PROGRAMMABLE DIGITAL POWER SUPPLY - FREE AIR COOLING

INTRODUCTION

Magtorx's current regulated programmable Digital Power Supply (DPS) is a digitally controlled device designed for high performance and high accuracy. The current regulation accuracy is lower than 1% at full-scale range. For higher accuracy see the Forced Air Cooled DPS. The toroidal transformer, used for the product has very low inductance leakage and excellent regulation, therefore, offering exceptional efficiency. The EO-120 model offers programming capability for an extensive range of medical and industrial applications. Magtorx's programmable DPS can be remotely controlled from a PC either manually or in auto-mode. A user can write software for controlling the power supply using a commercially available software development package such as NI LabView®, MatLab®, Visual C++®, Visual Basic® or even Hyper Terminal - see the Programming Examples and software section for programming capability. For use with electromagnetic brakes and clutches refer to the manufacturer's Cross Reference List of the Electromagnetic Particles, Hysteresis and Friction Brakes and Clutches.

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The Test Bench type Programmable Current Regulated Digital Power Supply (DPS) is useful for laboratory use in product development and testing.

Notes:

¹ The Absolute Max. Power is approx. 15 to 25% greater than the Rated Power. This is to ensure that the power supply will continuously operate with its high accuracy at rated current even when inductive or resistive load increases up to 15 to 25%. This is useful for operations that require good current regulation for stable performance.

² When connected to a low-voltage power line, the power supply may not produce rated dc output voltage. Power supplies tend to overheat when subjected to a high voltage power line.

³ Free Air Convection - The most important requirement for cooling a power supply is to provide proper air flow. To prevent damage to the power supply, exercise caution with the operation temperature.

⁴ Peak current rating is about 20% higher for 10 minutes operation at ambient temperature of 21ºC.

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SPECIFICATION

Ratings

P.S. Model No.	Rated Voltage [Vdc]	Rated Current⁴ [A]	Rated Power [W]	Absolute Power¹ [W]	Absolute Min. load [Ohm]
06-EO-120	6 V	0-6.30A	38 W	48 W	.95
12-EO-120	12 V	0-3.20A	38 W	48 W	3.75
24-EO-120	24 V	0-1.60A	38 W	48 W	15.0
30-EO-120	30 V	0-1.30A	38 W	48 W	23.0
48-EO-120	48 V	0-0.80A	38 W	48 W	60.0
60-EO-120	60 V	0-0.65A	39 W	48 W	92.0
90-EO-120	90 V	0-0.45A	41 W	48 W	200.0

Technical Data

Current output range	See table above
Current regulation	1 % of full scale range or better. (most models test results are between .5 and 1%)
Control input	RS-232; analog 0-5 Vdc; control knob (encoder). The RS-232 interface allows complete control with a standard PC RS-232 serial port, eliminating the requirement for any additional PC I/O cards for communicating with the power supply. Note: In case RS232 serial port is not available use ATEN USB to Serial Bridge Adapter.
Cooling	Free Air Convection
Circuit overload protection	Equipped with electronic Short-Circuit and Overload Protection
Line fuse	0.8 amps slow acting fuse
Input Ratings²	110 to 125 Vac/60 Hz
Toroid transformer	Low leakage inductance, excellent regulation, exceptional efficiency
Dimensions	7.00” W x 9.00” L x 2.70” H (178x229x69 mm)
Weight	4.4 lbs (2.0 kg)
Operation temperature³	rated for 0°C to 60°C temperature range - retains full performance. De-rates maximum output power by 2.5% per degree C above 60ºC.
Storage (environmental): temperature/ humidity	-20°C to 80°C@ max.; 90% RH not condensing

Current Scaling Capability

This feature is an electronic adjustment of the control signal to the desired current.

Example: if the maximum brake current requirement is 600mA, the maximum Control Signal of 5Vdc can be scaled to 600mA. In other words, if the DPS’ maximum current output is 1800mA, the Control Signal level for 600mA without scaling would be 1.667V. After scaling, the maximum Control Signal of 5 Vdc is available for 600 mA. The reason for this feature is to ensure that the highest possible resolution of the Control Signal can be assigned to the full scale of controlled current.

