OMRON 3G3SV Inverter Practical Manual

OMRON 3G3SV Inverter: A Comprehensive Technical Guide from Parameter Setting to Troubleshooting

In the field of industrial automation drive, small, low-noise, fully digital frequency converters are the core components for controlling motor speed and torque. The OMRON SYSDRIVE 3G3SV series (hereinafter referred to as 3G3SV) is widely used in small machinery, conveyor belts, pumps, and fan loads ranging from 0.2 kW to 3.7 kW due to its book like compact design, rich protection functions, and flexible I/O configuration. This article is based on the original factory operation manual and provides a complete technical manual for on-site engineers and equipment maintenance personnel, covering hardware installation, digital operator operation, key parameter optimization, fault diagnosis, and preventive maintenance.

Chapter 1: Product Overview and Acceptance Inspection

The 3G3SV series is divided into three-phase input models (3G3SV-B2 □□ - E) and single-phase input models (3G3SV-BB □□ - E). The number in the model indicates the maximum applicable motor power, for example, B2002 corresponds to 0.2 kW, B2037 corresponds to 3.7 kW. The rated output current range is from 1.5 A to 17.5 A, and the overload capacity is 150% of the rated current for 1 minute.

When receiving, it is necessary to check:

Check if the model matches the order.

Check for transportation damage.

Confirm the attachment (if the digital operator is an optional item, it needs to be ordered separately).

Interpretation of nameplate data: The nameplate indicates the model, input voltage/frequency, output capacity, rated current, and serial number. Note that the input terminal labels for single-phase and three-phase models are different: the three-phase models are L1 (R), L2 (S), and L3 (T); Single phase only uses L1 and L2.

Chapter 2: Installation and Wiring - Physical Basis for Reliable Operation

2.1 Environmental Requirements

Environmental temperature: -10 ℃ to+50 ℃ (without icing).

Relative humidity: 20% to 85% (no condensation).

No corrosive gases, no metal dust, no direct sunlight, no strong vibrations or electromagnetic noise sources.

2.2 Installation Space

3G3SV adopts natural cooling or forced air cooling (high-power models). When installed vertically, sufficient ventilation gap should be left above and below (recommended ≥ 100 mm). If installed side by side, the heat dissipation spacing needs to be considered.

2.3 Main circuit wiring

Input power supply: Connect to L1, L2, L3 (three-phase) or L1, L2 (single-phase) through Molded case Circuit Breaker (MCCB). MCCB selection reference table:

Recommended frequency converter model MCCB rated current (three-phase/single-phase)

B2002/BB002 5 A / 5 A

B2004/BB004 5 A / 10 A

B2007/BB007 10 A / 20 A

B2015/BB015 20 A / 20 A

B2022/BB022 20 A / 40 A

B2037/BB037 20 A / —

Output terminals: T1 (U), T2 (V), T3 (W) are connected to the motor. The phase sequence determines the direction of motor rotation: under the forward operation command, if the motor U-V-W corresponding to T1-T2-T3 is pressed, the motor will rotate counterclockwise when viewed from the shaft extension end. When reverse is required, exchange the two phases arbitrarily.

It is strictly prohibited to connect the power cord to the output terminal, otherwise it will burn out the frequency converter.

It is strictly prohibited to connect power factor compensation capacitors or noise filters on the output side.

Grounding: The grounding terminal G (E) must be reliably grounded with a grounding resistance of ≤ 100 Ω. It is recommended to use a dedicated grounding electrode to avoid sharing the grounding wire with welding machines and large motors.

2.4 Control Circuit Wiring

The functions of the control terminal are as follows:

Sequence input (optocoupler isolation,+24 VDC, 8 mA):

Terminal 1: Forward rotation command (closed operation, disconnected stop)

Terminal 2: Reverse Run Command

Terminal 3: External fault input (normally open contact, closed fault)

Terminal 4: Fault reset (closed reset)

Terminals 5 and 6: Multi speed commands 1 and 2

Terminal 7: Jogging command

Terminal 8: Acceleration and deceleration time selection (closed to select the second acceleration and deceleration time)

Terminal 9: Sequence input common terminal

Analog input:

Terminal 10:+12V power supply (maximum 20 mA), used for external potentiometer connection

Terminal 13: Frequency command input (0~10 V~4~20 mA)

Terminal 12: Analog common terminal

Output signal:

Terminals 14 and 16: Running signal (optocoupler output,+48 V/50 mA)

Terminals 15 and 16: Consistent frequency signal

Terminals 18 and 19: Analog output (0~10 V, can be set as frequency or current)

Fault contacts: FLT-A, B, C, A-C closes and B-C opens during fault (250 VAC/1A or 30 VDC/1A)

Key precautions:

The simulated frequency signal line must use shielded twisted pair cables, with the shielding layer grounded at one end.

Control lines and power lines should be routed separately, with a minimum distance of 10 cm between them.

Relays and contactor coils need to be connected in parallel with surge absorbers (such as MARCON DCR2 series) to prevent interference.

Chapter 3: Use of Digital Operator (3G3IV-PJVOP100)