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)

The digital operator is an optional accessory that can be connected to the frequency converter through a dedicated cable (1 m or 3 m) and supports handheld operation or panel embedded installation. Its core functions include:

DRIVE mode: Run operation (RUN, STOP, JOG, FWD/REV keys), which can change the frequency in real time.

PRGM mode: parameter reading and modification. Switch the display group (frequency command, output frequency, output current, fault record) through the DsPL key.

Monitoring function: Display output frequency, output current, and operating status.

Fault display: When a fault occurs, display a code (such as OC, OV) and store the latest fault (constant No.48).

Parameter access hierarchy:

Constant No.00 (password/function group selection):

=0: Read only the first set of functions (No.0~No.19)

=1: Read and write the first group

=2: Read and write the first and second groups (No.0~No.29)

=3: Read and write the first, second, and third groups (No.0~No.59)

=6: Clear fault records

=8: Parameter initialization (factory values)

=9: 3-wire sequential initialization

Typical operation example: Change the acceleration time (No.9) from 10 seconds to 5 seconds:

Press the DRIVE key to switch to PRGM mode.

Press the DsPL key until "No.00" is displayed.

Press the up button to adjust to No.09, and press the READ button.

Use the up/down keys to change 10.0 to 5.0, and press the WHITE key.

Displaying 'END' indicates successful writing.

Press the DRIVE key to return to the running mode.

Notes:

Some constants (such as frequency commands) can be changed during operation, but most parameters need to be modified during shutdown.

If the set value exceeds the range or violates constraints (such as No.32 and No.33 not being set in descending order), the set value will flash for 3 seconds and return to its original value.

Chapter 4: Core Parameter Optimization - Making the Motor Work in the Best State

4.1 V/f characteristic settings (No.2~No.8)

The V/f curve determines the relationship between output voltage and frequency. The factory setting is 60 Hz saturation type, suitable for 60 Hz standard motors. Customizable:

No.2 maximum frequency (50~400 Hz)

No.3 maximum voltage (0~255 V)

No.4 fundamental frequency (usually set as the rated frequency of the motor)

No.5 intermediate frequency, No.6 intermediate voltage

No.7 minimum output frequency, No.8 minimum voltage

Constraint conditions: No.2 ≥ No.4>No.5 ≥ No.7. Violating constraints will result in the rejection of set values.

4.2 Acceleration and deceleration time (No.9~No.12)

No.9 acceleration time 1, No.10 deceleration time 1; No.11 and No.12 are the second acceleration and deceleration times (which can be switched through terminal 8).

Set the range of 0.0~600.0 seconds, indicating the time required to accelerate from 0 Hz to the maximum frequency (No.2).

The actual addition and subtraction time to any frequency is calculated proportionally.

4.3 Multi speed and Jogging (No.13~No.17, No.41~No.44)

By combining external terminals 5, 6, 7, and 8, a maximum of 9 speed segments can be achieved. The speed frequencies of each section are set from No.13 to No.17 and No.41 to No.44, respectively. The jog frequency is set by No.17, and the jog command can be triggered by terminal 7 or the operator JOG key.

4.4 Frequency command gain/bias (No.22, No.23)

When the simulated output frequency (0~10V or 4~20mA) is not linear with the desired output frequency, it can be adjusted:

No.22 Gain: The multiplier of the output frequency relative to the maximum frequency when the frequency command is 10V (or 20mA) (0.01~2.00, factory 1.00)

No.23 bias: The offset of the output frequency at 0V (or 4mA) relative to the maximum frequency (-1.00~1.00, factory 0.00)

For example, 0V is required to correspond to 6 Hz (10%), and 8V is required to correspond to 60 Hz (100%). If the maximum frequency is set to 60 Hz, then bias=6/60=0.10, gain=60/60/(8/10)=1.25.

4.5 Torque Boosting and Automatic Torque Compensation

The voltage increase at low speed (determined by the minimum voltage No.8 of V/f) can compensate for the stator resistance drop. However, excessive lifting can cause the motor to overheat.

