J.P. Instruments EDM-730 Manual

For Your Safe Flight Page 1
Pilot’s Guide
Engine Data Management
EDM-730
EDM-830
EDM-740
EXPERIMENTAL
Copyright 2000-2010 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
PH: [phone]
PH: [phone]
FX: [phone]
www.jpinstruments.com
www.jpitech.com
[email protected]
Printed in the United States of America Rev C June 1 2010
Last printed 3/11/2011 8:44:00 AM

Page 2 Engine Data Management
Table of Contents
Section 1 - Introduction 5
Product Features 5
Engine Data Management 6
Benefits of Proper Mixture Control 6
JPI Probes 6
Temperature and Mixture 6
Displays and Controls 8
Typical EDM-830-6C Cylinder Display 8
Typical display configurations by model and mounting orientation 12
EDM-830 RPM and MAP Display 13
EDM-730/830 Linear Gauges 13
EDM-730/830 Basic Scanner® Operation 14
Operating Modes 15
Button Location and Display Rotation 16
Scanner® Information Area 19
Section 2 - Operating Procedures 20
Built-in Diagnostics: Startup and During Flight 20
EDM Modes 20
Automatic Mode 20
Manual Mode 21
LeanFind Mode 22
LeanFind Procedure—General Explanation 25
Expanded Leaning Procedures 28
Operation for each Phase of Flight 29
Shock Cooling 30
Common Misapplications 31
Section 3 - Diagnosing Engine Problems 32
Engine Diagnosis Chart 33
Alarms 35
Alarm Priority 36
Pre-Ignition and Detonation 36
Section 4 - Fuel Flow Option Operation 37
Fuel Management 37
Start Up Fuel 38
Resetting ‘USED’ 42
Accumulate — Trip Totalizer 42
Fuel Flow Display Select Switch 42
Parameter Scan—Systems with Fuel Flow Option 42
Section 5 - Long Term Data Memory 44
Downloading from Long Term Memory 44
Transferring from the USB Flash Drive to a PC 45

For Your Safe Flight Page 3
Section 6 - Personalizing 45
Pilot Programming 45
Section 7 - Programming Horsepower Constant 47
Section 8 - Programming Manifold Pressure (MAP) 47
Section 9 - Programming use of Factory Original TIT Probe 48
Section 10 - Programming the Fuel Flow Option 49
Section 11 - Programming Long Term Data Memory 51
Section 12 - Factory Limits and GPS 52
MAP, Fuel Flow Alarm Limits, Units, Fuel Capacity 55
Navigation GPS Data Formats 57
GPS-C Fuel Flow Format for GPS Bi-directional Comm 57
Navigation Data Ports for GPS Communication 58
Section 13 - Options Connector Pin Assignments 59
Section 14 - Display Customization 60
Section 15 - Reference Reading 61
Section 16 - Technical Support 61
Section 17 - Limited Warranty 62
Section 18 - EDM-851 TWIN ENGINE ADDENDUM 63
Section 19 - Index 64
QUICK REFERENCE GUIDE 68

Page 4 Engine Data Management
The following is a quick reference of basic operation
AUTO MODE:
parameters
automatically
indexed
Toggles to
include/exclude
parameter in
AUTO MODE
indexing
LEAN FIND:
starts LeanFind
procedure
Toggle between
LEAN R and
LEAN L of peak
Cylinder I.D.
box flashes
see
‘LeanFind
Mode’ for
details
Displays
peak EGT
value
tap STEP button
tap LF, then tap STEP
tap STEP and LF
simultaneously
release buttons
LF
LF
STEP
holdboth
STEPandLF
simultaneously
begin
leaning
continue
leaning
hold LF
release LF
MANUAL MODE:
Parameters
manually indexed
by tapping STEP

For Your Safe Flight Page 5
Section 1 - Introduction
Product Features
indicates standard feature 730 830
Hands-free, automatic scanning  
All programming done from the Front Panel  
LeanFindfinds the first and last cylinder to peak with
true peak detect—eliminates a false peaks
 
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  
EGTs to stable 1°F resolution  
Shock cooling monitored on every cylinder  
User selectable index rate  
Fast response probes  
Non-volatile long term memory  
Records and stores data up to 30 hours  
Post-flight data retrieval  
Data retrieval software  
Alarm and warning light outputs  
Oil temperature opt opt
Oil pressure opt opt
Turbine inlet temperature opt opt
Outside air temperature opt 
Compressor discharge temperature opt opt
Intercooler temperature opt opt
Carburetor temperature opt opt
Manifold Pressure (MAP) 
Fuel Flow FF opt 
Solid-state rotor fuel flow transducer FF opt 
Fuel quantity in gallons, kilograms, liters, or pounds FF opt 
Low fuel quantity alarm FF opt 
Low fuel time alarm FF opt 
GPS interface FF opt 
Instantaneous fuel flow rate FF opt 
Total amount of fuel consumed FF opt 
Total fuel remaining FF opt 
Time to empty at the current fuel flow rate FF opt 
Displays % horsepower and RPM RPM opt 
Automatically calculates percent horsepower
Requires FF, OAT, RPM, and MAP.


