For Hope65 Series Smart AC Drive / VFD power wiring, connect the input supply to the correct input terminals: L1/L2 for compatible single-phase 220 V class models or R/S/T for compatible three-phase 380 V class models. Connect the motor only to U/V/W. Connect protective earth to the VFD and motor frame.
Use a suitable breaker/fuse on the input side, route motor cables, input power cables, and control cables separately, and connect an optional braking resistor only to the designated braking resistor terminals such as PB and (+) according to the exact model wiring diagram.
Never connect incoming mains power to U/V/W. U/V/W are VFD output terminals only. Incorrect wiring can permanently damage the drive and create serious electrical and fire hazards.
Only trained and qualified electrical personnel should install, wire, inspect, modify, or troubleshoot the Hope65 AC drive / VFD.
Before touching terminals or wiring, switch off all input power, wait at least 10 minutes, and confirm that the DC bus voltage has discharged to a safe level. Do not wire, inspect, or replace components while power is ON.
This article explains the standard power wiring method for the Slanvert Hope65 Series Smart AC Drive / VFD. It focuses on the main circuit connections that must be correct before powering the drive: input supply, motor output, protective earth, optional braking resistor, input protection, cable separation, and pre-power-on checks.
Use this article when installing a new Hope65 drive, replacing an old drive, checking a panel before commissioning, correcting wiring after a fault, or verifying whether the input power, motor cable, and protection devices are connected correctly.
01 Input SideConnect AC supply to L1/L2 or R/S/T only after confirming the exact drive voltage class. | 02 Motor SideConnect the three-phase motor only to U/V/W. Do not connect supply to output terminals. | 03 ProtectionUse breaker/fuse protection, PE grounding, cable separation, and optional accessories correctly. |
| Product Series | Slanvert Hope65 Series Smart AC Drive / VFD |
| Voltage Classes | Single-phase 220 V class and three-phase 380 V class Hope65 models |
| Wiring Scope | Main power input, VFD output to motor, PE grounding, braking resistor, MCCB/fuse, cable routing, and protection checks |
| User Level | Qualified electrical technician, panel builder, machine integrator, maintenance engineer, or automation engineer |
The Hope65 power wiring path should be treated as four separate zones: input supply, VFD main circuit, motor output, and optional braking/protection accessories.
01 AC Supply
| → | 02 Protection
| → | 03 Hope65 VFD
|
04 Motor Output
| + | 05 Braking Resistor
| Wiring Rule: Input supply goes to input terminals only. Motor goes to U/V/W only. Braking resistor goes only to designated braking terminals. PE grounding is mandatory for both VFD and motor. | |
Confirm the terminal markings on the actual product before wiring. Do not rely only on memory or old panel wiring.
| Terminal Symbol | Terminal Name | Function | Important Warning |
|---|---|---|---|
| L1 / L2 | Single-phase AC input terminals | Connection point for compatible single-phase 220 V class supply. | Use only on models designed for single-phase input. |
| R / S / T | Three-phase AC input terminals | Connection point for compatible three-phase 380 V class supply. | Check phase voltage and model voltage class before energizing. |
| U / V / W | Three-phase AC output terminals | Connect to the three-phase motor only. | Never connect mains supply to U/V/W. |
| PB / + | External braking resistor terminals | Connect optional braking resistor where required by the application. | Wrong resistor wiring can damage the VFD and create fire risk. |
| PE / Ground Symbol | Safety ground terminal | Connect to protective earth. Motor frame must also be grounded. | Do not operate without reliable grounding. |
The input side provides AC power to the VFD. Before wiring, verify the drive nameplate, model code, voltage class, and site supply voltage. Applying the wrong supply voltage can damage the drive.
