Schneider Altivar Parameter Codes Explained
Search practical meanings of common Schneider Altivar VFD codes such as bFr, UnS, nCr, Fr1, LCC, nSt, OCF, ObF, SCF and more.
⚠️ Technician note: Altivar models do not all use the exact same parameter code. This reference focuses on common Altivar concepts and gives extra detail for ATV71/ATV61-style codes. Always confirm the final setting with the exact drive manual before commissioning.
🔎 Use the search box below as the main tool. Type a parameter code, full name, symptom, menu name, or model note. If there is no match, the page will show a clear no-result message instead of guessing.
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Use this like a VFD code dictionary. Search an exact code, parameter name, symptom, menu name, or setup task. Unknown codes show a no-match message, not a guessed result.
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| Code | Full name / display name | Practical meaning | Where value comes from | Model note |
|---|
✅ Start with motor nameplate parameters: bFr, nPr, UnS, nCr, FrS, nSP, then ItH and tUn if auto-tuning is allowed.
| Code | Full name | Meaning | What to enter | Warning |
|---|
⚠️ A very common Altivar problem is entering motor data correctly but leaving the drive in the wrong command/reference source. Check Fr1, Cd1, LCC, tCC and wiring.
| Code | Full name | Meaning | Use case | Common mistake |
|---|
| Display | Name | Meaning | First checks | Type |
|---|
ATV71 / ATV61
StylebFr nCr UnS
MenusSIM drC CtL
Best forindustrial
ATV312 / ATV320 / ATV340
Stylesimilar concepts
Codesmay differ
Best formachines
ATV212 / Process
Stylemodel specific
UseHVAC/process
Notecheck manual
⚠️ This page is intentionally a field-friendly guide, not a replacement for Schneider manuals. For exact ranges, factory settings and safety rules, use the exact manual for the installed Altivar model and firmware.
⚡ Quick Reference: Most Useful Altivar Codes
Motor Nameplate
VoltageUnS
CurrentnCr
FrequencyFrS
SpeednSP
Run From Keypad
Reference sourceFr1
Command sourceCd1
HMI commandLCC
Control menuCtL-
Common Display
ReadyrdY
Freewheel stopnSt
Current limitCLI
Auto tuningtUn
📚 Practical Setup Notes
nCr is not live currentnCr is the rated motor current from the nameplate. The live output current is monitored separately, usually as motor current/current display.
UnS follows motor connectionUnS should match the motor voltage for the actual star/delta connection, not just the incoming supply.
Wrong Fr1/Cd1 = no runThe motor data can be perfect, but the drive may still show nSt or not run if command and speed reference sources are wrong.
Auto-tune needs correct nameplate dataDo not run auto-tuning until rated voltage, current, frequency, speed and power are entered correctly.
What is this Schneider Altivar parameter code reference?
This page is a practical technician-friendly dictionary for Schneider Altivar VFD parameter codes. It explains what short codes like bFr, nCr, UnS, Fr1, LCC and nSt mean in real motor commissioning work.
Why Altivar parameters are confusing
Altivar drives often use short display codes on the keypad. The code may be a real setting, a menu group, a monitoring value, a state code, or a fault. For example, drC- is a motor control menu group, while nCr is a motor rated current value.
Important safety reminder
VFD parameter changes can start machinery unexpectedly, change motor torque, disable protection, or alter stop behavior. Use this page as a guide only. Lock out equipment, follow site procedures, and verify the exact parameter in the official manual before changing safety-related settings.
❓ Frequently Asked Questions
bFr is the standard motor frequency selection, usually 50 Hz IEC or 60 Hz NEMA. It affects related default values such as rated motor voltage, rated frequency, high speed and maximum frequency.
nCr means rated motor current. Enter the full-load current from the motor nameplate, not the current that the motor happens to be drawing at the moment.
UnS is the rated motor voltage. It should match the motor nameplate voltage for the actual connection used, such as 400 V delta or 690 V star where applicable.
Fr1 is commonly the first speed reference channel. It decides where the speed command comes from, such as keypad/HMI, analog input, terminals or communication.
LCC is commonly used for control via the local graphic display terminal/keypad on many Altivar drives. It is used when you want to run or control the drive from the keypad.
nSt means freewheel stop or no accepted run condition. Check stop inputs, run command source, terminal wiring, keypad/local mode, safety input, reference source and whether a run command is active.
Many concepts are the same, such as rated motor current, speed reference and acceleration time, but the exact codes and menu locations may differ by model and firmware.
No. This page is a practical explanation and quick lookup. Always use the exact Schneider manual for final values, adjustment ranges, safety instructions and model-specific behavior.
ObF is normally related to overbraking or excessive DC bus voltage during deceleration. Increase deceleration time, check braking resistor settings, and review high-inertia load behavior.
SCF/SCF1 is a short-circuit type fault on the motor/output side or drive power stage depending on subcode. Check motor cable, motor insulation, terminals, moisture, and output contactor wiring.
LFF usually means a 4-20 mA analog signal has been lost. Check the transmitter loop, analog input wiring, PLC output, scaling, and the reference/feedback channel assignment.