TROUBLESHOOTING
Page B6-1
B6 TROUBLESHOOTING STATION TRANSFER
In order to transfer command from one Remote Station to another,
the following must occur:
•
T he re m ust be a val i d “Com m a nd Signa l ” at th e Stat io n bei ng
transferred to.
• The “Command Signal” must indicate that the Control Head’s
lever(s) is at the Neutral/Idle position.
• The Transfer Button mus t be depressed which takes the “Station
Select” signal from 5.00 VDC to 0.00 VDC.
If a transfer from one Remote Station to another is requested, but
does not take place; the items required for successful transfer can
be tested as follows:
B6-1 C
OMMAND
S
IGNAL
The Command Signal is a DC voltage which varies in relationship
to the Control Head’s lever position.
The Processor provides each Control Head 5.00 +/- 0.20VDC,
which is referred to as the “Reference Voltage”.
The Reference Voltage is appl ied to a 5K Ohm Potentiometer in the
Control Head.
The potentiometer’s “Wiper” taps off a portion of the R eference
Voltage and sends it back to the Process or.
The amount of DC voltage which is tapped off, is dependant on the
position of the Control Head’s lever.
When the lever is fully Astern, a small portion of the Reference
Voltage is tapped off by the wiper, and therefore, the volt-
age is at its lowest point (approximatel y 0.80 VDC).
When the lever is pos itioned fully Ahead, a larger portion is tapped
off and the voltage is at its highest point (approximately
4.10 VDC).
B6-2
A
TO
D C
OUNTS
Since all the calculations within the control system are performed
digitally, thes e DC voltages are express ed as and converted to a dig-
ital rep resentation.
• The “Refer enc e Vol tage” (approximately 5.00 VDC) by which all
analog inputs are based, is represented as 1023 A/D (Analog to
Di g i tal) Co u nts .
• This allows for the possibility of a 1024 possible positions when 0
is included in the count.
• The value of the Command Voltage with the lever at the Neutral/
Idle position is 49- 51% of the Reference Vo ltage when measured
at the Station terminal block. The actual value read by the Proces-
sor is 2% b elow that value or 47% t o 49% of 1 023 A/D C ounts (485-
505 A/D).
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