rev A
MNL-7178.docx
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4
C
OMMISSIONING
4.1
E
LECTRICAL
C
HECK
Ensure that the unit is properly installed and secured before
powering on the 7178.
•
Confirm that all electrical connections to the 7178 have been made.
•
Confirm that a breaker has been installed correctly and is turned ON.
4.2
C
ALIBRATION AND
A
DJUSTMENT
The indicator may need to be adjusted to correct the overall range of the meter to align with
the position of the rudder’s maximum travel
or the RFU may need to be adjusted to centre
the pointer.
Follow these instructions to configure the zero point and span using the on-board trimpots.
To reduce the potential for electrical shock and to avoid damaging
the 7178 electronics,
use a
non-conductive
screwdriver
, or other
equivalent tool, to adjust the trimpot.
Exercise caution when reaching in with the screwdriver. Do not let it
touch any components other than the trimpot.
Ensure no oil or other contamination enters the 7178 while its cover
is removed.
1.
Turn OFF power to the 7178 prior to making adjustment.
2.
Remove the bottom access panel.
3.
Use a
non-conductive
flathead screwdriver to make adjustments.
a.
Rotate trimpot clockwise to increase
b.
Rotate trimpot counterclockwise to decrease
4.
Turn ON power.
5.
Move rudder through its range to verify desired response.
6.
Repeat as necessary, until the 7178 functions as desired.
Default position for all configuration trimpots is at centre.
4.2.1
“ZERO” Trimpot:
Adjust Midpoint
Adjustments to the meter zero point, if required, must be made at the rudder feedback unit
(RFU). When the rudder is centered, adjust the feedback potentiometer to align the needle
with the midpoint marking.
