EM-347B is a brushless DC-motor driver with hall sensor feedback. The unit has a mosfet power stage with good efficiency and it meets today's EMC requirements. The driver can be used with 120° commutation. This driver has true 4Q power stage, which makes it possible to use regenerative braking. In this braking method the supply voltage rises, but voltage rising can be controlled with a braking resistor. If using battery supply, then the braking energy can be lead back into the battery and a braking resistor will not be needed. The unit has basic digital command inputs like direction, brake, start/stop, disable and there are analog inputs for speed and current control. One digitally presetable second speed (speed-2) is possible to activate with digital command input. EM-347-48V has two NPN outputs for fault and overcurrent indication use. Some input and output functions can be modified with parameters. Driver includes overvoltage, undervoltage and overtemperature protection. These fault situations are indicated with fault on-board LED. Overtemperature and current limit situations can be reset with reset input, reset-timer or by setting analog speed control to value to 0.
There are two control options for speed. Direct control ( open loop ) sets motor voltage in propotion to control voltage as with a standard DC-motor. Closed loop uses hall sensor feedback for speed control. This mode offers good speed regulation. Start and stop ramps work in both modes. Speed adjust range, closed loop rpm range and ramps can be set with parameters. Anolog inputs are filtered so that they can also use PWM signal for controlling speed and current.
Settings can be done digitally with EM-236 interface unit or with Emen-Tool lite program installed in PC and EM-268 adapter cable. Parameters are stored into non-volatile memory of device. This interface unit can also monitor the current and rpm of motor. If necessary, the device also has an optional cooling fan available, which can be controlled with its designated output. This output switches on fan, when temperature rises over 65 deg.
This B-version has added shutdown control input to set driver to the low power consumption mode and also there is added Rs-485 port for Modbus communication. B-version has also few new stop braking option. In "stop brake" mode the all motor wire shorted in stop situation and it gives better hold torque as usually. The another special stop mode is "hold current" this generates very strong hold torque.
The device can be installed in DIN-rail base and some enclosure options are also available.
| TECHNICAL DATA EM-347B | |
|---|---|
| Supply voltage | 12-48V (11-60Vdc) |
| Overvoltage limit | 15-65V (adjustable) |
| Idle current | typ. 30mA |
| Idle current, shutdown (GND) | 0.2mA |
| Max current | 50A cont. (Tamb. 50°C) |
| Max current with fan | 60A cont. |
| Max current peak | 80A (max. 5s) |
| Max brake output current (pin-21) | 20A |
| Brake resistor recommended value | 1.5-10Ω |
| PWM frequency | typ. 16kHz |
| Overtemperature shut down | 90°C |
| Fan activation temperature | "on" > 65°C |
| Current limit setting | 1-100A (step 1A) |
| Current limit analog scale | 0-5V = 0-100A |
| Logic level of digital inputs | "off" = 0-1V or open / "on"= 4-30V |
| Input impedance of logic inputs | 10k |
| Shutdown input | Open or GND (GND = low idle) |
| Response time of digital input | 2ms |
| Analog input range | 0-5V up to 0-10V |
| Input impedance of analog inputs | 100k |
| Input filter of analog input | 100Hz |
| RS-485 | 9600 / 19200 baud, Modbus RTU |
| Overcurrent output | NPN max. 2A / 60V |
| Fault output | NPN max. 50V 50mA |
| Fan output | 12V max. 100mA |
| EMC | Measured for industrial environment |
| PCB material flammability class | UL94V-0 |
| Dimensions | 140x122x43mm (56mm with fan) |
| Weight | 520g / with fan 550g |