To perform Current Scaling manually, see the Front Panel description, pt.4. – “Current Scaling Setting”.

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Table and Programming Capabilities

The Programmable DPS combines control and power source together and allows the user to program the device and execute the program - see the attached diagram.

Example: The proportional input 0 to 5 Vdc (as shown on the “INPUT” graph) can control the current output (shown on the “OUTPUT” graph) which can be raised up or down proportionally, exponentially or any desired way. The output current can be created in any line form which can have over 4000 data points. This programming feature is also useful for Performance Matching (see also software).

Table - Magtorx DPS permits for programming the "Table", where the current output is altered to the specific process requirements. The data of Control Volt vs. Current is stored in the device memory - the Table. So, the applied current to the load is provided from the Table data. The Table is the dedicated portion of the DPS’ processor memory where the control signal vs. current data is stored. The data from the Table is retrieved when the DPS is operating in the Table Mode. If the process requires a defined Control Signal vs. Current profile, the Table is the place where this data can be stored. Magtorx DPS’ permit programming the Table where the output current is customized to the specific process requirements. See also: table mode, manual mode and PC Mode Operation.

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DPS – FRONT AND BACK PANEL DESCRIPTION

The Front Panel

1. DISPLAY – shows the drawn current in milliamps (mA), percent of full scale of current; control voltage in volts (Vdc), percentage of full scale of available control voltage, and the number of Program Iterations.

2. ON/OFF switch – used for turning “On” and “Off” the DPS device and for resetting a program when the device is in Program Mode.

3. ADJUST knob – used for manual adjustment of current or control voltage. When the adjusting knob is turned slowly, the regulation is adjusted in slow increments. When the adjustment knob is turned rapidly the regulation will adjust quicker.

4. CURRENT pushbutton – press the button to switch from displaying the current to displaying the percentage of full scale current. The LED located directly over the pushbuttons will change color from green to red.

Note: In order to set scaling, the inductive or resistive load must be connected to the LOAD Terminal (4) located on the DPS Back Panel:

Current Scaling Setting

· Press the CURRENT pushbutton and hold until the LED color changes to orange.

· Release the CURRENT pushbutton and rotate the ADJUST knob in a clockwise direction until a new full scale of current is set.

· Press the CURRENT pushbutton again to save the new setting. The next time the DPS device is turned “ON”, the display will retain the new full-scale of current.

· Resetting to full-scale - press the CURRENT pushbutton and hold until the LED color changes to orange. Press the pushbutton again to save the new setting. The next time the DPS device is turned “ON”, the display will return to full-scale of current.

