TMCM-013 Manual (V1.14 / January 17th, 2006)
19
Copyright © 2005, TRINAMIC Motion Control GmbH & Co. KG
6.2.1.7 Store Parameters to EEPROM (W)
This command stores different parameters to the EEPROM to restart with the same performance after
power down.
The stored parameters are:
•
Current setting (C)
•
Microstep resolution (Z)
•
Selected Mode (M)
•
RS485 parameters (U)
6.2.1.8 Microstep Resolution (Z)
The microstep resolution can be set by the user. It depends on the maximum resolution witch differs in
the three chopper modes (see 6.2.2).
The maximum resolution is divided by the parameter ‘Z’.
Microstep resolution
Parameter Z
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 6.7: Adjusting of Microstep Resolution
Example:
AZ 2
⇒
ENTER : Sets the microstep resolution to a quarter of the maximum resolution.
6.2.2 Chopper Modes
6.2.2.1 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 good with most motors and a high range of supply voltage and motor
current settings.
The maximum supply voltage (V
S
) of the motor must not exceed 22-25 times the nominal motor
voltage (V
N
), regarding the multiplication of I
COIL, MAX
and R
MOTOR
. A higher value would lead to an
excess of motor rating.
The minimum supply voltage has to be above two times the nominal motor voltage.
MOTOR
MAX
,
COIL
N
N
S
N
R
I
V
V
25
...
22
V
V
2
⋅
=
⋅
≤
≤
⋅
It uses a chopper frequency of about 36kHz.
