Mach-DSP User’s Manual
Document Number: MACH-DSP-9021
Page 44
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range. When the colored block is red, this indicates either that the scanner is not
connected, or that there is an electrical fault with the scanner or the connecting cable.
Scanner coil temp:
This shows you an estimate of the scanner coil temperature.
Depending on the settings found in the “Coil Temperature Calculator“ section of the
Advanced tab, the estimate can either be based on the amount of current flowing
through the scanner, or the estimate can be based on the measured coil resistance
during servo operation. For more information see the “Coil Temperature Calculator”
section of this manual.
The “Scanner coil temp” label will change color, depending on the temperature of the
coil. For example, when the coil temperature reaches 50C, the label will become yellow.
When the coil temperature reaches 60C, the label will become orange. When the coil
temperature becomes 80C, the label will become red. This color change is meant to be
an additional indication of coil temperature.
In addition to the label color providing an indirect indication of temperature, there is a
colored block to the right of the label. When the colored block is green, this indicates
that the scanner coil has not exceeded the maximum that is specified in the “Pangolin
only” tab. When the colored block is red, this indicates that the “Maximum temperature
before servo fault” has been exceeded, in which case the servo will be shut down for
several seconds, before it is re-started. The temperature itself will also change color
depending on the coil temperature.
(Note that the estimated temperature will be more accurate if you attach a thermistor to
the X-Y mount and connect it to the Test Interface connector, as described in Chapter
3.5 of this manual.)
Position within valid range:
When the colored block is green, this indicates that the
position signal is within a normal operating range. When the colored block is red, this
indicates that the position signal has exceeded the range indicated by the “Position fault
detector” portion of the Advanced tab.
Power amplifier clip status:
When the colored block is green, this indicates that the
power amplifier that drives the scanner is operating completely within its linear range.
When the colored block is yellow, this indicates that the power amplifier is saturated.
For many applications (for example laser displays), power amplifier saturation is
completely expected. For applications that require completely linear and deterministic
servo behavior, this could be an indication that the command signal requires structuring,
or that the slew rate limiter and/or error modifier need to be adjusted.
Slew rate limiter status:
When the colored block is green, this indicates that the input
command signal has not exceeded the slew rate limiter settings, and thus, that the slew
rate limiter has not had to take action and modify the command signal. When the
colored block is yellow, this indicates that the slew rate limiter is actively modifying the
input command signal.
