Start with the power input terminals L1, L2, and L3–mark them clearly on the device label and match them to the corresponding phases of your 380VAC supply. Verify the voltage rating on the drive’s nameplate before making connections to avoid overvoltage damage. Use shielded, stranded copper cables with a cross-section of at least 2.5 mm² for the main circuit, ensuring compliance with IEC 60204-1 standards for industrial installations. Ground the shield directly at the inverter’s PE terminal, not at the motor or elsewhere in the circuit, to minimize electromagnetic interference.
The control circuit requires precise signaling: connect digital inputs DI1-DI6 to your PLC or relay outputs using 0.75 mm² cables, keeping wire runs under 30 meters to prevent signal degradation. For analog inputs (AI1, AI2), use twisted-pair cables with a dedicated 0-10V or 4-20mA source–never combine power and signal wires in the same conduit. The drive’s internal 24VDC auxiliary power can supply digital inputs, but confirm the total current draw doesn’t exceed 200mA to avoid overheating the internal regulator.
For motor connections, terminate U, V, and W to the motor’s stator windings, ensuring correct phase sequence to prevent reverse rotation. If using a braking resistor, connect it to terminals B1 and B2, selecting a resistor with a power rating at least 1.5 times the motor’s rated power for safe dynamic braking. Always disengage the main power supply and wait 5 minutes for the DC bus capacitors to discharge before servicing the unit–failure to do so can result in lethal voltages persisting in the circuit.
Refer to page 12 of the technical manual for the default terminal assignments, but note that terminal functions can be remapped via parameters P4-01 to P4-06 for digital inputs and P4-07 to P4-10 for analog inputs. For encoder feedback, use terminals PG1-PG3 with differential signaling (RS422) to improve noise immunity–single-ended connections are vulnerable to interference in industrial environments. When troubleshooting, measure the DC bus voltage between terminals P and N; a reading of ~540V DC confirms proper rectification of the 380VAC input.
Isolate all external control signals from the drive’s power circuit using optocouplers or relays to prevent ground loops. If connecting multiple drives on the same network, use a common-mode choke on the shared power supply to reduce harmonic distortion. For installations with long motor cables (>50 meters), add output reactors (3% impedance) between the drive and motor to mitigate voltage spikes that can damage winding insulation. Always confirm the motor’s nameplate data matches the drive’s settings–mismatches in current or voltage ratings will trigger overload faults during operation.
Practical Steps for Installing the GA Series Drive: Electrical Layout
Begin by connecting the main power source to terminals R/L1, S/L2, and T/L3. Ensure the input voltage matches the drive’s rating–typically 200–240V for single-phase or 380–480V for three-phase configurations. Use copper wires sized according to the current load: 14 AWG for up to 15A, 12 AWG for 20A, and 10 AWG for 30A. Verify the circuit breaker matches the wire gauge to prevent overload.
For motor connections, link U/T1, V/T2, and W/T3 to the corresponding motor phases. Torque mode requires calibration–set the drive’s parameters to match the motor’s nameplate data (voltage, current, and frequency). If the motor includes a thermistor, wire it to the designated terminals (usually labeled TH) to enable thermal protection. Skip this step only if the motor lacks temperature sensing.
Digital inputs and outputs demand precise terminal assignments. Assign DI1 to the start/stop function, DI2 to forward/reverse control, and DI3–DI5 for auxiliary signals like fault reset or speed selection. Use a 24V DC source for logic signals, ensuring the power supply’s polarity aligns with the drive’s requirements. For analog inputs, connect a 0–10V or 4–20mA signal to AI1/AI2 for speed or torque reference, grounding the shield at one end to reduce noise.
Follow this terminal configuration for basic I/O setup:
| Terminal | Function | Recommended Wire | Notes |
|---|---|---|---|
| R/L1, S/L2, T/L3 | Power input | 10–14 AWG | Verify phase rotation |
| U/T1, V/T2, W/T3 | Motor output | Same as input | Check continuity before power-up |
| DI1–DI5 | Digital inputs | 18–22 AWG | 24V DC source required |
| AI1, AI2 | Analog inputs | Shielded twisted pair | Calibrate 0–10V/4–20mA |
| E, P24 | Ground/24V output | 14 AWG | Ground to chassis |
Grounding must adhere to local electrical codes. Connect the drive’s PE terminal to the system ground using a dedicated conductor, never daisy-chained. For installations in noisy environments, add a line reactor between the power source and drive to filter harmonics. If using a braking resistor, attach it to terminals P/+ and PR, selecting a resistor value based on the drive’s manual (typically 10–100 Ω for standard applications).
