JVL MAC050 - Page 43

JVL A/S - User Manual - Integrated Servo Motors MAC050 - 4500 39
2.7 Error messages and error handling
2.7.6 Error message ’Regenerative overload’
Error message 5, 6 and 7 do not exist since bits are used for other status purposes.
2.7.7 Error message ’Position Limit Exceeded’
Message no. / Message
4 / ’Regenerative overload’
Type / Motor action Unrecoverable error / Motor is set in passive mode.
Error condition The amount of power dissipated in the motors built-in power
dump (breaking) resistor is above safe limit.
This error is tripped if the ’Regenerative load’ is >99%.
The regenerative load value can be monitored in the ’Motor
status field’.
Possible cause of this error The returned amount of energy from the motor has been too
high. This can typically happen if:
- The motor decelerate a large load inertia too fast.
- The motor is forced backwards.
- The servo filter or ’Load’ parameter is not adjusted to a stable
motor operation and the motor tends to oscillate causing en
-
ergy to flow forward and backward from/to the motor.
In all situations the motor will start to work as a generator that
generate energy backward into the drive electronics.
Solutions to avoid error - Decrease the load inertia.
- Decrease the top speed and/or the acceleration value.
- Make sure that the supply voltage is within nominal range in
order to leave extra capacity at the internal capacitors.
How to return to normal
operation
- Reset the motor, clear the error bit(s) in register 35 or cycle
the power.
Error bit / Firmware name Bit 3 / ’UIT_ERR’
Message no. / Message
8 / ’Position Limit Exceeded’
Type / Motor action Unrecoverable error / Motor is set in passive mode.
Error condition The actual position of the motor is outside the value(s) speci-
fied in the ’position limit min.’ or ’position limit max.’ specified
in the ’error handling’ area of the main tab in MacTalk.
Possible cause of this error The motor has been commanded outside the value(s) speci-
fied in the ’position limit min.’ or ’position limit max.’ registers.
Be aware that the error can happen even if the motor is in pas-
sive mode and the motor is forced outside this range.
Solutions to avoid error - Set the position limits described above to more realistic val-
ues.
- Make sure that the position limits also cover worst case situ-
ation such as position overshot (if using a soft filter).
How to return to normal
operation
- Reset the motor, clear the error bit(s) in register 35 or cycle
the power.
Error bit / Firmware name Bit 7 / ’PLIM_ERR’