Moog DS2100 User Manual Page 214

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DS2100 User's Manual SECTION 5: DS2100 FUNCTIONAL OVERVIEW
PAGE 5-66
5.12.3 Drive Fault Reaction
The DS2100 distinguishes between two types of faults:-
Fatal Faults are those faults with which the DS2100 cannot continue to control the motor. The DS2100's
reaction to a fatal fault is to immediately disable the switching of the power amplifier. For example, if resolver
position sensing is lost, the motor cannot be commutated. The ability to control the motor output torque is
therefore lost and the DS2100 immediately disables high power from the motor.
Non-Fatal Faults are those faults which will likely lead to equipment failure or hazards to personnel, but the
DS2100 is still capable of controlling the motor output torque. For example, motor over-temperature is treated
as a non-fatal fault, because the DS2100 can perform a controlled deceleration of the motor. Once the motor
stops rotating, the drive can apply the brake and disable the drive.
5.12.3.1 Fatal Fault
If the drive detects a fatal fault, it immediately disables the power stage of the drive. If the drive is set to internal
brake control, brake_control_fault (index 0x6510, subindex 19) = 1 (default setting), the drive will also apply the
brake immediately. If it is set to 0, then the drive will disable the power stage but application of the brake is left to
the user. Typically, the user would in this case, control the brake with a digital input.
Fault Type Drive Reaction External Brake control Internal Brake control
Fatal Immediate Disable Brake not applied Brake Applied
5.12.3.2 Non-Fatal Fault
If the drive detects a non-fatal fault, its reaction depends on a number of parameters. The action of the drive is
detailed below. On detection of a non-fatal fault, the drive immediately decelerates the drive to zero speed at the
drive deceleration limit, deceleration_limit_-_fault
(index 0x6510 subindex 26). Once the velocity falls below the
level set in parameter fault_reaction_velocity (index 0x2420 subindex 6), the brake is applied. The drive then
disables the power stage after the time set in parameter brake_bridge_timeout (index 0x6510 subindex 1) has
elapsed. If the drive does not decelerate to a speed below fault_reaction_velocity within the time set by parameter
ramp_down_timeout (index 0x6510, subindex 9), the drive will disable anyway and apply the brake .
In each of the cases outlined above, the brake will only be applied if it is under internal control, brake_fault_control
set to 1. As with the fatal fault detailed above, if this parameter is set to 0, then it is up to the user to manage the
application and removal of the brake in fault conditions.
Fault Type Drive Reaction External Brake control Internal Brake control
Non-Fatal Controlled motor
deceleration & disable
Brake not applied Brake Applied
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