Schneider Altivar 320 vs 630

Overview

In industrial automation, choosing the correct variable frequency drive (VFD) is essential for optimizing system efficiency, reliability, and lifecycle costs. Schneider Electric's Altivar family offers some of the most widely deployed motor control solutions globally. Within this ecosystem, the Altivar Machine ATV320 and the Altivar Process ATV630 represent two distinct product lines designed for fundamentally different industrial environments.

The Altivar 320 (ATV320) is engineered specifically for machine builders (OEMs). It is a highly robust, compact variable speed drive designed to control three-phase synchronous and asynchronous motors in open-loop systems. Highly cost-effective and physically versatile, the ATV320 features specialized safety functions and footprints tailored for integration into small-to-medium electrical cabinets and complex machinery.

The Altivar 630 (ATV630) belongs to Schneider's "Altivar Process" portfolio. It is an intelligent, services-oriented drive designed to manage large municipal, utility, and heavy-industrial processes. Crucially, the ATV630 is not merely a motor controller; it functions as an edge device, integrating comprehensive process monitoring, energy management dashboards, and specialized fluid custody and pump protection parameters directly within its native hardware.

Understanding the technical boundaries between the machine-oriented ATV320 and the process-centric ATV630 ensures system designs achieve maximum efficacy and uptime.

Key Differences at a Glance

Specifications Comparison

Performance & Capabilities

Motor Control Competency

The ATV320 boasts exceptional dynamic open-loop capability, rendering it highly effective for applications requiring sudden, high-torque adaptation, such as material handling conveyors, hoists, and indexers. Its ability to command permanent magnet motor architectures in open loop reduces operating costs for machine builders trying to adhere to modern IE4/IE5 premium efficiency initiatives.

The ATV630 focuses heavily on system efficiency over dynamic step-response times. It supports advanced Synchronous Reluctance (SynRM) motors without encoder feedback, allowing process engineers to deploy highly efficient rotor layouts in centrifugal pumping systems. Under quadratic (variable) torque applications (such as large industrial fans or centrifugal pumps), the ATV630 utilizes customized law algorithms to reduce electrical consumption in real-time, matching output frequency directly to actual hydraulic demand.

Safety Capabilities

Functional safety is a standout capability for the machine-oriented ATV320. Unlike typical mid-range drives that only incorporate Safe Torque Off, the ATV320 integrates five distinct safety functions certified to SIL3 / Category 3 / PL e:

• Safe Torque Off (STO): Prevents unexpected motor restart.
• Safe Stop 1 (SS1): Decelerates the motor safely before removing power.
• Safely-Limited Speed (SLS): Keeps the motor below a programmed speed boundary.
• Safe Maximum Speed (SMS): Prevents the motor from exceeding standard operational limits.
• Guard Door Locking (GDL): Coordinates output signals to manage mechanism locking guards.

Conversely, the ATV630 focuses on system protection and diagnostic safety. It features hardware-embedded Safe Torque Off (STO) certified up to SIL3 / PL e. However, it lacks the broader array of mechanical/guard safety functions natively found on the ATV320, because process utilities rely on continuous running states and external safety architectures rather than rapid, localized operator interactions.

Fluid & Process Protection

The ATV630 possesses dedicated pump/utility macro-control blocks, featuring:

• Anti-Jamming: Clears pump impellers automatically by running programmed reverse-forward cycles when an overtorque state is flagged at start.
• Pipe Fill Management: Gently ramps the drive to prevent hydraulic shock (water hammer) within complex piping infrastructure.
• Multi-Pump Controllers: Manages lead-lag and assist-pump sequencing for up to 3 standard parallel pumps without requiring external PLCs.

The ATV320 does not include these pump-specific macros natively, as its application focus centers on general mechanical machinery.

Programming & Software

Engineers can configure both the ATV320 and ATV630 using Schneider’s foundational commissioning software, SoMove. SoMove simplifies the setup process by permitting offline parameter configurations, system diagnostic reviews, and real-time oscilloscope tracking via PC.

