VXI VT1538A user manual Stepping mode values, Relationship of minvel, and maxvel

•<mode> is used to select the stepping mode. the allowable values are:

Table 3. Stepping <mode> values

<mode> string	Stepping Mode	Speed	Channel
MFSFC2	Full	Full	2
MFSFC4	Full	Full	4
MFSHC2	Full	Half	2
MFSHC4	Full	Half	4
MHSFC2	Half	Full	4

Related error message:3127, "Undefined E1538 Stepper motor mode."

•The range of position values that an algorithm can send for the full-speed ("SF") mode is 0 to 65,535.

•The range of position values that an algorithm can send for the half-speed ("SH") mode is 0 to 32,767.

•<min_vel> is specified in steps per second and is the beginning step rate at the start of the 14 or 38 step ramp-up to <max_vel>. The <min_vel> should be a step rate that the motor can achieve from a standstill without missing a step. <min_vel> can range from 128 to 40,000 (64 to 40,000 for half speed "SH" modes).

•<max_vel> is specified in steps per second and is the maximum step rate that will be sent to the motor after ramp-up is complete. <max_vel> can range from 128 to 40,000 (64 to 40,000 for half speed "SH" modes).

•The increase in step rate from <min_vel> to <max_vel> will occur in 14 steps for a 2-Channel configuration, and will occur in 38 steps for a 4-channel configuration. Figure 25 shows the relationship between these parameters. A related error message: 3120, "Minimum velocity parameter must not exceed maximum velocity parameter."

Figure 31. Relationship of min_vel, and max_vel

•Four-phase stepper motors that require less than 100mA phase current

68 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP