OMRON 3G3SV Inverter Practical Manual

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.