DC Controller 303

The DC controller 303 is a digital DC servo driver developed with DSP and high efficient MOSFET technologies. In position control, it's easy for the end users to change stepping drivers to the DC controller 303 without changing control systems, because its input command is PUL/DIR signal, which is compatible with that of stepping drivers. In low power motion control applications, performances of DC servo systems using the DC controller 303 are better than those of digital AC servo systems in velocity, precision, stability, or at least as good as those of digital AC servo systems. However, the cost of the DC controller 303 stays at the price line of stepping driver, namely far lower than those of AC servo drivers.

The DC controller 303 is a microsize brush DC servo drive. It is an ideal choice for those applications in which the mounting space for the driver is limited and higher output power is not necessary.

The DC controller 303 is very easy to tune and all parameters are visible. Handheld and PC based tuning tools, including ProTuner (Windows based setup software) and STU (Small servo tuning unit) can meet different tuning environments or requirements.
Input Voltage: 18-30VDC
Output Current: 3 A (Cont.), 15A(Peak), Power range: 5-90W.
Based on DSP control technology and high smooth servo control algorithm.
Handheld and PC based tuning tools, including Pro Tuner and STU.
Feedback resolution ? encoder line count.
Position Following error lock range adjustable
Position error can be eliminated to 1 count, and velocity error can be eliminated to the Desired Velocity* ±0.3%
Electronic gear ratio from 1/255 to 255
Built-in motion controller for self-test with trapezoidal velocity profile
Support PUL/DIR control signals
Opto-isolated inputs, support single-ended signals
10 latest errors self-record function
Over-current, over-voltage, phase error, encoder error, position following error protections
Small size, surface-mount technology
Suitable for a wide range of equipments and instruments such as mini type engraving machines, inkjet printers, etc. It performs better in the applications require low noise, high velocity, high precision and high reliability.

Mechanical Specifications
dc controller sakhtar 303 1.gif
Elimination of Heat
 Drive’s reliable working temperature should be <70 o C[158 o F], and motor working temperature should be <80 o C[176 o F]; It is recommended to mount the driver vertically to maximize heat sink area.
Mechanical Specifications


Electrical Specifications
Min Typical Max Unit
Peak output current 0 - 15 A
Supply Voltage +18 +24 +30 VDC
Logic Signal current 7 10 15 mA
Pulse input frequency 0 - 200 kHZ
Isolation resistance 500     Mohm
Current provided to encoder     50 mA

Connector Configuration
General information
Control Signal Connector
Pin Signal Description I/O
1 PUL Pulse control signal 1
2 DIR Direction control signal 1
3 OPTO +5V Opto-isolated Power input 1
4 ENA Enable control signal, can be used to clear position following error 1
5 ERR Error output signal, HIGH indicates normal,LOW indicates fault. 0
6 EGD Opto-isolated GND,use for reference when using ERR GND
Encoder Signal Connector
Pin Signal Description I/O
1 EB Encoder channel B input I
2 EA Encoder channel A input I
3 E +5V Positive pole of the auxiliary power supply (50 mA (Max)). O
4 EGND Ground of the auxiliary power supply GND
Power Connector
Pin Signal Description I/O
1 Motor+ Motor positive connection. O
2 Motor- Motor negative connection. O
3 +Vdc +18 TO 30 VDC power input. I
4 GND Power Ground. GND
RS232 Communication Connector
Pin Signal Description I/O
1 +5V +5V power only for STU. O
2 TxD RS232 transmit. O
3 GND Ground. GND
4 RxD RS232 receive. I
More about PUL/DIR/ENA Signals
Pin Function Details
PUL Pulse signal: This input represents pulse signal; 4-5V when PUL-HIGH, 0-0.5V when PUL-LOW. For reliable response, pulse width should be longer than 2.5µs. Series connect resistors for current-limiting when using +12V or +24V control signals (OPTO). The same as DIR and ENA signals.
DIR DIR signal: This signal has low/high voltage levels, 4-5V when DIR-HIGH, 0-0.5V when DIR-LOW. For reliable motion response, DIR signal should be ahead of PUL signal by 5µs at least. Please note that motion direction is also related to motor-driver wirings and encoder feedback A/B phase signals. Exchanging the connections of two wires of the motor to the driver and A/B phase signals of encoder will reverse motion direction.
ENA Enable signal: This signal is used for enabling/disabling the driver. High level (NPN control signal, PNP and Differential control signals are on the contrary, namely Low level for enabling.) for enabling the driver and low level for disabling the driver. Usually left UNCONNECTED (ENABLED).
ERR Error signal: This pin will be pulled to LOW level (reference to EGD) when driver goes into faulty status. There is a 10K resistor connected between ERR and OPTO. Please refer to figure 2 in Control Signal Connections for more details

Encoder Connections
Encoder DC Controller 303 1.gif

The DC controller 303 supplies the encoder directly
Encoder DC controoller 303 2.gif

Using external DC power supply to supply the encoder
RS232 Interface Connection


RS232 Interface Connection 3 .gif

Professional Servo Tuning Software ProTuner

Professional Servo Tuning Software ProTuner 4.gif 

Main Window of ProTuner
Position following error curve and velocity curve (Kp=3200, Ki=150 and Kd=2000) 5.gif

Position following error curve and velocity curve (Kp=3200, Ki=150 and Kd=2000)
Typical Connections
DC Controller 303 6.gif

Typical connection (Open-collector control signal.)
DC Controller 303 7.gif

Typical connection (Differential control signal)

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