HA0409T Rev B Aug 2021
BBD30x Series Brushless DC Servo Controllers
There is maximum stage velocity at which the encoder can operate (which is
motor-dependent). 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 BBD30x controller, the maximum velocity is
limited to safe values. However, if the output is disabled (with the controller
connected and monitoring the encoder position) and the stage is moved manually
at high speeds, it is possible to exceed this limit. If the 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 BBD 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 re-
established.
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Chapter 4 Operation from the Front Panel
4.1 Introduction
The BBD30x can be used to drive attached stages directly via the front panel controls
and display screen, without the specific need of a computer connection and its
peripheral software; only a mains power connection is needed, together with electrical
connections to each stage (15-pin D plug, and 8-pin DIN plug for each stage).
However, the fullest functionality is available if the front panel is used in conjunction
with APT software - described in more detail in Chapter 5 - and this will need a USB
connection to the computer.
This section describes the functionality and use of stage control via the front panel of
the BBD30x controller. Throughout the chapter, examples are given assuming linear
stages are being addressed. For rotary stages, the same functionality is available (so
replace linear speed/acceleration/position with their angular counterparts). Any
differences are specifically addressed in section 4.9.
Caution
Summary of Contents for BBD301
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