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The system monitors up to 24 power semiconductors via fibre-optic
links for open-or short-circuit conditions, indicates overloads and
retains its memory until the fault is cleared. The unit may be operated
from 58 - 270V AC or DC (auto-selecting). LEDs indicate green for
healthy conditions and red in the event of a semiconductor failure. |
The remote interface module is used to reset the master display unit,
receive trip signals and to activate the memory function via fibre-optic
links. Direct copper connections may be used to the main display unit,
if preferred. |
The fibre-optic transmitter card fits directly across the semiconductor
being monitored and, since it derives its power from the main rectifier
circuit, requires no other power supply. |
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The rear panel is well-annunciated and is so designed that a single
faulty card may be removed without disturbing fibre-optic links to
other cards. A terminal block is accessible in the event that direct
copper cabling is preferred for the remote control module. |
The temperature sensor may be used at any voltage since it is completely
isolated by a fibre-optic link. An interface card allows adjustment
of hysteresis, temperature set-points and whether normally-open or
normally-closed operation is required. |
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The unit houses the switch-mode power supply card, I/O interface card,
load curve card and up to four 6-channel receiver cards. All cards
slide into the motherboard into shake-proof connectors and cannot
be reversed or incorrectly inserted. |
The 6-channel fibre-optic receiver card is designed to fail-to-safe
using retained relays at all critical points. This card communicates
status of the rectifier being monitored to the front panel display
and has a 1 second (or user adjustable) delay to eliminate premature
system tripping. |
