SERVOSTAR 640 (S64000-NA) – A Servo Amplifier That’s Still Doing Heavy Lifting on Factory Floors

Some products just refuse to go out of style, even years after their “official” production run winds down. The SERVOSTAR 640 is one of those. If you’ve spent any time around motion control panels — CNC machines, packaging lines, printing presses, robotics cells — there’s a decent chance you’ve seen this servo amplifier sitting inside a cabinet, quietly doing the job it was built for. And for a lot of facilities, it’s still doing that job today.

What the SERVOSTAR 640 Actually Is ?

The SERVOSTAR 640, part number S64000-NA, is a digital servo amplifier from the S600 series. In plain terms, it’s the drive that takes commands from your controller and turns them into precise, controlled motor movement — speed, torque, or position, depending on how your machine needs it to behave.

What made this drive stand out when it was introduced — and honestly, what still makes it relevant today — is how much flexibility Kollmorgen packed into it. This wasn’t a stripped-down, single-purpose amplifier. It was built to handle a wide range of applications right out of the box, without needing a completely different hardware variant for every use case.

A Closer Look at What’s Under the Hood

If you’re evaluating whether a SERVOSTAR 640 fits your application, here’s what you’re working with:

Power input: Direct connection to mains supply, rated 3 x 230V-10% up to 480V+10% at 50Hz, or 208V-10% up to 480V+10% at 60Hz — so it’s genuinely built for global use, not tied to one region’s power standard.

Current ratings: 40A rated output current, with an 80A peak — enough headroom for demanding motion profiles and quick acceleration bursts.

Feedback options: Selectable between resolver feedback or high-resolution encoder feedback, plus encoder simulation output (incremental 5V line driver, decimal or binary, or SSI in Gray or binary code) — useful when your system needs to pass position data downstream to another controller.

Control modes: Integrated torque control, speed control, and position control — all built into the drive itself, not bolted on as an afterthought.

Motion functions: Frequency/sign control, electronic shaft (gearing) mode, positioner mode, and CANopen support come standard. It also supports chaining multiple motion tasks together, handles both relative and absolute movements, and offers 16 different homing routines — which covers just about any homing scenario you’d realistically run into.

Setup and interface: Fully programmable over RS232, configured through Windows-based setup software (yes, it goes all the way back to Windows 95/98/2000/ME/NT support, through XP, Vista, and Windows 7 — a good reminder of how long this drive has been in service). It also has a built-in display and keypad on the front panel for local diagnostics and adjustments. If you want to go deeper on wiring, commissioning, and parameter setup, Kollmorgen’s own SERVOSTAR 640/670 Quick Start Guide is still the most reliable technical reference out there.

Expansion capability: An expansion slot supports optional fieldbus interfaces — PROFIBUS DP, SERCOS, DeviceNet, Ethernet, or additional I/O — so the same base drive can slot into very different plant network architectures.

Physical design: EMC filters are integrated up to the 20A frame sizes, all shielding is connected directly (which matters a lot for noise-sensitive applications), and the smaller frame sizes are compact enough to fit into electrical cabinets as shallow as 300mm — a detail that panel builders and retrofit engineers will appreciate. It also supports parallel DC-bus connection using a patented braking resistor technique, useful in multi-axis setups where you want to share braking energy across drives instead of dumping it separately on each one.

Put simply: this is a drive engineered to do a lot of things well, which is exactly why it ended up in so many different industries and machine types.

A Few Things Worth Checking Before You Buy

Since this is a legacy, discontinued drive, a bit of due diligence goes a long way:

• Confirm the exact part number and hardware/firmware revision against what’s currently installed — S600 series drives had multiple sub-variants, and matching them correctly matters.
• Ask whether the unit has been tested and verified functional before it ships.
• Check what feedback type your motor uses (resolver vs. encoder) and make sure the replacement drive is configured to match.
• If your system relies on a specific fieldbus module (PROFIBUS, DeviceNet, etc.), confirm the expansion card you need is included or available separately.
• As with any used industrial electronics, plan for a proper bench test before putting it back into production.

Sourcing the SERVOSTAR 640 Through ILM Surplus Fze

At ILM Surplus Fze, this is exactly the kind of part we deal with regularly. We source and supply used and surplus industrial automation components — servo drives, PLCs, HMIs, motion control hardware — for facilities that need to keep older, proven systems running without the cost and downtime of a full upgrade.

A few things to know about working with us:

• We’re not an authorized distributor for Kollmorgen or any other original manufacturer — we work in the surplus and used-parts market, and we’re upfront about that.
• Our strongest reach is across the UAE (Dubai), Saudi Arabia, and Pakistan, where we support customers with faster local turnaround. That said, we ship worldwide, so if you’re located elsewhere and need a SERVOSTAR 640, we can still help.
• Stock on legacy drives like this changes constantly since it isn’t manufacturer-replenished — the nature of the surplus market. The best move is to reach out directly so we can confirm current availability and give you an accurate quote.

If a SERVOSTAR 640 has gone down on your line and you need a dependable replacement without the wait, get in touch with our team. We’ll help you confirm the right variant, check stock, and get your machine back up and running.

Contact ILM Surplus Fze today for a quote on the SERVOSTAR 640 (S64000-NA) or any other Kollmorgen and industrial automation parts you’re looking for.