© Arun Microelectronics Ltd 2015
6. TROUBLESHOOTING.
Motor does not rotate.
Check that the motor is wired to the connector corresponding to the motor selected on the Program/Manual switch.
Ensure that the "Maximum Speed" control is rotated to approximately the mid-range position.
Check that the temperature indication is less than 175.
Press "Step" and observe the Motor Moving LED. If it flashes check the motor wiring. If it does not flash, switch the
instrument off for a few seconds and then on again, observing that both "Motor Moving" LEDs flash briefly several
times, then press "Step" again.
Temperature indication > 175.
Check that the thermocouple is connected to the correct socket for the motor in use.
If this error occurs as soon as a program is run ensure that the program defines which motor is in use early and before
any motion is commanded.
The thermocouple circuits in the instrument are arranged to give a high temperature indication (>175C) when the
thermocouple is open-circuit. Check the continuity of the thermocouple at the connector pins. Thermocouple wire
has a relatively high resistance, so some tens or hundreds of ohms may be expected. Check that the 'Motor
Temperature' LEDs are extinguished if the thermocouple socket is shorted with a wire.
Normally the motor temperature will not exceed 100C when operated in air at room temperature.
Correct use of the motor thermocouple is essential to the protection of the motor in vacuum.
Motor buzzes but does not rotate or rotates intermittently.
Check all motor connections, and that the electrical resistance between the pins on the motor connector is consistent
with that expected for the motor in use. Motors will sometimes move even if they are wired incorrectly.
If using program control ensure that the specified start/stop speed and number of steps in the acceleration ramp are
reasonable. If using manual control check that the "Maximum Speed" control is not set too high.
Motor stops and buzzes at some speeds or locations.
Check all motor connections, and that the electrical resistance between the pins on the motor connector is consistent
with that expected for the motor in use. Motors will sometimes move even if they are wired incorrectly.
If the motor is wired correctly this may be due to resonances, refer to section 4:3 for general advice.
Motor stops and buzzes at high speeds.
The maximum speeds AML motors are capable of are less than the maximum that the SMD210 can drive. The
maximum speed of a motor will be reduced by any loading. The maximum speed which can be achieved will be
increased by increasing the number of steps in the acceleration ramp.
Motor direction reverses at some speeds.
Check all motor connections, and that the electrical resistance between the pins on the motor connector is consistent
with that expected for the motor in use. Motors will sometimes move even if they are wired incorrectly.
If the motor is wired correctly this may be due to resonances, refer to section 4:3 for general advice.
Motor rotation reversed.
Correctly wired motors and drives should cause the motor to rotate in the direction specified when viewed from the
mounting stud end. The direction of rotation may be reversed by exchanging the connections to one phase.
(94 pages)
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