Transmille 1000-Series - Manual (Page 70)

1000 SERIES OPERATION MANUAL
TRANSMILLE LTD. Version 1.30 Page 70
High Voltage Current Limit
The 1000 Series is fitted with the same high voltage current limiting circuitry as the
3000A Series Calibrator. This circuit consists of completely independent circuit that
monitors the current flowing in the high voltage section of the instrument. A fast
acting Triac is used so that in the event of too much current being drawn from the
high voltage output, the output is cut off immediately. This part of the circuitry is
NOT processor controlled, meaning in the event of a processor crash due to a high
voltage spark the trip circuitry will not be affected
10 Amp Temperature Cut-out
The 1000 Series calibrators are capable of supplying high currents for a limited
period. The calibrator will then enter standby and turn off the output. The output
amplifier operating temperature is monitored by the micro controller which will shut
down the output if required. The time before shut down occurs will vary depending
on the set output current and the load but is typically 60 to 90 seconds at 10A,
depending upon the load that is being driven. During this shutdown period, the
calibrator will be set to standby with a warning message shown on the display. It is
safe to reselect the output at any time as the microprocessor will automatically
protect the output amplifier from damage.