| Input Type | Connect To | Before Power ON |
|---|---|---|
| Single-phase 220 V class model | L1 / L2 | Confirm the model supports single-phase input and measured voltage is within the allowed range. |
| Three-phase 380 V class model | R / S / T | Confirm phase-to-phase voltage, phase balance, breaker/fuse condition, and model voltage class. |
The VFD and input cable require short-circuit protection. A manual control circuit breaker or MCCB should be installed between the AC power source and the VFD. Fuses are used to protect the VFD and input power cable from overheating during short-circuit events.
| Device | Purpose | Installation Note |
|---|---|---|
| MCCB / Breaker | Input isolation and short-circuit protection support. | Install between AC source and VFD. Select rating based on VFD rated current and local design standards. |
| Fuse | Short-circuit protection for VFD and input cable. | Use suitable fuse rating for the specific model and installation condition. |
| Input Contactor | Cuts input power to the VFD when the system fails or requires isolation. | Avoid frequent ON/OFF cycling. Do not use input contactor as normal speed control. |
| Input Reactor / Filter | Improves input-side power quality and helps protect rectifier under certain supply conditions. | Use when required by supply condition, EMC requirement, or project specification. |
Connect the three-phase motor cable to U/V/W. These terminals carry VFD-controlled PWM output and must go only to the motor. Do not connect input supply, capacitors, power-factor correction equipment, or bypass mains wiring directly to these terminals unless a properly designed and mechanically interlocked bypass system is used.
| Motor-Side Check | Correct Condition | Problem If Wrong |
|---|---|---|
| U/V/W output wiring | Connected only to the three-phase motor terminals. | Wrong wiring can cause output fault, overcurrent, motor not running, or VFD damage. |
| Motor rotation direction | Direction matches machine requirement after low-speed test. | If direction is wrong, stop safely and interchange any two motor phases. |
| Motor cable insulation | Cable is dry, undamaged, properly terminated, and suitable for drive output. | Damaged cable can cause overcurrent, ground fault, output phase loss, or motor insulation damage. |
| Motor cable length | Cable length is within application limits, or output reactor is used where required. | Long cable can increase leakage current and cause overcurrent protection or motor insulation stress. |
Incorrect cable routing can create unstable analog speed reference, RS485 communication faults, nuisance trips, and noise in nearby devices. Keep power wiring, motor wiring, and control wiring separated.
Input Power Cable Carries AC mains supply to L1/L2 or R/S/T. Route separately from control and signal wiring. | Motor Cable Carries PWM output from U/V/W to motor. Keep away from analog, DI, AO, and RS485 wiring. | Control Cable Carries DI, AI, AO, relay, and RS485 signals. Use shielded cable where required. |
| Crossing rule: If control and power cables must cross, cross them at approximately 90 degrees. Do not run them in parallel for long distance. | ||
Proper grounding is required for electrical safety, EMC performance, leakage current handling, and stable drive operation. The VFD and motor frame must both be connected to protective earth.
| Grounding Point | Required Action | Why It Matters |
|---|---|---|
| VFD PE terminal | Connect input power ground wire directly to the VFD PE terminal. | Provides safety ground path and reduces shock hazard. |
| Motor frame ground | Connect motor cable ground wire to PE and motor body ground. | Protects motor frame and reduces fault risk. |
| Shielded motor cable | Ground shield/conductor as required at VFD and motor ends. | Improves EMC performance and reduces interference. |
A braking resistor is used when the load has high inertia, requires fast deceleration, or causes overvoltage during stopping. The Hope65 includes a built-in braking unit, but the external resistor must be selected and wired correctly for the exact model and duty.
| Check | Correct Condition | Risk If Wrong |
|---|---|---|
| Terminal connection | Connected to PB and (+) or exact braking terminals shown on the drive/manual. | Wrong wiring can damage braking circuit and create fire risk. |
| Resistance value | Matches the model’s recommended resistance range. | Too-low resistance can overload braking circuit. |
| Power rating | Matches braking duty cycle and deceleration requirement. | Underrated resistor can overheat or fail. |
| Mounting location | Installed away from flammable materials with suitable ventilation. | Braking resistors can become very hot during operation. |
Some panels use bypass circuits to run the motor directly from mains when the VFD is not used. This must be designed carefully. If input power and VFD output are connected to the motor at the same time, the VFD can be permanently damaged.