Full range automatic torque compensation (No.29): automatically adjusts the V/f ratio according to the load torque, with a factory value of 1.0. When the motor capacity is smaller than the frequency converter capacity and high starting torque is required, it can be appropriately increased (up to 3.0). Usually no adjustments are needed.

4.6 DC Braking (No.26~No.28)

No.26 DC braking current (0~110% rated current of frequency converter)

No.27 DC braking time during shutdown (0.0~5.0 seconds, factory 0.5 seconds)

No.28 DC braking time during startup (0.0~5.0 seconds, factory 0.0 seconds)

Used for precise positioning before parking or starting. The larger the braking current, the stronger the braking torque, but the motor also heats up more.

4.7 Electronic thermal overload protection (No.18, No.19)

No.18 Choose motor type: standard motor (0) or constant torque motor (1), or disable protection (set as x1).

The rated current of motor No.19 (unit: 0.1 A) must be set according to the motor nameplate, otherwise the protection will fail or malfunction.

When multiple motors are running in parallel, electronic thermal overload cannot protect a single motor, and an external heating relay is required.

4.8 Carrier frequency (No.40)

1~6 can be set, corresponding to 2.5 kHz to 15 kHz. The higher the carrier frequency, the lower the motor noise, but the leakage current and RFI noise of the frequency converter increase, and it needs to be downgraded for use (when set to 5 or 6, the continuous output current needs to be reduced). Factory 4 (10 kHz).

4.9 Speed search function (No.54~No.56)

Used for non impact restart when the motor is rotating (such as after a momentary power outage or during the inertia rotation of the fan).

Activate through the multifunctional terminal (No.32/33 set to 6 or 7).

No.54 speed search demagnetization current level (0-200%, factory 150%)

No.55 minimum base blocking time (0.0~5.0 seconds, factory 0.5 seconds)

V/f ratio during No.56 speed search (0~100%, factory 100%)

4.10 Instantaneous power outage continues operation (No.46)

The first digit is 0: If an instantaneous power outage is detected, the UV fault will immediately trip and the machine will shut down.

If the power outage time is within the allowable range (about 1 second for power outages below 0.75 kW and about 2 seconds for power outages above 1.5 kW), it will automatically resume operation after restoration.

For production lines that do not allow downtime, this function should be enabled and coordinated with speed search.

Chapter 5: Deep Analysis and Handling of Fault Codes

3G3SV has comprehensive protection functions, with output stopping in case of faults, fault relay action, and digital display showing codes. The following are common faults and troubleshooting paths.

Display the name of the fault, common causes, and handling measures

OC overcurrent (≥ 200% rated) output short circuit, rapid acceleration and deceleration, excessive load GD ², motor stalling, motor rotating during startup, check output insulation; Extend acceleration and deceleration time; Enable speed search; Reduce load

GF grounding fault motor or cable short circuit to ground, shake test insulation resistance; Check for moisture or carbonization inside the junction box

OV overvoltage (DC bus>410V) results in too short deceleration time and excessive load regeneration energy (such as crane descent), which prolongs deceleration time; Install brake resistor (3G3IV-PERF150WJ)

UV undervoltage input voltage too low, phase loss, instantaneous power outage, electromagnetic contactor fault check power supply voltage and wiring; Set No.46 instantaneous power outage to continue operation

OH radiator overheating environment temperature>50 ℃, fan stalling, dust accumulation on heat sink cleaning heat sink; Replace the cooling fan; Reduce the carrier frequency

OL1 motor overload, excessive motor load, long-term low-speed overload operation, improper V/f setting to reduce load; Adjust V/f; Check the rated current setting of the motor

Increase the capacity of the OL2 frequency converter when the overload load exceeds 150% of the rated load for 1 minute; Extend acceleration and deceleration time

OL3 torque detection for mechanical faults, sudden load increase inspection for mechanical jamming; Adjusted torque detection level (No.38)

EF external fault terminal 3 input signal (normally open/normally closed depending on No.20 setting) check external emergency stop or protection circuit

CPF-00/01/04/05/07 Control circuit failure EEPROM error, A/D converter failure, thermistor failure Power outage retry; If it still exists, replace the frequency converter

No display but no output. The main circuit fuse is blown and the IGBT is short circuited. Replace the frequency converter (cannot be repaired on site)

Alarm (non self locking, flashing display):

EF flashing: Both forward and reverse commands are closed for more than 500 ms. Check the PLC program or wiring.

