Technical Details
Ndrive HP 10/20/30 User’s Manual
3-16
www.aerotech.com
3.3.4.2. MXH Option
The MXH encoder input options are defined for a differential analog encoder in the
range of 0 to +5 volts. The maximum encoder input frequency is limited to 200 kHz, or
less if the encoder signals are to be output via the SSI Net, see Table 3-17. The MXH
multiplies the resolution up to 512 times, in addition to the controller’s x4 multiplication,
providing a maximum of x 2048 multiplication (8.388607 GHz effective data rate), as
shown in the first two columns of Table 3-17.
The MXH multiplication factor is determined by the CfgFbkEncMultFactorMXH axis
parameter, which is then multiplied x4 additionally by the controller. Each time this axis
parameter is changed, the controller will internally re-program its logic. This re-
programming cycle will take about 3.5 minutes. The LED’s will indicate that the internal
MXH option is being internally erased and then re-programmed, and that the axis may
not be enabled during this time. While the -MXH option is being erased, the LED’s will
indicate the pattern shown to the upper right. When the -MXH option is being re-
programmed, the LEDs will alternate between the two patterns shown to the lower right.
The Ndrive contains digital potentiometers to adjust the gain, offset and phase balance of
the analog Sine and Cosine inputs. The digital potentiometer settings are controlled by
the CfgFbkEncCosGain, CfgFbkEncCosOffset, CfgFbkEncPhase, CfgFbkEncSineGain,
CfgFbkEncSineOffset axis parameters. The –MXH option is compatible with the –
DUALPSO and –TRIPLEPSO options. A differential line driver encoder may be used
also, see Figure 3-9 for more information.
The specifications for the -MXH multiplier option are shown in Table 3-17. The
following table indicates the maximum specifications for the MXH option when the
signals are output via the SSI Net. Otherwise, the only limit is the maximum input
frequency of 200 kHz. See Figure 3-9 for MXH typical input circuitry. The Pin
Assignment is indicated in Table 3-11.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
