J.P. Instruments EDM-700 Manuale
Pilot’s Guide
Engine Data Management
EDM-700
EDM-800
Copyright 2001 J.P. Instruments, Inc.
All Rights Reserved
J.P. INSTRUMENTS INC.
Information: P. O. Box 7033
Huntington Beach, CA 92646
Factory: 3185 B Airway
Costa Mesa, CA 92626
(714) 557-5434 Fax (714) 557-9840
www.jpinstruments.com
Printed in the United States of America Rev P 05/2001
Table of Contents
SECTION 1 - .............................................................INTRODUCTION
5
PRODUCT FEATURES ..........................................................................5
ENGINE DATA MANAGEMENT...............................................................5
BENEFITS OF PROPER MIXTURE CONTROL...............................................2
JPI PROBES ......................................................................................2
TEMPERATURE AND MIXTURE ..............................................................2
SECTION 2 - ............................................DISPLAYS AND CONTROLS
4
DISPLAYS.........................................................................................4
MODES ............................................................................................7
BUTTONS .........................................................................................8
PARAMETER SCAN—SYSTEMS WITHOUT FUEL FLOW OPTION .................. 10
SECTION 3 - ............................................OPERATING PROCEDURES
11
DIAGNOSTIC TESTING ON STARTUP AND DURING FLIGHT ......................... 11
MODES .......................................................................................... 11
AUTOMATIC MODE........................................................................... 11
MANUAL MODE............................................................................... 12
LEANFIND MODE—LEANING RICH OF PEAK.......................................... 12
LEANFIND PROCEDURE—GENERAL EXPLANATION................................. 15
OPERATION FOR EACH PHASE OF FLIGHT .............................................. 20
SHOCK COOLING ............................................................................. 21
COMMON MISAPPLICATIONS.............................................................. 22
SECTION 4 - ................................DIAGNOSING ENGINE PROBLEMS
23
ALARMS ........................................................................................ 27
PRE-IGNITION AND DETONATION ........................................................ 28
SECTION 5 - .............................................................DATA LOGGING
29
SECTION 6 - .................................FUEL FLOW OPTION OPERATION
30
FUEL FLOW DISPLAY SELECT SWITCH ................................................. 30
FUEL MANAGEMENT ........................................................................ 32
PARAMETER SCAN—SYSTEMS WITH FUEL FLOW OPTION........................ 32
For Your Safe Flight Page 3
PARAMETER START UP SEQUENCE WITH FUEL FLOW OPTION................... 33
SECTION 7 - ........................................LONG TERM DATA MEMORY
35
SECTION 8 - ............................................................PERSONALIZING
39
PILOT PROGRAMMING....................................................................... 39
SECTION 9 -PROGRAMMING THE EDM-800 HORSEPOWER
CONSTANT ..................................................................................... 41
SECTION 10 - PROGRAMMING MANIFOLD PRESSURE (MAP) ...... 42
SECTION 11 - PROGRAMMING USE OF FACTORY ORIGINAL TIT
PROBE 43
SECTION 12 - PROGRAMMING THE FUEL FLOW OPTION ............ 44
FUEL FLOW OPTION PROGRAMMING PROCEDURE................................... 45
SECTION 13 - PROGRAMMING LONG TERM DATA MEMORY ...... 46
SECTION 14 - ALARM LIMITS ........................................................ 48
MAP, FUEL FLOW ALARM LIMITS, UNITS, FUEL CAPACITY ..................... 51
SECTION 15 - REAL-TIME SERIAL DATA PORT............................. 52
NAVIGATION DATA FORMATS............................................................. 54
SETTING GPS-C FUEL FLOW COMMUNICATIONS FORMAT ....................... 54
DIAGNOSTIC MESSAGES, FUEL FLOW .................................................. 55
NAVIGATION DATA PORTS FOR GPS COMM .......................................... 55
SECTION 16 - OPTION CONNECTOR PIN ASSIGNMENTS .............. 56
SECTION 17 - REFERENCE READING ............................................ 57
SECTION 18 - TECHNICAL SUPPORT ............................................. 57
