Comptus A70-DL0, Инструкция по эксплуатации

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16
TROUBLE SHOOTING
INCORRECT DIRECTION INDICATION
Check the response with wind vane orientations
of North, South, East and West. The Northern
orientation is produced when the vane is aligned
with the mark on the edge of the housing.
If the output is correct for the Southern orienta-
tion, but incorrect for East and West, then the
positive and negative excitation terminals are
interchanged.
If the output signal is active for only half of the
range, then the signal terminal and one of the
excitation terminals are interchanged.
If the output constantly indicates just West of
North, then the negative excitation connection is
open or the signal terminal is short circuited to
the positive excitation terminal.
If the output is constantly just East of North then
the positive excitation terminal is open or the
signal terminal is short-circuited to the negative
excitation terminal.
Loop Current Failure Description
0 ma (constant): Current loop polarity re-
versed
Open circuit in cable
Power supply failure
4 ma (constant): Open in Positive or Signal
wire connecting wind vane to transmitter
Wind vane potentiometer open
20 ma (constant): Open in Negative wire
connecting wind vane to transmitter
Less than 4 ma: Low power supply voltage
Loop resistance too high
Greater than 20: Short circuit in cable
Does Not Reach Low power supply voltage
20 ma, otherwise Loop resistance too high
operates properly:
Output Jumpy: Input & output cables interchanged