BE1-50/51B
3
FUNCTIONAL DESCRIPTION, continued
Table 1 - Current Sensing Capabilities
Time Element Time Element
50/60 Hz System Time Element Max. Continuous Max. Current Instantaneous Time Element Instantaneous
CT Secondary Pickup Range Current For 1 Second Pickup Range Pickup Accuracy Pickup Accuracy
5 Amp 0.5 to 15.9 Amps 14 Amps 400 Amps 1 to 99 Amps 2% from 0.5 to 2% from 1 to 99 Amps
in 0.1 Amp Steps in 1 Amp Steps 15.9 Amps
1 Amp 0.1 to 3.18 Amps 2.8 Amps 80 Amps 0.2 to 19.8 Amps 2% from 0.1 to 2% from 0.2 to 19.8 Amps
in .02 Amp Steps in 0.2 Amp Steps 3.18 Amps
Operating power from the power supply is applied to
the microprocessor supervisor circuit. When the input
current falls below an acceptable level, the supervisor
circuit interrupts the microprocessor and halts further
operation.
Figure 1 - Functional Block Diagram
The watchdog timer monitors the microprocessor for
specific pulses indicating proper program operation. If
something occurs to disrupt the microprocessor, these
pulses stop, the watchdog timer times out and sends a
reset pulse to the microprocessor. The microprocessor
resets and resumes normal operation.
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