JVL MAC050 User Manual page 395

6.8
6.8.3 Troubles related to mechanical motor behaviour
Problem: "The motor oscillates or shakes"
The movement of the motor is very unstable and/or the motor oscillates when sta-
tionary.
Action:
- Ensure that the LOAD parameter is adjusted to a proper value. Default is 1.00 but
when a load is added to the motor, it can be set to a higher value. If the LOAD pa-
rameter is set to a value that is too high (or low), the motor can be very unstable.
- Check also that the maximum speed is set within the allowable range specified for
the actual supply voltage - see
graph illustrates the relationship between supply voltage and recommended speed.
- If none of the above mentioned solutions solves the problem, the filter used in the
MAC motor may not be able to handle the actual load. Use the filter-optimise func-
tion or contact your nearest JVL representative.
Problem: "After power up the motor oscillates and there is no communication"
The LOAD parameter value is set too high and is causing the total supply current to
rise above the limit which the power supply can handle. This situation can typically
occur if the motor is dismounted from the mechanical load for which the LOAD has
been adjusted. Normally the motor will start to oscillate if the LOAD is increased
above 1.4-1.8. Default is 1.0 without any mechanical load connected.
Action:
The fact that the power supply is overloaded makes the supply voltage drop below
the level at which the internal microprocessor in the MAC motor is operational. The
only work-around solution to this is a firmware update but all the parameters will be
reset to default!
Choose "update firmware" in the "Update" menu and switch on the motor. The
firmware update will "catch" the motor before it starts to oscillate and refresh all the
settings in the motor.
JVL A/S - User Manual - Integrated Servo Motors MAC050 - 4500
Trouble-shooting guide
Power supply (only MAC050 to 141), page 89 where a
391