LIMITED WARRANTY.................................................................... 58
INDEX............................................................................................. 59
How to Change Modes (page 7)
EDM-700 enters Automatic mode two minutes after power up
For Your Safe Flight Page 5
Section 1 -Introduction
Product Features
EDM 700/800 Standard Instrument:
•Hands-free, automatic scanning
•All programming done from the
Front Panel
•LeanFindfinds the first and last
cylinder to peak with true peak
detect—eliminating a false peak
detection. Displays both leaned
temperature below peak and peak
•Battery voltage with alarm
•24 Programmable alarm limits
•Normalize view
•DIF low to high EGT with alarm
•RS-232 Output for data logging in
real time
•Oil temperature option
•EGTs to stable 1°F resolution
•Shock cooling monitored on every
cylinder
•User selectable index rate
•Fast response probes
Fuel Flow Option:
•Solid-state pulse generating rotor
fuel flow transducer
•Fuel quantity measured in gallons,
kilograms, liters, or pounds
•Low fuel quantity alarm
•Low fuel time alarm
•GPS interface
•Instantaneous fuel flow rate
•Total amount of fuel consumed
•Total fuel remaining
•Time to empty at the current fuel
flow rate
Long Term Data Memory:
•Records and stores data up to 30
hours
•Non-volatile memory
•Post-flight data retrieval
•Download to Palm™ Computer
•Data retrieval software
EDM-800 %HP, MAP and RPM:
•Displays % horsepower and RPM
•Automatically calculates percent
horsepower
Engine Data Management
The EDM Engine Data Management system is the most advanced and
accurate piston engine-monitoring instrument on the market. Using the
latest microprocessor technology, the EDM will monitor up to twenty-
four critical parameters in your engine, four times a second, with a
linearized thermocouple accuracy of better than 0.1 percent or 2 F°.
As your built-in flight engineer, the EDM is constantly “red line”
checking: all critical parameters are automatically checked four times a
second, regardless of the current display status. Leaning is accomplished
quickly and automatically using the LeanFindprocedure. With the
Page 2 Engine Data Management
EDM it is now possible to have substantially more diagnostic
information available to you in a timely and usable manner.
The real-time serial data port—a standard feature—permits you to record
scanned parameters in real-time using a user-supplied Palm™ Computer
or laptop PC.
Benefits of Proper Mixture Control
•Improved engine efficiency •Reduced maintenance costs
•Greater fuel economy •Reduced operating costs
•Smoother engine operation •Proper engine temperatures
•Longer spark plug life •Reduced engine vibration
JPI Probes
Temperature
information
processed by the
EDM is captured
by fast response,
grounded JPI
temperature
probes, that
accurately
measure the
small temperature changes—as small as 1°F—that occur during mixture
adjustment.
Temperature and Mixture
In a piston engine only a small portion of the energy from combustion
produces movement of the piston during the power stroke. The majority
of energy passes into the exhaust pipe as hot gasses. By monitoring the
temperature of these exhaust gasses you will have an indication of the
quality of the combustion process. Low compression, non-uniform fuel
distribution, faulty ignition, and clogged injectors diminish the efficiency
of the combustion process that generates power.
From the cockpit you can adjust the fuel/air ratio by a process called
leaning. Retarding the mixture control changes the fuel/air ratio and
hence the resulting Exhaust Gas Temperature (EGT).
The following figure depicts the mixture and temperature relationship.
For Your Safe Flight Page 3
As the mixture is leaned, EGT rises to a peak temperature, and then
drops as the mixture is further leaned. Peak power occurs at a mixture
using more fuel than at peak EGT. Best economy occurs at peak EGT.
Accurate leaning yields optimal engine temperatures. By being able to
precisely adjust the mixture, your engine can produce either the best fuel
economy or maximum power, whichever you choose.
A single EGT gauge merely gives you an average of each cylinder’s
temperature: some cylinders can be too rich, while others too lean.
Variations produced by differences in fuel distribution, ignition, and
Page 4 Engine Data Management
compression will cause each cylinder to follow its own mixture and
temperature relationship such that one cylinder will reach peak before
another.
