EM-348C is a full bridge DC-motor starter. It is designed to work with DC-motor in applications where some special functions are needed. Driver has 4-quadrant full-bridge powerstage, and also brake control power output. The powerstage can be selected for use with two different frequency, the one is efficient and the other is silent . The powerstage uses smooth switching technology and has very low EMC emission. Parameter allows powerstage to be set brake or freewheel mode when stand-by.
This device is designed to control with Rs-485 Bus.The control bus use Modbus RTU protocol and with the Bus there can be set, speed, direction, accelaration and deceleration ramps and current limit. Also the monitoring and parameter setting are possible with the Bus. There is a separate instruction for operating the bus.
Device has also some local control inputs FW and BW for start the forward and backward run. STOP is for the motor shut-down but there are also available individual limit inputs for FW and BW directions. FAULT terminal has at the same time input and output function, the pin is normally low, and in fault situation it will pull up for examle if overheat of current trip occurs. If FAULT-line is pulled up externally it will cause a stop and prevent the new start, so it works like Disable input. For example: if system has several units and those
FAULT pins is connected together, then Fault of one card will disable other units also,
Device has two selectable control modes, continuous and impulse. In continuous mode the motor runs as long as the control is active. In impulse mode a short comand starts the motor, and only a new impulse will change the status. There is also few special settings start-kick and auto reverse. The card has selectable input logics. Inputs are divided in two groups, control and limit -inputs. Groups can be individually set for NPN or PNP logic.
| TECHNICAL DATA (PCB v1, Prog. EM-348-C v1.9) | |
|---|---|
| Supply voltage (continuous, max.) | 10-35V |
| Overvoltage limit (adjustable) | 15-40V (hardware limitations) |
| Start-up voltage | 9V |
| Shutdown voltage | 8V |
| Continuous current output (@ 15°C ambient) | 15A at 100% speed / 10A at 5-99% speed (PWM = 2kHz) |
| 10A at 100% speed / 5A at 5-99% speed (PWM = 16kHz) | |
| Peak current (5s) | 30A at 2kHz PWM, 25A at 16kHz PWM |
| Current limit (adjustable) | 0.1-25A (Max. 30A at start) |
| 6A version current (typical) | ~2.5 times smaller than standard |
| Overheat limit | 100°C |
| Start/stop ramp (adjustable) | 0-5s |
| PWM frequency | 2kHz / 16kHz |
| Input control logic | High = 4-30V, Low = 0-1V |
| Control input impedance | Typ. 47kΩ |
| Limit/pulse input (pin 2 and 3) impedance | Typ. 10kΩ |
| Control input response time | Typ. 5ms |
| Fault output (PNP open collector) | 12-22V / Max. 50mA |
| Brake output (NPN open collector) | Max. 35V / 2A |
| Min. brake resistor | 6.8Ω @ 12V / 15Ω @ 24V |
| Disable input (active) | Uin > 4V (PNP) |
| Bus communication | RS-485, two-wire half-duplex, 9600 kbps |
| Motor and supply connectors | 2.5mm² |
| Control connectors | 1mm² |
| Dimensions | 42 x 72 x 25mm (6A version: 18mm height) |
| Dimensions (DIN-rail base) | 45 x 80 x 45mm |
| CE-tested for industrial environment (EMC) | Yes |
| Operating temperature (Ta) | -40...60°C |
| Weight | 75g |
