IDX 7505 Manual (V1.17 / 2011-APR-11)
35
Copyright © 2011, TRINAMIC Motion Control GmbH & Co. KG
•
RS485 parameters (set by command U)
•
Microstep resolution (set by command Z)
Example:
AW
⇒
ENTER:
All actual parameters from list above are stored to EEPROM.
7.2.1.11
Microstep resolution (Z)
The microstep resolution can be set by the user. It depends on the maximum resolution which differs
in the three different chopper modes (see 7.2.2).
The maximum resolution is set by the parameter
Z
.
Parameter Z
Microstep resolution
SPI
PWM
Phase (default)
0
max resolution
64 *)
64
256
1
1/2 max
32 **)
32
128
2
1/4 max
16
16
64
3
1/8 max
8
8
32
4
1/16 max
4
4
16
Table 7.9: Adjustment of microstep resolution
*) Simulated microsteps, the actual microsteps of the motor are not improved compared to Z = 1.
**) Simulated microsteps, the actual microsteps are improves but do not reach 32 microsteps.
Example:
AZ 2
⇒
ENTER: Sets the microstep resolution to a quarter of the maximum resolution.
7.2.2
Chopper modes
7.2.2.1
Chopper mode 0 (SPI) / default mode
In this mode, the motor coil current is regulated on a chopper-cycle-by chopper-cycle bias. This is the
standard operation mode for most motor drivers. It brings a medium microstep resolution of 16
microsteps and typically works well with most motors and a high range of supply voltage and motor
current settings. A resolution of up to 64 microsteps can be simulated but the motor precision is only
slightly improved compared to 16 microsteps and the same as with 32 microsteps.
