| Data Sheet Extract | Caledon | |
|
| SRC SERIES | THYRISTOR STACKS FOR BURST FIRE CONTROL OF RESISTIVE LOADS | ||
 |
|
||
 |
Space saving compact, slimline design | ||
|
Robust conservatively rated construction | ||
|
Current ratings from 63A to 800A | ||
|
Long life ball bearing fans | ||
|
Built in EMC filters | ||
|
Built in semiconductor fuses | ||
|
Logic or analogue control input options | ||
|
Fuse / Phase failure alarm output | ||
| SRC2000-315A (same size up to 800A) | SRC2000-125A (same size up to 200A) |
GENERAL DESCRIPTION
These thyristor stacks have been developed from our original SR range, first introduced in 1995. The SRs were followed in 1998 by the SRC2000 range, offering neater mechanical design, and more compact dimensions, but limited to 2-phase units with current ratings from 63A to 200A. We have now broadened the range to cover higher currents, and 1, 2 or 3-phase operation. A new analogue driver card is also available, which is powered from the 115 / 230V AC fan supply.
This is a modern range of thyristor stacks, specifically designed for burst fire control of resistive loads in medium and high current heating applications for furnace, ovens, dryers etc. These units use a proven MOSFET driver circuit, and feature closely controlled zero-voltage switch on, and low crossover commutation noise.
The standard input is a logic signal, but an optional analogue input driver card is available which accepts 0-5V, 1-5V, 0-10V (and 0-20mA, 4-20mA with a 250 ohm burden resistor).
The stacks have generously sized heatsinks and power semiconductors to ensure long term reliability. The power connections are to stud terminals, which are reliable at elevated temperatures, and under conditions of temperature cycling.
The line to line EMC filter capacitors ensure very low conducted emissions, and together with MOV and snubber protection, contribute to very high immunity to conducted interference.
The top and bottom removable mounting clips help simplify installation and subsequent removal for maintenance if desired. The covers enclose both power and signal connections to protect against accidental contact. The width of the units has been kept small to simplify side by side mounting in multi-zone applications.
