Maintenance:

 The Altivar 18 does not require any preventive maintenance. However, it is advised to perform the following at regular intervals:
  Check the state and tightness of connections.
  Ensure that the temperature in the area around the equipment remains at an acceptable level and that ventilation is effective (average lifetime of fans: 3 to 5 years depending on the conditions of use).
  Ensure the speed controller is free from dust.

Maintenance Assistance:

 The first fault detected is memorized and displayed on the display if the voltage is maintained: the speed controller locks itself and the fault relay trips.

Clearing the Fault:

 Remove the power supply to the speed controller.
 Find the cause of the fault in order to eliminate it.
 Reconnect the power supply: this will clear the fault if it has been corrected.
 In some cases, the equipment may automatically restart after the fault has disappeared if this function has been programmed.

Replacements and Repairs:

 For repairs and replacements on Altivar 18 speed controllers, consult your local Schneider office.

Faults Which Can Be Reset with the Automatic Restart Function, After the Cause of the Fault Has Been Corrected:

 OHF (Overload): Check the motor load, speed controller ventilation, and the environment. Wait for it to cool before restarting.
 OLF (Motor Overload): Check the setting of the motor thermal protection and check the motor load. Wait for it to cool before restarting.
 OSF (Overvoltage): Check the mains voltage and for mains interference in steady state or during acceleration.
 USF (Undervoltage): Check the voltage and the voltage parameter. Reset. Change the load resistance if weakened.
 ObF (Overvoltage on Deceleration): Increase the deceleration time, add a brake resistor if necessary, and activate the function brA if it is compatible with the application.

Faults Which Cannot Be Automatically Reset. The Cause of the Fault Must Be Corrected Before Resetting by Switching the Controller Off and Then On Again:

 OCF (Overcurrent): Having disconnected the speed controller, check the connection cables, motor isolation, and the state of the windings. Check the resistor selected for the brake.
 dbF (Braking Circuit Overload): Check the brake resistor selected, its ohmic resistance value, and ensure that the speed controller rating is suitable for the application.
 InF (Internal Fault): Check the environment (electromagnetic compatibility) and return the speed controller for servicing/repair.
 tnF (Auto-tune Error): Use L or P mode, ensure the power motor is adapted to the speed controller.
 EEF (Internal Fault): Return the speed controller for servicing/repair.

If you encounter any of these faults, follow the recommended remedies to resolve the issue. If the problem persists, contact your local Schneider Electric representative for further assistance.