Overview and Where the GS30 Fits
The DURApulse GS30 series is a high-performance AC drive family that pushes past general-purpose V/Hz duty into sensorless vector, closed-loop flux vector, and torque control. For an engineer specifying a drive, the practical consequence is that a single hardware platform covers three distinct application classes that previously forced a product change: simple fan/pump duty, speed-regulated machine axes requiring encoder feedback, and tension/torque-regulated web or winder applications.
Three feature groups drive most selection decisions on this platform:
- Control mode coverage — sensorless vector, closed-loop flux vector (encoder feedback), and torque control modes.
- Application-layer functions built into the drive — internal tension control loop, PID control, and built-in PLC functionality, which can remove an external controller from small machines entirely.
- Motor parameter set flexibility — up to four independent induction motor (IM) parameter sets, or control of a single AC permanent magnet (PM) motor.
Safe Torque Off (STO) is integrated, and the drives carry CE, TUV, UL, and cUL approvals. All GS30 drives and accessories are covered by a two-year warranty.
Control Modes and Motor Support
| Mode | Feedback required | Typical use | Commissioning notes |
|---|---|---|---|
| Sensorless vector | None (model-based) | Conveyors, mixers, general constant-torque machinery | Requires accurate motor nameplate entry and an auto-tune to identify motor parameters |
| Closed-loop flux vector | Encoder / pulse feedback | Machine axes needing tight speed regulation and low-speed torque | Verify encoder counts-per-revolution, direction agreement with motor rotation, and signal type before enabling |
| Torque control | Application dependent | Winders, unwinders, load sharing | Always configure a speed clamp/limit so the shaft cannot run away when material breaks or web tension is lost |
| Internal tension control loop | Application dependent | Web handling, coil/roll processing | Determines whether an external tension controller or PLC loop is still required |
Multiple motor parameter sets
The GS30 supports up to four independent induction motor parameter sets. This matters in three concrete cases:
- Motor-changeover machines — one drive feeding different motors through contactors (never switch contactors while the drive is producing output; interlock the run command).
- Dual-nameplate motors — separate parameter sets for high-speed and low-speed windings or for 50/60 Hz operating profiles.
- Product recipe changes — different tune-up, current limit, and acceleration profiles selected per product being run.
PM motor control is limited to a single AC permanent magnet motor. If your machine requires switching between multiple PM motors on one drive, that is outside the stated capability and requires one drive per motor.
Horsepower Ranges by Input Configuration
The GS30 range spans single-phase and three-phase supplies. Confirm the exact model catalog number against the input voltage and phase actually present at the panel before ordering — a single-phase 230 VAC installation caps out well below the three-phase range.
| Input supply | Maximum rating in the series | Design implication |
|---|---|---|
| 230 VAC, single-phase | 3 hp | Ceiling for single-phase feeds; above this, a three-phase supply or a phase converter is mandatory |
| 230 VAC, three-phase | 50 hp | Common for retrofits into existing 240 V delta plants |
| 460 VAC, three-phase | 100 hp | Preferred for larger loads — lower line current, smaller conductors and upstream devices |
Sizing the supply and feeder
Drive selection is by motor horsepower and full-load current, not by hp alone. Use the motor nameplate FLA and compare it to the drive's rated output current; select the drive whose rated output current is equal to or greater than motor FLA at the application duty. To convert a known line current to apparent power for transformer or feeder sizing:
Three-phase: kVA = sqrt(3) x V_LL x I_line / 1000
Single-phase: kVA = V x I / 1000Example decision path for a 230 VAC feed drawing 40 A:
- If 40 A is three-phase line current: kVA = 1.732 x 230 x 40 / 1000 = 15.9 kVA.
- If 40 A is single-phase current: kVA = 230 x 40 / 1000 = 9.2 kVA.
Do not assume the phase topology from an ammeter reading alone. Confirm it on the one-line diagram, then size upstream protection per the drive's published input current and the applicable installation code. Verify short-circuit current rating (SCCR) and branch-circuit protection requirements against the drive documentation for the specific frame you select.