The initial factory scaling is assigned based on the DPS rated current – see Product list for DPS specifications. Reset can be also performed in the PC Mode. Command I0FFF[CR] will reset the DPS scaling register to the initial factory setting. For more information see programming section.
5.     CONTROL VOLTAGE pushbutton (CTRL. VOLT) - press the button to switch from displaying the control voltage to displaying the percentage of control voltage. The button is also used for saving the default display (current, % of current, control voltage, or % control voltage). The LED located directly over the pushbuttons will change color from green to red. To save the settings, press and hold the CTRL VOLT pushbutton until the LED changes color to orange. The next time the DPS device is turned “ON”, the display will retain the enlisted settings. This includes either displaying the current, % of full scale of current, control voltage, or % of available control voltage – it depends which setting was displayed last, before it was saved. The other accessible setting assortment is a selection of either Table Mode or Manual Mode operation.
Note:   To execute a program on the Master Controller, the PROGRAM pushbutton must be manually pressed and held (see PRGRM pushbutton description below).
6.     PROGRAM pushbutton (PRGRM) - allows for the selection of the DPS operation. That is the: Manual Mode, Table Mode, or Program Mode. Press the PROGRAM pushbutton momentarily to switch between Manual and Table Mode. Press and hold the pushbutton to switch the Program Mode.
A green LED indicates Manual Mode operation. In Manual Mode the current is always proportional to the control signal. The control over the applied current is carried out manually by the ADJUST control knob, or 0 to 5Vdc serial port.
A red LED indicates Table Mode operation. In the Table Mode the output current is altered to a specific process requirement. The data of control volt vs. current is stored in the device memory - the Table. Therefore, the applied current to a load comes from the table data. Control can be applied either manually by the ADJUST control knob, 0 to 5Vdc, or the RS-232 serial port. The Table Mode operation is useful for Master-Slave applications. In this case the DPS device operates as a Slave which is managed by the Master Controller DPS. The Master Controller calls for data stored in a Slave device table and commands the Slave to act accordingly.
An orange LED indicates Program Mode operation. In the Program Mode, the DPS device operates as a Master Controller and manual control of the device is not possible. However, the following actions are allowed during Program Mode operation:
To pause the program operation in motion, press the PROGRAM pushbutton once. This will hold the program operation.
To restore the program operation press and hold the PROGRAM pushbutton until the LED changes to orange. The orange color indicates that the program operation is restored.
To re-start the program operation from beginning, turn “OFF” the ON/OFF switch, wait several seconds and turn “ON” the switch again. Then, press and hold the PROGRAM pushbutton until the LED changes to orange. The orange color indicates that the program re-started.
During the Program Mode the following displays can be viewed: drawn current in milliamps (mA), percent of full scale of current; control voltage in volts (Vdc), percentage of full scale of available control voltage, and the Program Iteration number. To view the Program Iteration number, turn the ADJUST knob clockwise to display the lower 4 digits of the iteration loops, then turn the ADJUST knob counterclockwise to display the higher 4 digits of the iteration loops. The total number of cycles should be read as a combined number of the higher and lower four digits. Example: if the display of the higher 4 digits shows number 0013, and the lower 4 digits number 2435, the total number of cycle is 132,435.

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The Back Panel

1.     Power Entry Module – operation voltage 120 Vac (USA) and 240 Vac (other countries). The bottom portion of the power module contains the “Slow Action Fuse”.
2.   0 to 5 Vdc Port - DC external voltage control. Allows for the remote control of the DPS device by analog voltage signal. The port will accept a Mono or Stereo Plug.
When the Mono Plug is utilized, control over the device is automatically switched to a 0 to 5Vdc analog signal.
When the Stereo Plug is utilized, control over the device (0 to 5Vdc) is possible after connection 7 is connected to connection 5 (Gnd) – see below. The Stereo Plug is used for remote voltage control where "ON-OFF" action is needed.

3. RS-232 Serial Port - supplied for programming and digital control of the DPS device.

Pin connection description:

Pin 2 – TxData from DPS
Pin 3 – RxData to DPS
Pin 5 – Ground (GND)
4.     LOAD Terminal – supplied for resistive or inductive load. Each DPS model is limited to a minimum load resistance - see DPS Absolute Min. Load.
5.     Gnd - Ground.
6.     Control Voltage connection.
7.     Connection used for external control ON/OFF of the 0-5 Vdc - analog Control Signal. If connection 7 is connected to Connection 5 (Gnd) then a 0 to 5 Vdc Control Signal is activated. Application example: Switch pedal will activate the control signal.

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Copyright © 2004 [MAGTORX]. All rights reserved. Rev. 1.1

PROGRAMMABLE DIGITAL POWER SUPPLY - FREE AIR COOLING

Ratings

Technical Data

The Front Panel

The Back Panel

3. RS-232 Serial Port - supplied for programming and digital control of the DPS device.

Pin connection description:

Pin 2 – TxData from DPS

Pin 3 – RxData to DPS

Pin 5 – Ground (GND)

5. Gnd - Ground.

6. Control Voltage connection.

7. Connection used for external control ON/OFF of the 0-5 Vdc - analog Control Signal. If connection 7 is connected to Connection 5 (Gnd) then a 0 to 5 Vdc Control Signal is activated. Application example: Switch pedal will activate the control signal.

Copyright © 2004 [MAGTORX]. All rights reserved. Rev. 1.1