Marvair MAR7000, Лист данных продукта

Страница: 18 / 22

MAR7000 18 1/2013, P/N 01757 Rev. B
Display Freezes (Buttons Have No Effect)
• Carefully remove the MAR7000 cover from
the backplate and ensure the WD (watch dog)
jumper is installed on the two pins toward the
center of the board. The jumper is temporarily
removed during a firmware installation/
update and should be reinstalled when the
process is completed. Reinstalling the cover on
the backplate will restart the MAR7000.
Display Keeps Resetting
• Carefully remove the MAR7000 cover from
the backplate, check pins and connectors, and
reinsert. (See Cover Binds on Backplate on
page 17 .)
• Check for proper supply voltage from the
transformer and that the transformer has
enough capacity (VA) for all connected
devices. (See their respective specifications.)
NOTE: Wiring must be adequate to avoid
excessive voltage drop on long
runs! Allow plenty of “cushion” in
measurements A meter may be too
slow to register transient dips or peaks
during startup. See Wiring Issues on
page 20 .
• Put the MAR7000 on a backplate connected
to a (test) transformer with short wiring and
no other connected devices. If the MAR7000
works with the test transformer, the wiring
and/or transformer in its previous location is
inadequate. If it does not work with the test
transformer, replace the MAR7000.
• Put another MAR7000 on the installed
backplate, and if the second MAR7000
functions properly, replace the first MAR7000.
• Check that the correct input type is selected
on the Inputs screen. A Type III thermistor is
the default for external inputs. See (Advanced)
Inputs on page 12 .
• Check input wiring. See Wiring Issues on page
20 .
• Check connected sensors.
• Restore the MAR7000 to factory settings
(see Resetting the MAR7000 on page 21
)
and
reconfigure.
Motion/Occupancy Sensor Does Not Work
• After an initial power-up or restart, the
motion/occupancy sensor requires about 30
seconds before it will begin responding to
motion.
• The motion/occupancy sensor initiates
override only during “off” times in the
schedule. See Schedules on page 15 .
• Check that the motion sensor is enabled and
detects motion. See Motion Sensor on page 9 .
• The MAR7000 must be installed where there
is a clear view of typical traffic area (reliable
range is out to about 33 feet). Remove or move
obstacles. Reinstall the MAR7000 in a more
optimal location if necessary.
Temperature Reading Is Incorrect
• Check that the correct °F/°C temperature
scale is selected—see (Advanced) Application
Options on page 8 .
• After applying power for the first time (or
after an outage), allow the MAR7000 to self-
calibrate a few minutes before verifying
temperature reading.
• If the discrepancy is small, adjust the
calibration offset—see (Advanced) Inputs on
page 12 .
• Check that the MAR7000 is NOT mounted
on an exterior wall, mounted on or near
a large thermal mass (e.g., concrete block
wall), blocked from normal air circulation by
obstructions, exposed to heat sources (e.g.,
lights, computers, copiers, coffee makers) or to
sunlight (at any time of the day), exposed to
drafts from windows or air vents, or exposed
to air flow through the conduit from leaks
in plenum ducts (put plumber’s putty inside
conduit to block air leaks).
• See also Input Values Are Outside Expected
Range on page 18 .
Input, Sensor, and Value Issues
Input Values Are Outside Expected Range
• Check that ALL the input pull-up resistor
switches are fully latched in the correct
positions. (See Input Connections on page
5 .) A single incorrect switch position may
affect multiple inputs. All input switches
must be latched in either 10K Ohm or 0–12
VDC positions even if no input is connected!
Input switch pairs (3-4, 5-6, and 7-8) must
never have both switches set in the same
direction—if switch 3 is set to the left, for
example, 4 must be set to the right (or vice
versa).