Datasheet

INTRODUCTION
The objective of this leaflet is to provide information to ensure that the safety of the person(s) installing or maintaining the
equipment is not jeopardised and its location and method of installation does not endanger others, during or after installation.
Customers should be aware of the Health and Safety at Work Act 1974 (HSW 1974) and the EC “Provision and Use of Work
Equipment Regulations 1992” (PUWER), both available from the Health and Safety Executive (HSE) publications, within the UK.
UNITED AUTOMATION LIMITED
1 Southport Business Park Tel [phone]
Southport, PR8 4HQ, U.K. Fax [phone]
Page No 1 of 1 Issue 1 15/07/97
SAFETY REQUIREMENTS
ADVICE SHEET
INSTALLATION
CE Directives
These are European regulations which are appropriate to our industry. They affect the equipment emissions and immunity to Radio
Frequency Interference (RFI) and various elements of safety for electrical equipment.
The European Community (EC) ‘CE’ Directives that mainly concern United Automation Limited (UAL) are the Low Voltage
Directive (LVD) and the Electromagnetic Compliance Directive (EMC). With further reference to appropriate European
Harmonised Standards, the Company opted for the self certification method of assessment to address the wide range and variety of
products supplied by United Automation Limited.
A Declaration of Conformity may be supplied with the product or supplied on request.
Cooling Requirements
United Automation Limited manufacture and use a wide range of discrete power semiconductors, which under load conditions,
may generate excessive heat. We therefore recommend some form of cooling, or additional cooling for high power rated products.
The use of an additional heatsink (this could be a conductive panel) suitably attached or mounted with the unit, will help to dissipate
heat away from the device(s). An alternative or additional method would be forced air cooling (using a fan), helping the natural
convection of air flow over an existing heatsink within the unit.
The equipment’s environment and its initial ambient temperature also need to be considered, as this could have an adverse effect to
the overall operating conditions.
Fusing
We recommend that semiconductor (fast acting to BS88 [IEC 269] ) type fuses or circuit breakers (Semiconductor - MCB) should
be used for unit and/or device protection. The appropriate maximum load current should be known to select the required SCR fuse
or MCB, but must not exceed the equipment rating. The I² t (A² s) rating of the selected fuse, must be less than that of the
equipment so as to protect the equipment’s discrete device. Further appropriate fusing may be required for protection of the unit
supply using standard fuse links and holders. Failure to address these requirements and use incorrectly selected fuses, may cause
the equipment to fail.
Earthing
The protective conductor terminal of the equipment must be utilised at all times and bonded to a ‘good’ Earth (ground). The earth
bonding (strapping) leads of any combined equipment should be as short as possible and be substantial (i.e. at least rated higher than
the equipment’s load). For further information refer to BS7671 (see MAINTENANCE below) Following these simple guidelines
will ensure optimum use of any appropriate filter circuits which may be required.
Insulation (overvoltage category) and Protection of electric shock Classification of Equipment
All equipment, unless otherwise stated, is rated to CLASS II Insulation (overvoltage category) and CLASS I Protection category.
For specific insulation test voltage ratings, see Equipment Datasheet.
MAINTENANCE
Electronic equipment has few mechanical moving parts and is therefore, inherently, very reliable. Before any servicing is carried
out, reference should be made to appropriate installation instructions, drawings and labelling which may come with the equipment.
Personnel should switch off the unit supply before accessing or removing a safety cover and be aware of ‘hazardous live’ parts.
We recommend that installation and maintenance of all United Automation Limited equipment should be done with reference to
the current edition of the I.E.E. wiring regulations (BS7671), by suitably qualified/trained personnel. The regulations contain
important requirements regarding safety of electrical equipment within the UK (For International Standards refer to I.E.C Directive
IEC 950).
SRA
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