Motech LPS-300 series
The Motech LPS-300 series of programmable power supplies consists of 5 1-channel or 3-channel devices with optional RS232 connectivity.
The devices were also sold as the Amrel LPS-301 by American Reliance and partly under further brands.
Specifications
The models differ only in the number of available channels, maximum voltage and maximum current output:
| Model | Power Output | Channels | Voltage/Current |
|---|---|---|---|
| LPS-301 | 30 W | 1 | 30 V/1 A or 15 V/2 A |
| LPS-302 | 60 W | 1 | 30 V/2 A or 15 V/4 A |
| LPS-303 | 90 W | 1 | 30 V/3 A |
| LPS-304 | 70 W | 3 | ±30 V/1 A or ±15 V/2 A; 5 V/2 A |
| LPS-305 | 165 W | 3 | ±30 V/2.5 A; 3.3 or 5 V/3 A |
These specifications are common to all models:
| 30 V Channels | ||
|---|---|---|
| Voltage | Current | |
| Programming Resolution | 10 mV | 1 mA |
| Programming Accuracy | 0.05% + 20 mV | 0.15% + 5 mA |
| Readback Accuracy | 0.1% + 20 mV | 0.2% + 5 mA |
| Ripple (10 Hz to 20 MHz) | 1 mV rms / 10 mV p-p | 10 mA rms |
| Load Regulation | 0.001% + 1mV | 0.01% + 1mA |
These specifications apply only to models having a 3.3V/5V output:
| 3.3/5V Channel | ||
|---|---|---|
| Voltage | Current | |
| Ripple (10Hz to 20MHz) | 2 mVrms / 10mVp-p | 10mArms |
| Load Regulation | 0.001% + 1mV | 0.01% + 1mA |
Protocol
The communication with the device is via an optional RS-232 port (Option 02). The port parameters are 2400 Baud, 8n1.
All commands are plain ASCII. All commends are terminated by \r, \n or \r\n. A commend sent before the reply (usually OK) will be ignored.
| Commend | Reply | Description |
|---|---|---|
| BEEP(0|1|2|3) | OK | Beeper function 0: disable; 1: enable; 2: force alarm 3: off |
| CALI(0|1|2) | ? | Calibration 0=end; 1=begin; 2=input parameter |
| HELP | ? | Output command list |
| IOUT(n) | ? | Current readback |
| ISET(n) d.dd | ? | Set output current |
| LOWA(0|1) | ? | CC output compensated 0=off; 1=on (what is that?) |
| MODEL | ? | Get model number |
| OUT(0|1) | OK | Disable/enable output |
| STATUS | <decimal> | Working status, bitwise encoding. Bit 0, channel 1 mode: 0: CV 1: CC. Bit 1, channel 2 mode: 0: CV 1: CC. Bit 3,2, tracking: 00: independant; 10: to channel 1; 11: to channel 2. Bit 4, digital output 3: 0: off; 1: on. Bit 5, digital output voltage: 0: 5 V; 1: 3.3 V. Bit 6, output 1/2: off; 1: on. Bit 7, output 3: 0: ok; 1: overloaded. Bit 8, Fan: 0: off; 1: on Bit 9, beeper: 0: off; 1: enabled Bit 10, CC output compensated: 0: off; 1: on |
| TRACK(0|1|2) | ? | Tracking independant/from channel 1/from channel 2 |
| VDD(0|3|5) | ? | Set ("digital") output 3 0=off; 1=3.3 V; 5=5 V |
| VERSION | ? | Get version number. |
| VOUT(n) | ? | Voltage readback |
| VSET(n) dd.ddd | ? | Set output voltage
|
| * | \r\nERROR | Error message |