Motech LPS-300 series

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Motech LPS-300 series
Motech LPS-301 logo.png
Status planned
Channels 1/3
Voltage/current (CH1) 0-30 V / 0-max. 3 A, model-dependant
Voltage/current (CH2) 0-30 V / 0-max. 3 A, model-dependant
Voltage/current (CH3) 3.3/5 V / 0-max. 3 A, model-dependant
Connectivity RS232
Features output on/off, calibration

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. Another command sent before reception of the reply (usually OK) will be ignored. It seems that trailing digits for numerical parameters can be left away.

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
There seem to be no plausibility checks and the description is incomplete. Messing around with the calibration is strictly discouraged and can cause odd behaviour!
HELP see right Output command list (several lines)
IOUT(n) d.dddd Current readback
ISET(n) d.dd ? Set output current
LOWA(0|1) ? CC output compensated 0=off; 1=on (what is that?)
MODEL LPS- Get model number (reply seems to be incomplete, bug?)
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 0=independant; 1=from channel 1; 2=from channel 2
VDD(0|3|5) ? Set ("digital") output 3 0=off; 1=3.3 V; 5=5 V
VERSION Ver-1.17 Get version number.
VOUT(1|2) dd.ddd Voltage readback
VSET(1|2) dd.ddd OK Set output voltage. Entering more than 3 post-dot digits will overwrite starting from the left!
* \r\nERROR Error

Resources

  • LPS-301 - LPS-304 User Manual [1]
  • LPS-305 User Manual [2][3]
  • Datasheet [4]