Section 2 -Displays and Controls
The EDM monitors engine temperatures and voltages, assists in adjusting
the fuel/air mixture, and helps diagnose engine malfunctions. There are
three components of the user interface:
•Analog display including cylinder number and index dot
•Digital display for numeric readouts and messages
•Two front panel operating buttons.
Displays
Analog Display
The upper half of the face of the EDM is the analog display with %HP.
The following is a description of the analog display, from top to bottom.
Numbers in circles refer to features in the above diagram.
For Your Safe Flight Page 5
•Normalize and Percentage View Indicators
•Percentage view: when there is a dash — near the Pat the top of
the display (EDM-700) or NRM is not lighted (EDM-800), the
columns indicate percent of EGT red line. Each column is
composed of a stack of segments. A maximum height column
depicts 100 % of red line and a one segment-high column depicts
50 % of red line. For example, if the red line is 1650°F, a
maximum height column represents 1650°F and a one segment-
high column represents half that value, or 825°F. The
Percentage view permits comparison of EGTs across all
cylinders. Hotter cylinders display higher columns than cooler
cylinders.
•Normalize view: when there is a dash _ near the Nat the top of
the display (EDM-700) or the letters NRM are lighted on the left
side (EDM-800), the EGT columns are displayed normalized.
When you change to the Normalize view, all column peaks are
set to the same half-height level for trend analysis. Any changes
are shown as an increase or decrease in column height. A one-
segment change in column height represents a 10°F change.
The Normalize view permits rapid visualization of EGT trends,
rather than a percentage of red line. You should use normalize in
level cruise and run-up.
To toggle between Percentage and the Normalize views, hold the LF
button for five seconds until the display changes. The analog display
becomes half height and the display changes to the Normalize view.
Selecting the Normalize view does not affect the digital display nor alter
the parameter sequence. The CHT display—described later—is not
affected by the Normalize or Percentage view.
You may select the Normalize view in either the Manual or Automatic
mode. Normalize view is most helpful for engine trend monitoring of
each cylinder’s operation. For example using the Normalize view during
engine run-up, a fouled spark plug will appear as a higher column.
A common misapplication is to be in the Normalize view and then
change your power setting, causing all columns to go off scale, high or
low. Set to the Percentage view before adding or reducing power.
Always set Percentage View when beginning your descent.
Page 6 Engine Data Management
‚Temperature Units (°F or °C)
•°F temperatures in the digital display are in Fahrenheit degrees.
•°C temperatures in the digital display are in Celsius degrees.
To change the display of engine temperatures see “Changing the
Alarm Limits” on page 45.
ƒ„Cylinder Numbers and Dot Index
A row of numbers 1through 6and the letter Tare the column labels for
the analog display. The 1through 6are the cylinder numbers. If the TIT
option is installed, the Tdenotes the last column is displaying Turbine
Input Temperature (TIT) as a column. If the Tis absent and the Oil
temperature option is installed, the last column displays Oil temperature.
If both TIT and Oil temperature options are installed, the last column
displays TIT and the missing segment displays Oil temperature. The
highest Oil temperature segment will flash only when the digital display
shows OIL. The highest TIT segment will flash on when the digital
display shows TIT. A round dot under the numbers 1 through 6 indicates
that particular column is shown numerically in the EGT and CHT digital
display.
…†Bar Graph EGT and CHT
Each column in the bar graph is composed of a stack of segments. The
total height of each column represents the EGT and the missing segment
in the column represents the CHT.
•In the Percentage view, the EGT, TIT, and Oil temperature
resolutions depend on the programmed red line limits.
•CHT is displayed by a missing segment and should be
interpreted as follows: a missing segment corresponds to the
CHT in 25 F° increments, starting at 300°F at the bottom. In
the example shown here, the CHT is 400°F. If the EGT bar
is lower than the missing CHT segment, then the CHT will
be indicated by a single isolated lighted segment.
The CHT display is the not affected by mode or view.
‡Percent HP or RPM (EDM-800 only)
Displays percent of rated HP or RPM depending on pilot programming.
Digital Display
Beneath the bar graph is the 9-segment alphanumeric display.
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