1. Preface

Thank you for choosing a Magna-Power Electronics product. This document provides user, service, and programming information the ALx Series MagnaLOAD DC Electronic Load. If you have any suggestions or feedback for this document, please contact Magna-Power at feedback@magna-power.com.

1.1. Contact Magna-Power Electronics

Magna-Power support can be contacted for service, technical support, or spare parts:

Visit www.magna-power.com/support for more support resources and information about contacting Magna-Power worldwide.

1.2. Safety Notice

The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Neither Magna-Power Electronics nor any of the associated sales organizations can accept responsibility for personal injury, consequential injury, loss, or damage resulting from improper use of the equipment and accessories.

Installation and service must be performed only by properly trained and qualified personnel who are aware of dealing with electrical hazards. Ensure that the AC power line ground is properly connected to the MagnaLOAD chassis. Furthermore, other power grounds, including those connected to application maintenance equipment, must be grounded for both personnel and equipment safety.

This product is a Safety Class 1 instrument, provided with a protective earth terminal. The protective features of this product may be impaired if it is used in a manner not specified in the operation instructions.


Lethal voltages may be present inside the MagnaLOAD even when the AC input voltage is disconnected. Only properly trained and qualified personnel should remove covers and access the inside of the MagnaLOAD.

During normal operation, the operator does not have access to hazardous voltages within the product’s chassis. Depending on the application, high voltages hazardous to human safety may be present on the DC input terminals. Ensure that the DC input power cables are properly labeled as to the safety hazards and that any inadvertent contact with hazardous voltages is eliminated.

Do not install substitute parts or perform unauthorized maintenance on the product.

These operating instructions form an integral part of the equipment and must be available to the operating personnel at all times. All the safety instructions and advice notes are to be followed.

1.2.1. Safety Symbols

1.3. Limited Warranty

The following is made in lieu of all warranties expressed or implied.

Magna-Power Electronics, Inc. warranties its products to be free of manufacturing defects for a period of two years from date of original shipment from its factory. Magna-Power Electronics, Inc. will repair, replace, or refund the purchase price at its discretion, which upon examination by Magna-Power Electronics, Inc., is determined to be defective in material or workmanship, providing such claimed defective material is returned upon written authorization of Magna-Power Electronics, Inc., freight and duties prepaid.

For products failing within the first 30 days of the warranty period, Magna-Power Electronics, Inc. will return the repaired product at its expense using a standard ground shipping method; after 30 days of the warranty period, the repaired product will be returned at the customer’s expense using the customer’s requested shipping method.

Damage due to corrosion, customer alterations, excessive dust, extreme environmental or electrical conditions, and/or misuse will be evaluated upon inspection. If inspection reveals that the cause of damage is not due to materials or workmanship, repair of the product will be treated on a non-warranty basis.

All electrical, commercial supply parts, and items not manufactured by Magna-Power Electronics, Inc. shall carry the warranty of the original manufacturer and no more, but under no circumstances to exceed the warranty period. Replacement parts shall be warranted for a period of 90 days. Warranty labor shall only apply if the product, assembly, or part is returned to the factory freight prepaid and insured. Damage or breakage while in transit is not covered by this warranty.

Magna-Power Electronics, Inc. assumes no responsibility to Buyer for labor to diagnose and remove defective product and installation of replacement product. Furthermore, Magna-Power Electronics, Inc. is not liable to Buyer or to any third party for consequential or incidental damages under any circumstances, whether due to defect in the product, due to delay or failure of delivery, due to a failure of the product to perform as specified, or for any other reason or cause. Buyer and Magna-Power Electronics, Inc. agree that Buyer’s sole remedy and Magna-Power Electronics, Inc.’s sole liability to Buyer is limited to repair, replacement, or refund of the purchase price of the product as described herein, whether Buyer’s claim arises out of contract or in tort.

All claims against the warranty shall be the final determination of Magna-Power Electronics, Inc.

1.4. Declaration of Conformity

Magna-Power Electronics declares on its sole responsibility that the ALx Series MagnaLOAD DC Electronic Load is eligible to bear the CE Mark. The Declaration of Conformity is included on the calibration certificate with the original shipment all ALx Series products. An additional digital copy is available by clicking here.

1.5. Document Conventions

This user’s manual uses several conventions to highlight certain words and phrases and draw attention to specific pieces of information.

1.5.1. Notes and Warnings


Notes are tips, shortcuts or alternative approaches to the task at hand. Ignoring a note should have no negative consequences, but you might miss out on a time saving procedure.


The warning sign denotes a hazard, calling attention to a procedure or practice. If a warning is not correctly performed or adhered to, it could result in personal injury. Do not proceed beyond a warning sign until the conditions are fully understood or met.


The caution sign denotes a hazard, calling attention to a procedure or practice. If a caution is not correctly performed or adhered to, it could result in damage to the product. Do not proceed beyond a caution sign until the conditions are fully understood or met.

1.5.2. Text Conventions

Source-code listings are also set in mono-spaced roman but add syntax highlighting as follows:

# -*- coding: utf-8 -*-

from serial import Serial

class Magna(Serial):
def __init__(self, port, expected_serial_number=None, log=None):
        super(Magna, self).__init__(port, baudrate=19200, timeout=2.0)
        self.log = log if log else self.magna_log

1.6. Additional Help and Product Feedback

For additional help or to provide feedback about the product’s design and feature, please contact: support@magna-power.com.