available as option
and installed externally. The standard product does not include a brake resistor. It should be
acquired separately.

Vacon NX Specifications

General

Product Type	AC Drive
Control Method	Scalar Control
Enclosure	IP00, IP21
Communication	Ethernet
Safety	STO (Safe Torque Off)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short Circuit
Ambient Temperature Range	-10°C to +50°C (with derating above +40°C)
Cooling Method	Air-cooled, Liquid-cooled