| Bypass Check | Required Condition | Reason |
|---|---|---|
| Mechanical interlock | Bypass and VFD output contactors cannot close together. | Prevents mains voltage from feeding back into VFD output. |
| Electrical interlock | Control circuit prevents simultaneous contactor operation. | Adds protection against wiring or logic error. |
| Switching sequence | Motor is isolated before switching between VFD and mains. | Avoids transient damage and unsafe operation. |
Follow this sequence during wiring. The exact terminal position may vary by model, so confirm markings on the actual drive.
Complete this checklist before applying power to the Hope65 drive.
| No. | Check | Pass Condition |
|---|---|---|
| 1 | Model and voltage class | Supply voltage matches the drive nameplate. |
| 2 | Input wiring | Input supply connected only to L1/L2 or R/S/T as applicable. |
| 3 | Motor wiring | Motor connected only to U/V/W. |
| 4 | Grounding | VFD PE and motor frame are properly grounded. |
| 5 | Breaker/fuse | Correctly selected and installed according to model and panel design. |
| 6 | Braking resistor | Connected only to designated PB/+ braking terminals, if used. |
| 7 | Cable separation | Input power, motor, control, analog, and communication cables are separated. |
| 8 | Terminal tightness | All terminals tightened to required torque. |
| 9 | Panel cleanliness | No loose wire strands, screws, cable pieces, or conductive objects remain. |
| 10 | Covers and protection | Front cover and panel protection are restored before power ON. |
| Mistake | Possible Effect | Correct Action |
|---|---|---|
| Mains supply connected to U/V/W | Permanent VFD damage, short circuit, unsafe condition. | Connect mains only to L1/L2 or R/S/T as applicable. |
| Motor connected to input terminals | Motor will not be controlled correctly; drive/panel damage possible. | Connect motor only to U/V/W. |
| No PE grounding | Shock hazard, noise issues, unstable operation, poor EMC. | Ground VFD and motor frame correctly before power ON. |
| Control cable routed with motor cable | Analog speed fluctuation, false DI signal, RS485 communication errors. | Separate cable routes and use shielding where required. |
| Wrong braking resistor terminals | Braking circuit damage, VFD damage, fire risk. | Connect resistor only to designated PB/+ braking terminals. |
| Bypass without interlock | Mains and VFD output may connect together, damaging the drive. | Use mechanical/electrical interlock in bypass circuit. |
Wiring issues may appear as faults, unstable operation, or motor not running. Use the table below to identify possible wiring-related causes.
| Symptom | Possible Wiring Cause | Check First |
|---|---|---|
| Drive display does not turn ON | No input supply, wrong terminals, loose breaker/fuse/contactor, wrong voltage class. | Measure input voltage at L1/L2 or R/S/T. |
| Motor does not run | Motor not connected to U/V/W, phase open, loose terminal, brake/load issue. | Check U/V/W wiring and motor terminal box. |
| Overcurrent fault | Output short, ground fault, wet/damaged motor cable, long cable without reactor. | Inspect motor cable, insulation, U/V/W, and motor load. |
| Output phase loss fault | One motor phase missing or loose. | Check U/V/W continuity and terminal tightness. |
| Analog speed unstable | Analog cable routed near motor cable or not shielded. | Separate analog wiring and use shielded cable. |
| RS485 communication abnormal | RS485 cable routed near power/motor cable, poor shield/grounding, A/B reversed. | Check cable route, A/B polarity, shield, and grounding. |
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Smidnya technical support can help review your drive model, supply voltage, input wiring, motor output wiring, grounding, cable routing, braking resistor, and protection device selection before commissioning.