Installation
7100A User Manual
2-2
Chapter 2 installation
2.1. SAFETY DURING INSTALLATION (MOUNTING AND WIRING)
Danger!
• 7100A power thyristor units must be installed and wired by qualified staff authorised to
work on low voltage industrial electrical facilities.
• Units must be installed in a fan-cooled cabinet, to ensure that condensation and pollution
are excluded, with a class of at least 2 according to IEC 664.
We recommend fitting fan-cooled cabinets with a fan failure detection device or a thermal
safety cut-out.
The cabinet must be closed and connected to the protective earth according to IEC 60364
or applicable national standards.
• Units must be mounted with the heatsink positioned vertically, and with no obstructions
above or below the unit which could reduce or hamper air flow.
If several units are fitted in the same cabinet, arrange them such that air from one unit is
not drawn in by the unit above.
Leave a gap of at least 10 mm between adjacent units.
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Important!
• Nominal currents correspond to use at ambient temperatures of no more than 45°C.
Overheating may cause incorrect operation and may even lead to components being
damaged.
Danger!
• It is the user’s responsibility to wire and protect the facility according to best practice and
applicable standards.
A suitable device, ensuring that the unit can be electrically isolated from the supply, must
be installed upline to enable work to be performed safely.
Conductor cross-sections should comply with IEC 60943.
Only use copper cables and wires rated for use at 75°C.
• Before connecting or disconnecting the unit check that power and control cables and
leads are isolated from voltage sources.
The protective earth must be connected before any other connections are made and should
be the last cable to be disconnected.
The protective earth connection terminal is marked with the symbol
Important!
• To ensure that 7100A power thyristor units comply with Electromagnetic Compatibility
requirements, ensure that the panel or DIN rail to which they are attached is correctly
grounded.
The ground connection, designed to ensure
ground continuity,
is not in any way a
substitute for the protective earth connection.
!
!
71A2_Installation_ENG_Iss3.qxp 1/09/06 16:14 Page 2-2