Page 6 Engine Data Management
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 LeanFindprocedure. With the
EDM, it is now possible to have substantially more diagnostic
information available to you in a timely and usable manner.
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 small temperature
changes—as small as 1°F—that
routinely 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 affects
the Exhaust Gas Temperature (EGT).
CHT probe
EGT probe
cylinder
head exhaust manifold

For Your Safe Flight Page 7
The following depicts the power, mixture and temperature relationships.
EGT °F below peak
Percent of best
power
CHT °F change from
best
power
Best
power
range
0
-
100
-
50
-
20
20
-
60
-
40
0
-
80
10
0
8
5
9
0
9
5
8
0
Percent
power
Specificfuel
consumption
Too
lean
Lean
Rich
Full Rich
(Take-off)
EGT
CHT
First cylinder to
peak. Use for ROP
Rich of Peak
leaning
Last cylinder to
peak. Use for LOP
Lean of Peak
leaning
Peak Power
Best
economy
range
GAMI
spread
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 a few cylinder’s
temperature: some cylinders can be too rich, while others too lean.
Variations produced by differences in fuel distribution, ignition, and
compression will cause each cylinder to peak at a different temperature.
In some cases the coldest cylinder will peak first. TIT will run up to 100
degrees hotter than the hottest EGT.

Page 8 Engine Data Management
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 cylinder I.D. box
Digital display for numeric readouts and messages
Two front panel operating buttons for simple operation.
Typical EDM-830-6C Cylinder Display
TIT
Bargraph
Linear gauges
monitor
numerous
parameters
CHT
absolute
scale
Temp in
°F or °C
Cyl Number identifies
bargraph cylinder.
Cyl I.D. Box identifies
the related Scanner
digital values
Cyl Bargraphs:
EGT left side,
CHT right side,
digital above
%HPEGT normalize
Scanner
Information
Area
8
9
7
6
5
4
3
2
1
Display Dimming
The display features automatic dimming. Allow ten seconds for the
display to adjust to ambient lighting conditions. The dimming baseline
can be user adjusted in Pilot Programming Mode.

For Your Safe Flight Page 9
The following is a description of various display areas. Numbers in
circles refer to features in the above diagram.
1Normalize View and Percentage View
Percentage View: when the EGT normalize indicator ‘NRM’is
not lit, the columns indicate percent of EGT red line. Each
column is composed of a stack of segments. A maximum height
column (all segments lit) depicts 100 %, or more, 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 the EGT normalize indicator ‘NRM’is
lit, the EGT columns are displayed normalized. When you
activate 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 View and Normalize View, hold the
LF button until the ‘NRM’ indicator either comes on or goes off.
Selecting the Normalize view does not affect the digital display nor alter
the parameter sequence. The CHT display—described later—is not
affected by either Normalize or Percentage view.
You may select the Normalize view in either the Manual or Automatic
modes, but not during Lean Find 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.
TIP: A common misapplication is to be in the Normalize view and then
change your power setting. This can cause all columns to go off scale,
high or low, giving you the impression there is a problem. Turn off
‘NRM’ (return to Percentage view) before adding or reducing power and
when beginning your descent.

Page 10 Engine Data Management
2Temperature Units (°F or °C)
The EDM series engine temps can be set for either degrees Fahrenheit
°F or degrees Celsius °C. Note: OAT units can be set independently of
the engine temps. To change the display of engine temperatures see
“Changing the Alarm Limits” on page 52.
3Cylinder Numbers and the Cylinder I.D. box
The row of numbers 1through 6(cylinder I.D numbers) and the letter
‘T’ (optional turbine inlet temp) are the column labels for the analog
display bargraphs. A square box (cylinder I.D. box), surrounding one or
more of the labels, specifies that those particular cylinders relate to the
values currently shown in the Scanner® information area.
4CHT absolute scale
The ‘CHT absolute scale’ allows you to quickly determine the absolute
temperature of any CHT by comparing the bargraph height to the scale.
This is a quick and useful way to visually determine your CHT
temperatures relative to redline.
5Bar Graph EGT and CHT
A cylinder ‘bargraph set’ is composed of a dotted line leading from the
cylinder I.D. number vertically to its EGT/CHT digital values. The EGT
column is located to the left of the line and the CHT column to the right.
Columns are composed of a stack of segments. The maximum height for
a column is the top of the dotted line. The CHT redline value is depicted
by a horizontal red line approximately half way up and to the right of the
dotted line. When any CHT column reaches redline, its column will turn
red and an alarm message will commence. The CHT display is not
affected by mode or view. The EGT column has three different viewing
modes: Percent View, Normalize View and Lean Find.
6Percent HP (EDM-830 only)
Displays %HP (if FF, RPM, OAT, MAP functional).
7Scanner® Information Area
The Scanner® Information Area provides expanded information for the
various monitored parameters. The Scanner® operates automatically or
manually.

