EM-241 is a full bridge DC-motor starter. It is designed to work with DC-motor in applications where some special functions are needed. Starter has adjustable acceleration and deceleration ramps, which make possible the smooth starts and stops. Adjustable current limit protects motor against overcurrent and it can also be used as an end-stop. This device has also two settable speeds, which are usefull in positioning applications. Control inputs FW and BW start the forward and backward run. STOP is for the motor shutdown. In -PLI program version there is added PULSE COUNTER which can be used for end limit use. This counter value keep in memory of card also when power is turned off. SPEED-2 input activates preset speed-2, but it can also be used as input for analog speed control signal 0-5V. FAULT terminal has at the same time input and output function, the pin is normally high, but is pulled down in overheat and conditionally also in current trip situation. If FAULT-line is pulled down externally it will cause a stop and prevent the new start. For example, it is possible to link fault pins of several units together and achieve a syncronous stop.
There are 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. The parameters are set with EM-236 interface unit. Operation of the controller and some of its functional values can also be monitored with EM-236 interface unit.
| TECHNICAL DATA | |
|---|---|
| Supply voltage (cont.) | max. 10-35V |
| Overvoltage limit | adjustable 15-40V (connect motor to freewheel) |
| Overvoltage dynamic brake | 40V (shorting motor poles) |
| Start-up voltage | 9V |
| Shutdown voltage | 8V |
| Motor current (cont.) | max. 15A |
| Motor current (peak) | max. 30A |
| Current limit adjustable | 0.1-20A (max. 30A at start) |
| Overheat limit | 100°C |
| Start and stop ramp | adjustable 0-5s |
| PWM frequency | 2kHz |
| Speed input scale (speed-2) | 0-5V = 0-100% PWM |
| Input control logic | High = 4-30V, Low = 0-1V |
| Control input impedance | typ. 47kΩ |
| Pulse input impedance | typ. 10kΩ |
| Pulse input frequency (max.) | 1000Hz |
| Control input response time | typ. 5ms |
| Fault output | NPN open collector, max. 30V / 50mA |
| Fault input active | Uin < 1V (NPN) |
| Motor and supply connectors | 2.5mm |
| Control connectors | 1mm |
| Dimensions | 42 × 72 × 25mm |
| Dimensions (DIN-rail base) | 45 × 80 × 45mm |
| CE certification | Tested for industrial environment (EMC) |
| Operating temperature (Ta) | -40...60°C |
| Weight | 75g |
