DCH20403, 2 Phase Stepper Motor Driver

 Instruction manual of 2  phase combined stepper motor drive
DCH-20403M series
Controlled  by constant current with stable running and reliable performance
Technology  Feature
10V~40V DC power  supply, H bridge, double pole, constant phase current drive
8 output current with the max is 3A for selection, 7 sifting models for selection with the max sifting is 64. Input signal is optical separation, 20403M standard common cathode  single impulse connection port, 20403M standard common anode single impulse connection port
Reserve  performance when power off: the semi-closed frame can be used under environment  with strict requirement.  It has  automatic half-current lock performance, which can save energy.

Power  Supply Voltage
The  design of inside switching power supply can provide a wide voltage range, which  can adjust between 10V and 40V (DC) as the customer required. Usually, the high  rated voltage can improve the high speed torque of the motor but the  consumption is also much highly and the temperature will increase highly.

Output  Current Selection
The  max output current of the drive is 3A/phase,  it has 8 selections by different choose with No.5, 6, 7 switch on the drive  panel, and there will be 8 different currents accordingly from 0.9A to 3A, which can be used for different motors. Please  refer to the current selection table.
Note:  The actual switch position is opposite to the white square on the panel.

Sifting  Selection

There  are 7 different running models, whole, half, 4, 8, 16, 32 and 64 sifting, it  can has been realized by the different selections with No. 1, 2 and 3 switches  on the panel.
Note:  The actual switch position is opposite to the white square on the panel.

Automatic  Half-current
 The drive will run with energy-saving condition  (half current) if there is no impulse signal within half second, and the phase  current of motor winding will reduce to the half of the setting value, which  will reduce the consumption of motor and drive. But the output torque of the  motor will reduce accordingly. The drive will go back to the rated value when  the next impulse comes.
Incorrect  Phase Protection
 The customer is easy to wire  incorrectly when connect the 2 phase motor to the drive, which will result in  the drive is damaged. The drive is designed with incorrect phase protective  circuit, so even the customers wire incorrectly, the drive will not be damaged  but the motor can not run normally at that time. Usually, when it happens, it  will have small force. In case of that, please check the wiring.
Radiation
 Most  breakdowns are caused by working under over high temperature, so the effective  heating radiation can improve the reliability and service life. It is  recommended to fix the drive toughly on metal case, then the bottom panel will  help I to radiate. It can also add silicon grease as the conductive material on  it if possible.  Surely, the temperature  will be better control if there is a radiating fan outside.

Input  Signal
Public  port: DCH-20403M drive adopts common cathode wiring way, the user connect the cathode of input signal to the terminal, and connect the input  signal to the relative signal terminal. It will be effective when the power  level is low the time when the inside optical couple is conductive, and the  control signal input into the drive.

Impulse  signal input: The impulse signal  under common cathode will decrease and will be encoded as an effective impulse  by the drive, and it will drive the motor to run. To make sure the reliable  response of the impulse signal, the last time during lower power level impulse  under common cathode should be more than 10μs. The response frequency of the drive is 70 KHz, the over  high frequency will not be response.

Direction  Signal Input: The low and high  power level signal is to control the 2 rotate direction of the motor. It means  high power level input when during the common cathode.

Make sure the direction  signal is at least 10μs  before the impulse signal when control the rotate direction of the motor, for  it can avoid the response for the wrong impulse.

Power-of Signal  Input:
It receives the high/low power  level signal form the control case, the motor current will be shut off when the  common cathode with high power level and the rotor will be locked.

Note: ①The wiring of the drive (DCH-20403MB) input signal is  common cathode way. The low power level of the controller is connected to the public port of the drive, the impulse, direction and power-off signal of controller is still connected to impulse, direction and power-off signal of the  drive. ②The customer should specify in advance if want to by  the common anode drive, otherwise we will provide common cathode drive

Signal Requirement    
The drive is controlled  by single impulse (common cathode/anode). Impulse, direction and power-off  signal is separated by the optical coupling. The current should be between  5mA~12mA to make sure the optical coupling well work. The current-limit  resistance inside the optical coupling is 510Ω, +5V power level. It can add resistance to limit the current as you required when the input voltage is higher.
e.g. The input power  level is +24V, it should connect in series with 2.4KΩ (0.25W)  resistance in each signal.
If the input power  level is +12V,  t should connect in  series with 1KΩ (0.25W) resistance in each signal.
Note: Current-limit  resistance can not connect to the public port of the drive.
Typical Wiring Drawing

Note:
In order to use the drive properly, please separate  the power wiring (motor phase wiring, power supply wiring) to the weak power  wiring, which will avoid the signal being interrupted. If it can not wire separately  or it can not identify whether there is strong interrupted substance (transformer, magnetic valve) or not, it had better to use H-cable to transfer  the signal. The higher power level control signal is also interrupted  resistance.