Altivar® 58 TRX AC Drives
Fault Management Parameters
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66 09/2003
The faults which allow automatic restarti ng are:
• Input mains overvoltage • Drive controller thermal overload
• 4-20 mA speed reference loss • DC bus overvoltage
• External fault • Motor phase loss
• Serial link fault
• Motor thermal overload if thermal stat e is below 100%
• Mains voltage too low (for this fault, the function is alw ays active, even if it has not been configured).
In the case of this fault, the controller fault relay remains en ergi z ed if the function is configured, and
the speed reference and the operating direction must be maintained.
Automatic restart is often used in applications where machines or installations are operating
continuously or without supervision and which, when restarted, pose no hazard to either equip me nt o r
personnel (for example, pumps, fans, etc.).
Fault Reset Type
This function allows faults to be reset by logic inpu t (LIx), whi ch can b e re-assigne d to th is funct ion. The
starting conditions after reset are the same as those at a normal power-up.
Two types of reset are avail able: Type 1 and Type 2. In Type 1, which is often used for applicat ions where
drive controllers are difficult to access (for example, on moving parts in materials ha ndling systems ), the
following faults may be reset:
• Overvoltage • Overspeed
• External fault • Drive controlle r overheating
• Motor phase loss • DC bus overvoltage
• Loss of 4-20 mA speed reference • Serial link fault
• Motor overload if thermal state is below 100%
The mains undervoltage and mains phase loss faults will reset autom atically when the supply ret urns to
normal.
In Type 2, all faults are inhibited, i nc lud in g th ermal prote ct ion fun cti ons except motor short-circuit. This
type is used in applications involving drive controllers where restart could be vital, such as furnace
conveyors, smoke extraction fans, and machines with hardening products which need to be removed.
Output Phase Loss
The output phase loss detection can be disabled. Factory setting is enabled.
Input Phase Loss
The input phase loss detection can be disabled on three phase devices. Factory setting is enabled.
Loss of Follower
The drive controller can be configured to detect a loss of a 4–20 mA speed reference signal. If so
configured, the following responses to the loss of signal can be selected:
• Immediate fault, stop the motor
• Stop the motor without fault and restart on return of the reference signal
• Stop the motor, deenergize the fault relay, and display loss of 4–20 mA speed reference on the
keypad display
• Continue to run at last the speed without fault and follow the speed ref erence upon return of th e signal
• Continue to run, but at a configured preset speed. The adjustab le r ange for the preset speed is from
0 to the high speed setting.