Complete Guide to SV-iG5A Inverter

Frequency setting and operation instruction source (drv and Frq):

Drv (A103) determines the source of the running instruction: 0=keyboard RUN/STOP key; 1=Terminal Fx/Rx; 2=Terminal Fx/Rx and Fx is "enabled for operation", Rx is reverse selection; 3=RS485 communication.

Frq (A104) determines the frequency source: 0=keyboard numeric setting; 1=Keyboard potentiometer; 2=V1（0~10V）； 3=V1（-10~10V）； 4=I（0~20mA）； 5=V1+I superposition; 6=V1(0~10)+I； 7=RS485； 8=numerical quantity UP/DOWN; 9=Communication options.

Common error: Setting drv=1 (terminal control) but not short circuiting Fx-CM, motor does not turn; Or Frq=0 but no frequency input on the keyboard.

Acceleration and deceleration time and multi-stage settings:

ACC (A101) and DEC (A102) are used for basic acceleration and deceleration, with a unit of 0.1 seconds and a range of 0-6000 seconds.

When different acceleration and deceleration slopes are required, I34~I47 can be set as multi-stage acceleration and deceleration times of 1-7, and selected through the "multi-stage acceleration and deceleration low/medium/high" combination of the multifunctional input terminal.

Note: H70 determines the reference frequency for acceleration and deceleration time -0 represents the maximum frequency (F21) as the reference, 1 represents the frequency command change as the reference, and the latter is more accurate in dynamic adjustment.

V/F mode and torque boost:

F30 can choose linear, square, or user-defined V/F curves. For fan and pump loads, a square curve can save energy. For heavy load startup, it is necessary to manually set F28 (forward torque boost, 0-15%) and F29 (reverse boost). If F27=1 (automatic torque boost), it will automatically adjust according to the load, but the response may lag.

Sensorless vector control (H40=3):

After activation, the motor parameters need to be self-tuning (H41=1), and the system will automatically measure the stator resistance (H42) and leakage inductance (H44). The maximum frequency of this mode can be extended to 300Hz, but attention should be paid to the mechanical strength of the motor. Simultaneously, it is necessary to set the speed loop P/I gain (H45/H46) and torque limit (H47). Practice has shown that the load-carrying capacity of this mode is better than V/F at low frequencies (<5Hz).

PID control (H49=1):

Used for constant pressure water supply, tension control, etc. The feedback source is selected through H50 (I or V1), and H58 selects the unit (Hz or%). The P/I/D parameters H51~H53 need to be debugged according to different situations: generally, H51 is set to a small value (such as 100) and gradually increased until the system no longer oscillates; H52 points usually take 1-2 seconds; Differential H53 is used in fast response scenarios and is prone to introducing noise. In addition, H54=1 is a process PID, which can directly output frequency based on feedback and given difference. The sleep/wake function (H61~H63) can prevent the water pump from running idle at low frequencies.

Selection of Braking Resistors and Dynamic Braking

The SV-iG5A internal braking unit is already built-in in models below 22kW, but the braking resistor needs to be externally connected. The manual provides resistance values and power selection tables for 100% and 150% braking torque (see section 7.5 of the original text). For example:

200V 0.75kW: 200 Ω/100W for 100% braking, 150 Ω/150W for 150% braking.

200V 22kW: 8 Ω/2800W for 100% braking, 6 Ω/3600W for 150% braking.

The ED% of the resistor is generally 5%, and the continuous braking time does not exceed 15 seconds. During installation, the resistor must be connected to terminals B1 and B2. It is absolutely forbidden to short-circuit B1-B2, otherwise it will damage the internal brake pipe.

H75 and H76 are used to limit the utilization rate of the braking resistor: when H75=1, the proportion of braking action time to the entire operating cycle is limited by H76 to prevent the resistor from overheating. In practical applications, if frequent deceleration occurs, it is recommended to increase the resistance power level or use an external braking unit.

In depth investigation of typical fault codes

When the keyboard displays a fault code, the vast majority of cases are not due to hardware damage to the inverter, but rather external parameter or wiring issues. The following are the high-frequency faults that occur on site and the corresponding handling paths.

OC/OC2 (overcurrent)

Trigger condition: The output current exceeds the rated value by about 200%.

Common reasons:

The acceleration and deceleration time is too short, and the motor inertia is large. Solution: Add ACC/DEC.

The insulation damage of the motor cable causes a short circuit between phases or relative to ground. Solution: Shake test insulation and replace cable.

The mechanical brake is not opened or the load is stuck. Solution: Check the brake control circuit.

The output side contactor shakes during operation. Solution: Check the auxiliary contacts.

Attention: OC2 specifically refers to IGBT through short circuit, which is usually caused by module damage or drive circuit failure, and the frequency converter needs to be replaced.