QSEVEN-Q7ALx2 - Preliminary User Guide, Rev. 0.7
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Additional safety instructions for DC power supply circuits
To guarantee safe operation of products with DC power supply voltages larger than 60 volts DC or a power
consumption larger than 120 VA, observe that:
Product is set up, installed and operated in a room or enclosure marked with “RESTRICTED ACCESS”, if there
are no safety messages such as safety signs and labels on the product.
Do not touch either directly or indirectly, cables or parts without insulation in electrical circuits with
dangerous voltage or power.
Reliable protective earth connection is provided
Suitable, easily accessible disconnecting device is used in the application (e.g. overcurrent protective device),
if the product cannot be disconnected
A disconnect device, if provided in or as part of the equipment, must disconnect both poles simultaneously
Interconnecting power circuits of different devices cause no electrical hazards
A sufficient dimensioning of the power cable wires must be selected – according to the maximum electrical
specifications on the product label – as stipulated by applied safety standards.
The products do not generally fulfill the requirements for "centralized DC power systems“” as stipulated by the
applied safety standards and therefore may not be connected to such devices!
Electrostatic Discharge (ESD)
1.1.
A sudden discharge of electrostatic electricity can destroy static-sensitive devices.
Proper packaging and grounding techniques are necessary precautions to prevent damage. Always take the following
precautions:
1.
Transport ESD-sensitive products in ESD-safe containers such as boxes or bags.
2.
Keep electrostatic sensitive parts in their containers until they arrive at the ESD-safe workplace.
3.
Always be properly grounded when touching sensitive products, components, or assembly.
4.
Store ESD-sensitive products in protective packaging or on antistatic mats.
Grounding Methods
1.2.
To avoid electrostatic damage, observe the following grounding guidelines:
1.
Cover workstations with approved antistatic material. Always wear a wrist strap connected to the workplace.
Always use properly grounded tools and equipment.
2.
Use antistatic mats, heel straps, or air ionizers for more protection.
3.
Always handle electrostatically sensitive components by their edge or by their casing.
4.
Avoid contact with pins, leads, or circuitry.
5.
Switch off power and input signals before inserting and removing connectors or connecting test equipment.
6.
Keep work area free of non-conductive materials such as ordinary plastic assembly aids and Styrofoam.
7.
Use only field service tools that are conductive, such as cutters, screwdrivers, and vacuum cleaners.
8.
Always place drives and boards PCB-assembly-side down on the foam.
