Digital Microstep Driver DM556N
8
4.2 Standstill Current Setting
The standstill current can be set with the SW4, OFF means the standstill current is set to about half
of the dynamic current (60%), and ON means the standstill current is the same as the operating
current. In general, SW4 should be set to OFF, so that the heat generated by the motor and the driver
is reduced, and the reliability is improved. After the pulse train stops for about 0.2 seconds, the
current is automatically reduced to 60% of the set value, and the heat output is theoretically reduced
to 36% (heat generation is proportional to the square of the current). When set to OFF, the motor's
start response will be faster.
4.3 Microstep Resolution Setting
Microstep resolution is set by SW5-SW8 of the DIP switches as shown in the following table (the
table is use for 1.8° motor):
Microstep
Pulses/rev.
SW5
SW6
SW7
SW8
2
400
OFF
ON
ON
ON
4
800
ON
OFF
ON
ON
8
1600
OFF
OFF
ON
ON
16
3200
ON
ON
OFF
ON
32
6400
OFF
ON
OFF
ON
64
12800
ON
OFF
OFF
ON
128
25600
OFF
OFF
OFF
ON
5
1000
ON
ON
ON
OFF
10
2000
OFF
ON
ON
OFF
20
4000
ON
OFF
ON
OFF
25
5000
OFF
OFF
ON
OFF
40
8000
ON
ON
OFF
OFF
50
10000
OFF
ON
OFF
OFF
100
20000
ON
OFF
OFF
OFF
125
25000
OFF
OFF
OFF
OFF
5. Power Supply Selection
The driver can work normally between DC20V-50V / AC15V-40V. Please note that the peak ripple
of the power supply should not exceed this value. If using a transformer to supply power, you should
consider the fluctuation rate of the local power grid to select the appropriate transformer power
supply. If using a DC power supply, be aware that the output current range of the power supply
needs to be greater than the operating current of the motor.
5.1 Power Supply Precautions
(1). It is best to use an unregulated power supply.
(2). When using an unregulated power supply, the output power of the power supply needs to be
greater than to 60% of the driver set current.
