Hard Faults

A Hard Fault is the highest priority fault which indicates a condition in which the 1395 has detected an internal malfunction and has determined that operation can no longer continue. This type of fault indicates that a major internal component or system has malfunctioned and that control of the drive functions may be lost. The response of the drive to a Hard Fault is a coast stop or whenever possible, a controlled motor stop.

A rotating motor will stop according to the Torque Mode commanded. The following is an example of the action that will occur based on the value of Parameter 625 “Torque Mode”

1. If Parameter 625 = 0 (Zero Torque) the drive will immediately phase back the armature bridge and open the DC contactor.
2. If Parameter 625 = 1 (Velocity Regulate) the Drive will ramp the motor velocity to zero and then open the contactor.
3. If Parameter 625 = 2 (External Torque Regulate) the Drive will immediately phase back the armature bridge and open the DC contactor.
4. If Parameter 625 = 3 (Min Select) the Drive will immediately phase back the armature bridge and open the DC contactor.
5. If Parameter 625 = 4 (Max Select) the Drive will immediately phase back the armature bridge and open the DC contactor.
6. If Parameter 625 = 5 (Load Response) the Drive will immediately phase back the armature bridge and open the DC contactor.
When a Hard Fault has occurred, fault recovery can only be accomplished by initiating a system RESET or cycling AC line power. Examples of Hard
Faults include:
Handshake Fault – A fault between processors that indicate communication or functionality was lost by one, or both processors.
Internal Memory Fault – A fault detected by a processor that indicates a component malfunction.