A 5.5 kW ventilation fan motor is to be controlled from an LG SV110IS5-4 drive rated 11 kW, using an available 4–20 mA temperature signal. The evidence supports enabling the drive's PID function and provides an initial parameter set, but it does not identify the analog input terminals, signal-scaling parameters, temperature range, setpoint, motor nameplate values, or control direction. Confirm those items in the drive manual before energizing the fan.
Drive and Motor Compatibility
The drive is two power sizes above the 5.5 kW motor. The available guidance identifies vector control as potentially problematic with this difference and proposes scalar control as the initial approach. This is a commissioning hypothesis, not confirmation that the drive can protect or control this specific motor correctly. Enter the actual motor data in FU2-30 through FU2-37, then verify that the drive's configurable motor-current range and protection functions cover the motor nameplate.
| Item | Evidence | Required decision |
|---|---|---|
| Fan motor | 5.5 kW | Record its complete nameplate data. |
| Drive | LG SV110IS5-4, 11 kW | Confirm compatibility with the smaller motor. |
| Feedback | Available 4–20 mA analog sensor | Identify input terminals, scaling, and temperature range from the applicable documentation. |
| Control mode | Scalar control proposed; vector operation questioned | Commission scalar control first and verify stable operation. |
Evidence-Supported Parameter Set
The following values are the only documented starting points in the supplied evidence. Several parameter functions are not defined there; verify their descriptions and permissible ranges in the manual for the installed drive before applying them.
| Parameter | Starting value or action | Supported meaning |
|---|---|---|
FU2-93 |
1 |
Factory initialization |
FU2-30–FU2-37
|
Enter actual values | Configure from the real motor or installation data; individual field meanings are not supplied. |
FU2-47 |
1 |
Enable PID control |
FU2-53 |
600 s |
Function is not identified in the evidence; verify before use. |
FU2-40 |
0 |
Function is not identified in the evidence. |
FU2-22 |
Do not change initially | The source warns against changing it, but does not provide its function or safe limit. |
FU1-50 |
1 |
Function is not identified in the evidence. |
DRV-01 |
60 s |
Starting ramp setting; exact parameter description requires verification. |
DRV-02 |
180 s |
Starting ramp setting; exact parameter description requires verification. |
Commissioning Procedure
- Record the existing drive configuration, then confirm that factory initialization is acceptable because
FU2-93=1will remove the retained setup. - Initialize the drive with
FU2-93=1. - Enter the actual motor and installation values in
FU2-30throughFU2-37. Do not guess missing nameplate data. - Select the proposed scalar operating mode after identifying the correct setting in the manual.
- Apply the documented starting values:
FU2-47=1,FU2-53=600 s,FU2-40=0,FU1-50=1,DRV-01=60 s, andDRV-02=180 s. LeaveFU2-22unchanged initially. - Configure the selected analog input for the sensor's 4–20 mA signal. Establish the sensor's temperature span, PID setpoint, control direction, minimum frequency, and maximum frequency from process requirements; none is supplied by the evidence.
Functional Verification
Before coupling control to the process, verify that the displayed feedback follows the measured temperature across the required range and that an increasing temperature commands the intended change in fan speed. Test the response near the setpoint, confirm stable PID action, and verify the 60 s and 180 s ramp behavior. Also confirm motor current remains within its nameplate limit throughout the speed range. If the fan accelerates in the wrong direction, oscillates, or reaches an unsafe speed, stop commissioning and correct the input scaling, PID direction, limits, or tuning rather than changing FU2-22 without its documented function.
FAQ
Which LG iS5 parameter enables PID control?
Set FU2-47=1. The feedback input, temperature scaling, setpoint, and PID direction still require separate configuration.
Can an 11 kW SV110IS5-4 control a 5.5 kW fan motor?
The proposed setup uses that combination, but the evidence does not confirm the drive's minimum motor range or protection capability. Verify compatibility, enter the actual data in FU2-30 through FU2-37, and begin with the proposed scalar mode.
What acceleration and deceleration settings are proposed for the fan?
The supplied starting values are DRV-01=60 s and DRV-02=180 s. Verify the exact parameter definitions and test both ramps with the installed fan.