Communications and Integration Options
Network connectivity is handled through optional communication cards:
| Option | Ports | When to specify |
|---|---|---|
| EtherCAT card | Per card specification | High-update-rate motion or coordinated multi-drive systems on an EtherCAT master |
| EtherNet/IP card, single port | 1 | Star topology to a managed switch; simplest failure domain |
| EtherNet/IP card, dual port | 2 | Device-level ring or daisy-chain to reduce switch port count and panel cabling |
Built-in PLC and PID
Built-in PLC functionality plus PID control lets the drive close a process loop locally — pressure, flow, level, or tension — without a network round trip. Keep two things in mind when using it:
- Logic that lives inside the drive is not visible in your plant PLC program. Document it and back up the drive configuration file with the machine's source code archive.
- Local PID and a supervisory PLC loop must not both write the same setpoint or output. Define one owner of the frequency/torque reference and interlock the other path.
Panel Layout, Zero-Stack Mounting, and STO
The GS30's compact design permits zero-stack (side-by-side, no gap) installation, which materially reduces the width of a multi-drive panel. Zero-stack is a mechanical allowance, not a thermal free pass:
- Verify the ambient temperature and any derating condition tied to zero-stack mounting for the specific frame size in the drive documentation.
- Preserve the specified clearance above and below each drive for vertical airflow — zero-stack removes side clearance only.
- Total the watts dissipated by all drives plus other panel heat sources, then size the enclosure cooling or air conditioner for the worst-case ambient. Drives at the downstream end of a shared airflow path run hottest.
- Route motor cables away from control and encoder wiring. Use shielded motor cable with the shield bonded 360 degrees at both ends to keep common-mode current out of the encoder and network conductors.
Applying STO
STO is a drive-integrated function that removes torque-producing energy without dropping the main contactor. Practical rules:
- STO is not an electrical isolation method. Lock out and tag out the upstream disconnect for any maintenance where contact with power conductors is possible.
- Wire the STO inputs from a rated safety relay or safety controller, and verify the achievable safety level for the complete function against the drive's safety documentation before certifying the machine.
- STO removes torque; a load with inertia or an overhauling axis will coast. If the application needs controlled stopping or a held load, add a mechanical brake and the appropriate stop function.
Commissioning Checklist
- Confirm supply voltage and phase against the drive nameplate before applying power.
- Enter the motor nameplate data — voltage, FLA, base frequency, rated RPM, power factor, and pole count — into the active parameter set.
- Run auto-tune with the motor coupling condition specified for the tuning method used (static versus rotating tune).
- Set acceleration and deceleration times, current limit, and minimum/maximum frequency to the mechanical limits of the machine.
- For closed-loop flux vector, confirm encoder feedback polarity: jog in the forward direction and verify the feedback value increases before enabling the closed loop.
- For torque or tension modes, set the speed clamp before the first web run.
- If a comm card is fitted, set the IP address (EtherNet/IP) or station configuration (EtherCAT), then verify cyclic data exchange and the comm-loss fault action.
- Test STO with the drive running: assert the safety input and confirm the drive removes output and reports the expected STO state.
- Export and archive the parameter file, and record the firmware revision alongside it.
FAQ
What is the maximum horsepower for a GS30 on single-phase 230 VAC?
3 hp. Above that you need a three-phase supply: 230 VAC three-phase reaches 50 hp and 460 VAC three-phase reaches 100 hp in the GS30 series.
Can one GS30 drive control multiple motors?
It supports up to four independent induction motor parameter sets for switched-motor or recipe-based applications, but only a single AC permanent magnet motor. Never switch output contactors while the drive is producing output — interlock the run command with the changeover sequence.
Do I need an encoder for GS30 vector control?
Only for closed-loop flux vector control. Sensorless vector control operates from motor model data and a completed auto-tune with no feedback device, and is adequate for most constant-torque and variable-torque loads.
Which GS30 EtherNet/IP card should I use, single-port or dual-port?
Use the dual-port card to daisy-chain or ring drives and cut switch port count; use single-port cards in a star topology when individual drives may be de-energized for service without dropping the rest of the network.
Does zero-stack mounting require thermal derating?
Zero-stack removes side clearance only — vertical clearance above and below each drive still applies. Check the documentation for the specific frame size and ambient temperature, and size enclosure cooling from the summed watts loss of all drives in the panel.