Rev G Apr 2019
Page 15
Chapter 4 Operation
4.4 Position Error Messages.
4.5 Transportation
Caution
The maximum velocity at which the encoder can operate is approximately 3000
mm/sec. Above this speed, encoder pulses may be lost and, as a result, the
position readout becomes incorrect. This renders normal operation impossible
because phase commutation of the motor is also based on the encoder reading.
When the stage is controlled by the KBD101 controller, the maximum velocity
is limited to safe values. However, if the output is disabled (with the controller
connected and monitoring the position) and the stage is moved manually at
high speeds, it is possible to exceed this limit. If the KBD101 controller is
subsequently used again to move the stage, the incorrect encoder reading will
cause incorrect operation, often resulting in sudden uncontrolled moves. It is
therefore important not to move the stage excessively quickly when it is moved
manually.
The KBD101 controller has fault monitoring to detect the loss of encoder
pulses. If this fault occurs, an error message will be generated and the
controller must be powered down and re-started so that correct phasing and
commutation can be established.
Caution
When packing the unit for shipping, use the original packing. If this is not
available, use a strong box and surround the unit with at least 100 mm of shock
absorbent material.