                  ┌──────────────────────┐
                  │    SoMove Software   │
                  └──────────┬───────────┘
                             │
            ┌────────────────┴────────────────┐
            ▼                                 ▼
┌───────────────────────┐         ┌───────────────────────┐
│     ATV320 (Machine)  │         │     ATV630 (Process)  │
├───────────────────────┤         ├───────────────────────┤
│ • ATV Logic Built-in  │         │ • Embedded Web Server │
│ • 150 Function Blocks │         │ • Asset Diagnostics   │
│ • OEM Customization   │         │ • Pump Curve Import   │
└───────────────────────┘         └───────────────────────┘

Despite the shared programming utility, their localized logic capabilities differ significantly:

ATV320 Programming

The ATV320 contains ATV Logic, an integrated programmable controller environment. This permits users to write basic relay-ladder or function-block diagrams (up to 150 logical execution blocks) to manage localized I/O directly within the drive. This feature can completely eliminate the need for a micro-PLC in simple machinery like tension winders or small sorting arrays.

ATV630 Programming

The ATV630 does not feature free-form ladder PLC logic programming in the manner of the ATV320. Instead, it utilizes an configuration-driven firmware system with integrated Web Server capabilities. By logging in through a standard Ethernet browser interface without installing specialized host software, users can:

• Configure process setpoints and proportional-integral-derivative (PID) loop parameters.
• Import pump-specific head/flow (H-Q) curve characteristics to calculate exact operating efficiencies.
• Read dynamic thermal models of both drive and motor to implement preventative maintenance measures.

Communication & Networking

The integration of VFDs within industrial Ethernet topologies demonstrates the core architectural divide of these two series.

ATV320 Networking

The ATV320 is typically deployed as a sub-device within a machine control panel. Thus, it features standard, simple terminal-based connections: Modbus RTU and CANopen. If premium fieldbuses like EtherNet/IP or Profinet are required, engineers must purchase and insert dedicated option cards into the drive’s expansion slot.

ATV630 Networking

Because the ATV630 is engineered as an open IoT edge-device, it features native, standard, dual-port Ethernet capabilities supporting both EtherNet/IP and Modbus TCP right out of the box. These dual RJ45 ports are managed on an internal switch layer supporting Ring Line topologies and Device Level Ring (DLR) protocols, ensuring that if an Ethernet cable breaks elsewhere in the production loop, the ATV630 maintains industrial control communication without losing connection to the SCADA system.

Furthermore, dynamic cyber-security protocols are implemented on the ATV630 to defend critical municipal water and energy control systems against unsanctioned access, including disabled port structures, password hashing, and firmware integrity validations.

Pricing & Lifecycle

The architectural choices between the two drives naturally affect their commercial positioning.

The Altivar 320 is positioned as a highly competitive, cost-optimized solution. Because it is meant for bulk consumption by machine builders (OEMs), its cost per unit is substantially lower. Its lifecycle outlook remains actively supported, acting as the standard modern replacement for older legacy workhorses like the Altivar 312 and Altivar 32.

The Altivar 630 represents a premium, long-term infrastructure investment. The inclusion of hardware-embedded harmonic reduction chokes, advanced service metrics, native dual-port Ethernet, and expansive enclosure options places its cost structure in a higher category. The ATV630 is active and serves as the official migration path for the discontinued legacy Altivar 61 series. It is designed for longevity, featuring long lifecycle support schedules in line with water/utility municipal standards.

When to Choose Each

Select the Altivar 320 If:

• You are a machine builder / OEM: Your machinery is replicated repeatedly, requiring a standardized layout, minimal cabinet footprint, and lower unit component costs.
• Cabinet space is limited: You require the drive to fit into narrow enclosures; here, the "Book" form factor (45mm footprint) excels by allowing side-by-side mounting without derating.
• Multifaceted safety is required: You must comply with modern machinery directives requiring Safe Stop, Safely Limited Speed, or Guard Door monitoring without deploying auxiliary safety relays.
• Localized logic is needed: The drive must execute unique sequence control locally via internal function block configurations, bypassing an independent PLC budget.

