Specifications
Chapter 2 TECHNICAL SPECIFICATIONS
2.1 GENERAL INFORMATION COMMON TO THE 3 SERIES
. Supply voltage
:
+10 % -15 % of the nominal voltage
. Residual load current in locked status : <30 mA
Heat dissipation
Each unit dissipates a maximum of 1.3 W per amp issued.
This dissipation induces a rise in the ambient temperature if the units are mounted in
cabinets.
It is essential to check that the external ambient temperature of the cabinet does not
exceed 50°. Otherwise, provide a fan cooling system.
If this system includes dust removal filters, systematically perform a preventive
cleaning operation every 3 or 6 months depending on the degree of pollution.
Operating temperature: 0°C to 50°C with radiator in vertical position
Storage temperature: -10°C to + 70°C.
Unit cooling
The heat dissipation of the thyristors induces an overheating of the heatsink on which
they are mounted.
Two types of cooling are provided:
- by convection cooling
7
V 4
c
o,t,
7
/
S 4 - - CL-
- by fan cooling.
3
/ 4 c o p v l u , 6 1 / 0 7,C,V
•
15
to 75 A nominal units:
cooling by convection cooling.
• 100 to
150
A nominal units:
cooling by fan cooling.
In this case, the unit is equipped with a temperature safety switch which inhibits
thyristor firing in the event of overheating.
2-2
451-461 User Manual
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