Looking for the T3D servo drive manual, a wiring diagram, or trying to clear an alarm code? You are in the right place - this page collects everything our customers ask us about most:
📄 Official manuals in EN / RU / PT • 🔧 Which T3D model do you have? • ⚡ 5 checks that solve most alarms
T3D Servo Drive Manuals, Downloads and Troubleshooting Guide
The T3D is our economical absolute encoder servo drive, designed to run with HENGLI servo motors in the 0.1–1.5 kW range. It has a 17-bit absolute encoder interface, supports position, speed and torque control modes, and communicates over RS-485 (Modbus). Not sure whether your drive is a T3D? Check the model label on the front panel - it will read HL-T3D-L15A or HL-T3D-L20A. See the absolute value servo driver page for the full product description.
1. T3D User Manuals & Downloads
All manuals below are the official versions we ship with the drives. Each covers wiring, panel operation, parameter settings, alarm codes and motor matching.
| Document | Language | Download |
|---|---|---|
| T3D Full Manual V2.3 | English | Download PDF |
| T3D Instruction Manual | Russian | Download PDF |
| T3D Instruction Manual | Portuguese | Download PDF |
| T3DF Series Manual | English | Download PDF |
| Modbus Communication Description | English | Download PDF |
| T3DF Boot Settings | English | Download PDF |
All HENGLI product manuals are also collected on our downloads page.
2. Which T3D Model Do You Have?
Quick reference for the two standard T3D models. Full parameter details are in the manual (Chapter 1).
| Item | HL-T3D-L15A | HL-T3D-L20A |
|---|---|---|
| Input power | Single-phase / Three-phase 220VAC | Single-phase / Three-phase 220VAC |
| Rated output current | 7A | 10A |
| Matching servo motor | 0.1–0.75 kW | 0.75–1.5 kW |
| Encoder interface | 17-bit absolute | 17-bit absolute |
| Speed frequency response | ≥1.6 kHz | ≥1.6 kHz |
| Control modes | Position / Speed / Torque | Position / Speed / Torque |
| Communication | RS-485 Modbus, 4 DI / 4 DO | RS-485 Modbus, 4 DI / 4 DO |
| Built-in braking resistor | Yes | Yes |
3. RS-485 Communication: Wiring Checks That Solve Most "No Communication" Cases
The T3D talks to the controller over RS-485 (Modbus), and most "drive does not communicate" calls come down to wiring rather than the drive itself. Three checks cover the majority of field cases:
Check 1 - A/B polarity. Swap the A and B wires at one end and test again. Polarity conventions differ between controller brands, and a reversed pair is the most common cause of a silent bus.
Check 2 - Termination. On a bus with more than two nodes, or with cable runs over a few meters, add a 120 Ω termination resistor at each end of the RS-485 line. Without it, reflections can make communication intermittent or fail completely.
Check 3 - Address and baud rate. The drive's slave address and baud rate must match the controller's settings. The T3D defaults are listed in the Modbus Communication Description PDF above - if you changed either value during setup, verify both ends are on the same setting.
For a quick single-drive test with a PC adapter: connect A and B, set the adapter to the T3D's baud rate, and try reading one register. No response? Check polarity first - it is the fix in most field cases. Full register map and protocol details are in the Modbus Communication Description PDF.
4. Five Checks That Solve Most T3D Alarms
These are the checks we run through on the phone almost every week. They do not replace the alarm list in the manual (Chapter 6), but they solve the majority of support calls before anyone needs to open a parameter table.
Check 1 - Is the power really there?
It sounds too simple, but a large share of "drive won't start" calls turn out to be a missing phase, a tripped breaker, or an emergency stop still pressed. Confirm all three supply phases are present at the input terminals, then check the control power indicator on the front panel.
Check 2 - Restore factory defaults before re-tuning
If the drive was working and then started faulting after someone changed parameters, do not guess which parameter is wrong. Record any settings you need, then restore the factory default values using the panel procedure in Chapter 3.7 of the manual. Around half of "strange behaviour" cases come back to normal after a clean restore and re-entering just the motor parameters.
Check 3 - Clear the alarm properly
An active alarm will not clear just by cycling power in every case. The correct clearing method is in Chapter 6.2 of the manual. If an alarm returns immediately after clearing, it is not a display problem - the fault condition is still present, so go back to the cause rather than clearing it repeatedly.
Check 4 - Encoder battery voltage
If your machine uses an absolute encoder, the position is kept by battery power. A low battery shows up as an encoder alarm and the machine forgets its home position. The battery replacement procedure, including how to re-home the axis afterwards, is in Chapter 6.3. We recommend replacing the battery at least every two years in daily production use.
Check 5 - Test with keypad JOG before blaming the drive
The fastest way to tell a drive problem from a wiring or motor problem is a keypad speed trial run (Fn-20 in the manual). If the motor turns smoothly in JOG mode, the drive is fine and the issue is in the command signal or the wiring between the controller and the drive.
5. Related Products
6. Still stuck?
If the checks above do not solve it, send us the alarm code and the model number printed on the drive label - we usually reply with a likely cause the same working day.
Send Inquiry admin@hengli-hltnc.com
For new machines, we also supply matched servo motor + drive kits with parameters pre-set at the factory.