BB flashing: The external base blocking signal is valid (the multifunctional terminal is set to 4 or 5 and closed). Automatically resume after unblocking.

UV flicker: Main circuit undervoltage (shutdown state). Check the power supply.

Fault reset method:

Short circuit terminals 4-9 (reset signal) for at least 50 ms.

Press the RESET button on the numeric operator (if connected).

Power on again after cutting off the power.

Automatic reset/restart (No.47): can be set 0-10 times. When OC, OV, OH, GF (single-phase) occur, the frequency converter automatically attempts to reset and restart. If there is no fault for 10 consecutive minutes, the counter will automatically reset to zero. Attention: Automatic reset may pose safety risks, please use with caution.

Chapter 6: Maintenance and Preventive Measures

6.1 Regular inspection items

Handling of inspection content for inspection parts

External terminal screw loosening torque 0.5~0.6 N · m locking

Abnormal noise and vibration of the cooling fan; Accumulated operation>20000 hours, replace the fan (model 3G3IV-PJVOP100 needs to be consulted)

Use dry compressed air (4-6 kg/cm ²) to blow away dust and blockage on the heat sink

Cleaning of conductive dust and oil mist on printed circuit boards; If unable to clear, replace the frequency converter

Power component dust blowing

Smooth capacitor discoloration, leakage, odor replacement capacitor or frequency converter

6.2 Daily Maintenance

Keep the inside of the frequency converter dry and clean.

Prohibition of voltage withstand testing (internal semiconductors are prone to breakdown).

When stored for a long time, power on every 6 months to restore the performance of the electrolytic capacitor.

6.3 Precautions for using brake resistors

External braking resistor (3G3IV-PERF150WJ) can significantly increase deceleration braking torque (up to 150%). The wiring terminals are B1 and B2. Overload relay protection resistor must be configured, and the power supply side must be cut off when the resistor overheats. When using a braking resistor, the fourth digit of No.20 should be set to 1 (to disable stall prevention during deceleration), otherwise the braking effect is limited.

6.4 Common Error Handling

Motor not turning: Check the power supply voltage (if the CHARGE light is on); Check for voltage at the output terminals; Check if the FWD/REV signal is closed; Check if the frequency command is non-zero; Check the operation mode selection (No.1).

Unable to adjust speed: Check the frequency given circuit wiring; Check if the analog input type (voltage/current) matches No.22/23; Check the upper limit frequency No.24 setting.

Unstable speed: Check if the load fluctuates violently; Increase the capacity of the frequency converter or motor; Check the mechanical transmission clearance.

Chapter 7: Function Expansion and External Component Selection

7.1 Radio noise filter

3G3IV-PHF/3G3IV-PLF: Installed on the input side to suppress conducted and radiated interference.

7.2 Isolator K3FK

Isolate analog input/output signals to reduce the impact of induced noise on analog quantities.

7.3 Selection of Surge Absorber

For 200~230 V large contactor coils: DCR2-50A22E (0.5 μ F+20 Ω)

For OMRON LY/MM relay: DCR2-10A25C (0.1 μ F+100 Ω)

For 400~460 V systems: DCR2-50D100B (0.5 μ F+220 Ω, withstand voltage 1000 VDC)

7.4 Selection of Grounding Fault Circuit Breakers

If a leakage protector is required, a type that is insensitive to high frequencies should be selected, with an operating current of ≥ 200 mA and an operating time of ≥ 0.1 seconds to prevent false tripping caused by leakage current of the frequency converter.