PROGRAMMABLE DIGITAL POWER SUPPLY - OPEN FRAME

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. Magtorx's toroidal transformer, has very low inductance leakage and excellent regulation, therefore, offering excellent efficiency. This model offers programming capability for an extensive range of OEM applications. Magtorx's programmable DPS can also be remotely controlled from a PC either manually or in an auto-mode. A user can write software routines for controlling the power supply or use a commercially available software development package such as NI LabVIEW™. See the software section for programming capability. Magtorx's DPS can be remotely controlled by the 0 to 5 Vdc control signal or ten turns 5 kohms potentiometer - PN.5010014. For display and other components see Product Accessories. 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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Programmable Open Frame (DPS-OF)

The Open Frame (OF) Programmable Current Regulated Programmable DPS is useful for OEM use as a controller for Master-Slave Applications and for a wide range of life testing applications.

NOTE: IF THE DPS-OF IS USED AS A MASTER CONTROLLER IN THE MASTER-SLAVE APPLICATION IT MUST BE USED WITH DISPLAY PN.0020501. SLAVE DOES NOT REQUIRE THE DISPLAY.

Notes:

¹ The Absolute Max. Power is approx. 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 25%. This is useful for operations of electromechanical brakes and clutches 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.

SPECIFICATION

Ratings

P.S. Model No.	Rated Voltage [Vdc]	Rated Current [A]	Rated Power [W]	Absolute Power¹ [W]	Absolute Min. load [Ohm]
06-OP-120	6 V	0-7.50 A	45 W	60 W	0.85
12-OP-120	12 V	0-3.90 A	47 W	60 W	3.0
24-OP-120	24 V	0-2.00 A	48 W	60 W	12.0
30-OP-120	30 V	0-1.60 A	48 W	60 W	18.5
48-OP-120	48 V	0-1.00 A	48 W	60 W	48.0
60-OP-120	60 V	0-0.75 A	45 W	60 W	80.0
90-OP-120	90 V	0-0.50 A	45 W	60 W	180.0

Technical Data

Current output range	See table above
Current regulation	1 % of full scale range or better. (most models test results are between ½ 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	3.2 lbs (1.45 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

For use with electromagnetic brakes and clutches refer to manufacturers Cross Reference List of Electromagnetic Particles, Hysteresis and Friction Brakes and Clutches.

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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 below section DPS Connection and Dimensions, Pt. 5.

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Current Scaling Capability

Table and the 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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Table and the Programming Capabilities

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DPS Connections and Dimensions
1.   Programming and communication with a PC - use RS-232 cable adapter PN.0020505 - see above drawing for connection. If the display PN.0020501 is present, connect the cable adapter to the J4 connector located on the back side of the display. You can also connect terminal 6 directly to ground, terminal 9 (RxDATA232) to TxRS232 on the PC side and terminal 10 (TxDATA232) to RxRS232 on the PC side.
2.   Controlling with external voltage control - connect 0 to 5 Vdc to terminal 4.
3.   Controlling current with the potentiometer - connect 5k potentiometer to terminal 3 - GND & 4 Control (Wiper). The 5 Vdc must be provided by the external source. Terminal 11 can be used as a control voltage source. However, voltage must be reduced to 5Vdc. If the display PN.0020501 is present the potentiometer is not needed since the display PN.0020501 is equipped with a digital encoder - see display specification for more information.
4.   Constant current operation - attach load to terminals 1 & 2, bridge terminals 4 & 5, then adjust trimmer R10 to the desired current.
5.   Current scaling – attach load to terminals 1 & 2 then adjust trimmer R10 to the desired maximum current level. If the display PN.0020501 is present see the display specification for current scaling from the display side.
6.   Display connections - connect display - DPS terminals respectively as follows: 6-6, 7-7, 8-8, 9-9, 10-10, & 11-11. For more information see display specification.
7.   Connections for matching applications - If the DPS is used as a matched power source, terminals 7 & 8 must be bridged when the external control signal (0 to 5 Vdc) or RS-232 is used for controlling from a common control source.

DPS - terminals describtion

Programmable DPS mounting and overal dimensions

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PROGRAMMABLE DIGITAL POWER SUPPLY - OPEN FRAME

Ratings

Technical Data

2. Controlling with external voltage control - connect 0 to 5 Vdc to terminal 4.

4. Constant current operation - attach load to terminals 1 & 2, bridge terminals 4 & 5, then adjust trimmer R10 to the desired current.

5. Current scaling – attach load to terminals 1 & 2 then adjust trimmer R10 to the desired maximum current level. If the display PN.0020501 is present see the display specification for current scaling from the display side.

6. Display connections - connect display - DPS terminals respectively as follows: 6-6, 7-7, 8-8, 9-9, 10-10, & 11-11. For more information see display specification.

7. Connections for matching applications - If the DPS is used as a matched power source, terminals 7 & 8 must be bridged when the external control signal (0 to 5 Vdc) or RS-232 is used for controlling from a common control source.

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