Stepper Motor Driver AD1431
YA7179-1/2
- 14 -
5-4. SW3 setting
When auto current down setting is selected, SW3 can set the driving current in the current down setting.
SW3 setting
：
SW3-1
SW3-2
SW3-3
Driving
current
Setting
ON
-
-
75%
-
ON
-
50%
-
-
ON
25%
When you change SW3, 100% of the driving current flows as shown below. Please note that the motor and
driver may produce heat if other than the setting location is selected. Please make the rotor keep at the
setting location without fail.
(To set SW3-1 and 3-3, turn the rotor of SW3 to the limit. To set SW3-2, stop the rotor so as to make the
rotor stop at the middle. (The rotor helps to stop at the middle.))
Motor driving current when you change the setting of SW3 with auto current down
5-5. LED display
The LEDs
（
D3 and D4
）
lights under the following conditions.
D3 : It lights green using +5V power supply generated by the DC-DC from the control power.
D4 : It lights red when the motor coil connected with the driver becomes short or open or when the
temperature of the driver IC raises and overheat protection circuit operates. In that cases, the motion
of the driver stops. To make the driver run again, please power off once and power on again.
5-6. Default setting
SW1
：
bit1
：
OFF, bit2
：
OFF, bit3
：
OFF, bit4
：
OFF
1 pulse method / 4W1-2 phase excitation, 1/16 steps
SW2
：
Setting 0
Driving current value 0.11A
SW3
：
Setting 2
To lower the current value to 50% after input pulse stops in the case that the ACD
function is selected.
Driving current
SW3-1 setting
SW3-2 setting
SW3-3 setting
Other than set value
Other than set value
Driving current
SW3-1 setting
SW3-2 setting
SW3-3 setting
Other than set value
Other than set value