Select the Altivar 630 If:

• The application is fluid mechanics: You are running centrifugal pumps, multi-pump systems, wastewater aeration fans, or process compressors.
• Integrated networking is non-negotiable: The facility runs a modern, ring-topology Ethernet (Profinet, EtherNet/IP, or Modbus TCP) and demands real-time process visibility, remote diagnostic web interfaces, and SCADA monitoring.
• The power requirements exceed 15 kW: Applications require high-horsepower control, extending up to 800 kW, or demand specialized cabinet designs (IP55 washdown regions).
• Preventative maintenance is prioritized: You want the drive to actively track and report energy efficiency, dynamic system changes, or schedule-based maintenance alerts for the mechanical assets themselves.

Migration & Upgrade Path

For facilities running legacy plant infrastructure, upgrading to current Altivar platforms is simplified via structured conversion paths:

┌─────────────────────────────────┐       ┌─────────────────────────────────┐
│     LEGACY DRIVES (Obsolete)    │       │     CURRENT DRIVES (Active)     │
├─────────────────────────────────┤       ├─────────────────────────────────┤
│ • Altivar 312 / Altivar 32      ├──────►│ • Altivar 320                    │
│ • Altivar 61 (Pumps/Fans)       ├──────►│ • Altivar 630 (Process)         │
└─────────────────────────────────┘       └─────────────────────────────────┘

• Upgrading Legacy ATV312/ATV32 to ATV320: The ATV320 inherits the exact physical terminal patterns and mounting plates of previous generation machine drives. Furthermore, SoMove permits the importation of configuration files directly from older ATV312 and ATV32 programs, keeping parameter reconfiguration time down to a minimum.
• Upgrading Legacy ATV61 to ATV630: The ATV61 was long known as the premier variable-torque pump/fan drive. The ATV630 replaces it entirely, offering superior harmonic mitigation and significantly higher motor control performance. Schneider offers a complete range of mechanical adaptation plate plates and wiring transition kits, allowing engineers to retain previous panel setups during an ATV61-to-ATV630 physical migration.

Frequently Asked Questions (3-5 Q&A)

1. Can the Altivar 320 run closed-loop vector control with encoder feedback?

No, the ATV320 does not natively support encoder expansion cards for closed-loop dynamic motor tracking. For applications requiring strict closed-loop encoder vector performance in a machine format, use the Altivar Machine ATV340.

2. Can the Altivar 630 be used for high-overload crane or conveyor hoist applications?

While the ATV630 does feature a "Heavy Duty" rating setting (which increases overload capacity to 150% for 60 seconds with derated nominal current), it is not ideal for highly structural lifting or torque-holding applications. For hoisting and heavy-torque industrial dynamics, the process sister drive, the Altivar Process ATV930, is designed specifically for these conditions and features regenerator module options.

3. Does the Altivar 630 require external chokes to comply with harmonic regulations?

No. The ATV630 features integrated DC chokes embedded directly in its design for units rated above 0.75 kW. This design safely mitigates operating harmonics without requiring external installation space or extra panel components, ensuring compliance with standard industrial network regulations.

4. How do the IP rating options compare between the two drives?

The ATV320 is typically supplied as an IP20 drive for integration into a master electrical enclosure, though IP66 varainat ratings exist for decentralized placement on physical machinery. The ATV630 process system ranges from IP21 configuration formats for clean-room environments up to robust IP55 cabinets suited for wall mounting in wastewater treatment facilities without requiring secondary shelter structures.

Related Articles

• Configuring Multi-Pump Systems on the Altivar Process 630
• Integrating Altivar 320 Safety Functions within SIL3 Environments
• Step-by-Step Guide: Migrating from Altivar 61 to Altivar 630