Fault limits tab
This tab serves as:
- Set fault triggering levels and tolerances
Parameters
Drive fault limits
| Short GUI name | GUI name | Description | How to use |
|---|---|---|---|
| FOC | Over current tolerance | Set sensitivity of over current faults | This variable defines how much over current (measured motor phase current above the peak current limit (Machine/MMC) drive allows before entering into fault state. The Minimum setting has lowest threshold and gives fault easier, Maximum tolerates largest over current spikes before faulting.
Set this as low as possible without getting OC faults in normal use to maximally protect your equipment. If larger than Medium setting is needed, see Over current fault troubleshooting for solution to the problem. |
| FOV | Over voltage fault threshold | Maximum allowed HV DC bus voltage before entering into over voltage fault. Also defines at which voltage drive starts driving braking resistor to reduce bus voltage. Set FOV value at least 10% higher than nominal HV DC bus voltage (FOV=1.55*AC voltage). | Suggested value at different mains voltages:
|
| FUV | Under voltage fault threshold | Minimum allowed HV DC bus voltage before drive starts motor initialization after power-on. Also if this voltage is exceeded during active operation, drive enters into under voltage fault state. | Suggested value at different mains voltages
|
Goal deviation faults
These settings define how much motor may deviate from the setpoints or allowed operating conditions before entering in fault state.
| Short GUI name | GUI name | Description | How to use |
|---|---|---|---|
| FFT | Goal fault filter time | Set time filter for this fault group. Defines how long drive allows exceeding these conditions before entering into fault state. | Normally values between 0-0.5 seconds are safe. Higher value may pose danger to user or equipment as motor is not being stopped soon after error condition. |
| FPT | Position tracking error threshold | Defines how much position may deviate from the setpoint | The value is set as hardware units. Adjust the value and observe the right side value displaying the hardware value converted to a real world units such as revolutions/s. Make sure Machine tab settings are set-up first to get correct conversion. |
| FVT | Velocity tracking error threshold | Defines how much velocity is allowed to deviate from velocity setpoint | |
| FEV | Over speed fault | Defines the maximum allowed speed (feedback based) which the axis is allowed to operate before entering to the overspeed fault state | |
| FMO | Motion fault threshold | Defines the sensitivity to enter into motion fault. Used for detecting mechanically blocked motion and DC motor runaway (loss of feedback) | If motion fault feature needed, adjust the value experimentally by increasing it until faults don't occur in normal use. A good starting value may be motor continuous current in milliamperes/2. |
| LSF | Limit switch function | Define drive action when limit switch input is open. In current firmware version only options Do nothing, Disable torque and Fault stop are supported. | Choose preferred action when limit switches are open. Choose Do nothing if limit switches are not present, Disable torque if stopping of torque is preferred at the end of travel and Fault stop if drive should stop to an fault state if axis travel is exceeded. |
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