After wiring, power up the drive in test mode. Initiate a jog cycle at 10% speed to confirm rotation direction and monitor current draw. Adjust V/F patterns or vector control settings if the motor vibrates or draws excessive current. For multi-motor setups, wire each drive separately, synchronizing parameters via communication protocols (Modbus RTU or Ethernet/IP) if required. Document every connection for troubleshooting, labeling wires with heat-shrink markers or tags.
Locating Primary Input Connections on Your Frequency Converter
Begin by inspecting the left side of the control module where three main terminals–labeled R/L1, S/L2, and T/L3–are positioned for incoming three-phase or single-phase voltage. Verify the installation manual for the exact voltage rating applicable to your unit (e.g., 200–240V or 380–480V) as incorrect connections risk permanent damage to internal components.
Check the adjacent label markings for each terminal to confirm line sequence when connecting input power. R/L1 is consistently assigned to the first phase, S/L2 to the second, and T/L3 to the third. Reverse polarity or misaligned phase order can cause erratic motor rotation or overheating of the heatsink.
Examine the DC bus terminals–P (+) and N (−)–situated near the control board if your setup includes braking resistors or external capacitors. These points interface directly with the internal rectifier and should only be accessed when modifying dynamic braking configurations or troubleshooting regenerative voltage spikes.
For single-phase configurations, connect the supplied voltage across R/L1 and S/L2 while leaving T/L3 unoccupied. Ensure the jumper settings on the terminal block match the specified input voltage range; incorrect jumpers can lead to undervoltage faults or overcurrent trips.
Use a multimeter to validate continuity between each phase terminal and the corresponding fuse holder before energizing. The fuse specifications (typically 10–30A depending on motor load) are documented on the thermal rating plate adjacent to the power terminals.
- Torque adjustment potentiometer inputs (AI1, AI2) are positioned above the power section–avoid mistaking them for main supply points.
- Ground terminal (marked PE) is adjacent to T/L3; secure it to the chassis with a star washer to prevent vibration-induced corrosion.
- Control circuit terminals (12V, 24V DC) are etched on the bottom right–handle these only when integrating external control signals.
If the display shows error code E-20 after power-up, recheck the tightness of all terminal screws; thermal expansion can loosen connections over repeated duty cycles. Torque terminal screws to 0.8–1.2 Nm using a calibrated screwdriver to prevent arcing that degrades contact surfaces.
Connecting Control Signals: Start/Stop and Digital Inputs
Use terminal SC as the common reference point for all digital control lines. Connect the negative side of the power source (e.g., 24V DC supply) to this terminal to ensure stable signal grounding. Failure to do so may cause erratic behavior or false triggering of commands.
For start/stop functions, wire the external pushbutton or relay contact between S1 and SC. A closed circuit activates the drive, while an open circuit halts it. Verify the control voltage matches the expected logic level (typically 24V DC) to prevent damage to internal circuits.
Digital inputs S2–S7 accept multi-function signals–assign each based on parameter group H1-01 settings. Configure these inputs via the drive’s interface before wiring: select functions like jogging, fault reset, or speed references. Avoid mixing different voltage levels (e.g., sinking vs. sourcing) unless isolated by relays or optocouplers.
Test each input with a multimeter before operation. Measure voltage between SC and the input terminal (S1–S7)–it should toggle between 0V (active) and 24V (inactive) when triggered. Persistent leakage current (above 2mA) indicates a faulty switch or incorrect wiring.
For noise immunity, twist signal cables with their return conductors. Keep control lines at least 20cm from power cables and use shielded cable if runs exceed 5m. Terminate shields at a single point on the drive’s ground bus to prevent ground loops.
If using PLCs or HMIs, ensure outputs are rated for inductive loads. Add flyback diodes for relay coils or opt for solid-state outputs to extend component life. Never connect LEDs or indicators directly to control terminals without current-limiting resistors (1kΩ–2kΩ).