For Your Safe Flight Page 11
8TIT Bargraph
The EDM provides a bargraph display of the hottest TIT and
continuously checks for exceedance of the redline temp. Once redline is
reached, the bargraph will change to red and an alert will flash in the
Scanner® Information Area.
9Linear Gauges
The Linear gauges provide both digital and analog indications for
various parameters. The sliding pointer and color range marks give you a
quick indication of where you are relative to the operating limits while
the digital value provides precise information. See Section 14 - Display
Customization for ways you can customize this area. Note: parameters
monitored vary by model and options present.
EGT and CHT operation in Scanner® Information Area
When the Cylinder I.D. Box highlights a cylinder number (1 through 6),
the Scanner® Information Area will show the EGT value on the left
(four digits) and the CHT value on the right (three digits). Other
parameters are displayed in the digital display as described in the
subsection “Scanner® Information Area” on page 19.
4 digit
display of
EGT 1
3 digit
display of
CHT 1
Cylinder # 1
highlighted

Page 12 Engine Data Management
Typical display configurations by model and mounting orientation
The EDM-730/830 series features the ability to be mounted either in
landscape or portrait orientation. Display layouts will differ as a result of
configuration differences. You may examples of the EDM-830 and
EDM-730 are shown below:
EDM-830 6 Cylinder
(landscape orientation)
EDM-730 6 Cylinder
(portrait orientation)
EDM-830 6 Cylinder
(portrait orientation)

For Your Safe Flight Page 13
EDM-830 RPM & MAP
(portrait orientation)
EDM-830 RPM and MAP Display
The EDM-830 depicts both RPM and Manifold Pressure graphically and
digitally. Examples are shown for both landscape and portrait
orientation. When a power setting exceeds redline, the digital value
changes to red and a blinking message appears in the Scanner®
Information Area. Percent horsepower is located in this display area
also.
EDM-730/830 Linear Gauges
This area contains linear bar
graphs with digital displays. When
a value exceeds red line, it is
displayed in RED. You can
customize what appears in each
position. Examples of available
displays are:
Voltage (BAT)
EGT Span (DIF)
Shock Cooling (CLD)
Oil temperature (O-T)
Oil pressure (O-P)
Outside Air Temperature (OAT)
Fuel flow, units per hour (GPH)
Fuel Used (USD)
Fuel Remaining (REM)
Fuel Required to waypoint or
destination (REQ) EDM-830
Linear Gauge
EDM-830 RPM & MAP
(landscape orientation)

Page 14 Engine Data Management
EDM-730/830 Basic Scanner® Operation
The EDM-730/830 Scanner section contains graphic representation of
EGT, CHT and TIT values as well as containing a general purpose text
message area. It will go into Automatic scan mode a few minutes after
power up. You don’t have to touch any buttons.
Cylinder numbers
1 through 6. T is
TIT
CHT
redline
Cylinder I.D. box indicates
which cylinder temperatures
are show in the digital display
Engine temps
in F or C
TIT redline
Digital EGT/CHT/TIT
values
CHT
absolute
scale
Scanner Information Area
EGT: Exhaust Gas Temperatures
Blue segments represent temperature magnitude and are located to the
left of the vertical dotted line present in each cylinder bar graph.
Cylinder I.D. numbers are located just below the dotted line (one for
each cylinder on the engine). A white square around a cylinder I.D.
number identifies which cylinder the Scanner® digital value relates to
(cylinder 3 in the above example). The digital value is always present
above the dotted line and is Blue.
CHT: Cylinder Head Temperatures
White segments represent temperature magnitude and are located to the
right of the vertical dotted line present in each cylinder bar graph.
Cylinder I.D. numbers are located just below the dotted line (one for
each cylinder on the engine). A white square around a cylinder I.D.
number identifies which cylinder the Scanner® digital value relates to
(cylinder 3 in the above example). The digital value is always present
above the dotted line and is White. CHT redline is depicted by red
horizontal lines half way up the bar graph scale.

For Your Safe Flight Page 15
TIT: Turbine Inlet Temperature
Light Blue segments represent temperature magnitude (at the same scale
as EGT) and are located to the right of the last cylinder bar graph set. A
‘T’ just below the dotted line identifies this as TIT. When a white square
surrounds the ‘T’, this signifies that the scanner digital values relate to
TIT. The digital value is always present above the dotted line and is
Light Blue. TIT redline is depicted by a red horizontal line above the
majority of the TIT bar graph area.
There are two views: Normalize view levels the EGT columns and
increases the sensitivity of the Scanner® bar graph columns. To enter
the Normalize view, hold the LeanFind button for three seconds. The
NRM icon will be displayed above the Scanner® section and the bars
will be blue. Hold the LeanFind button for three seconds to return to the
Standard view. See page 9 for a more detailed description.
Operating Modes
There are three standard operating modes of the EDM: Automatic,
Manual, and LeanFind. These modes will be described in more detail
beginning on page 20. When you first turn on the power the EDM starts
in the Manual mode, but will enter the Automatic mode after two
minutes (most of the time you will operate the EDM in the Automatic
mode). The three modes primarily affect the Scanner® Information
Area.
Automatic Mode
Just tap the LF button, then tap the STEP button. No user
intervention is required to use this mode. Each cylinder and each
parameter value is automatically sequenced and shown in the digital
display for a few seconds.
Manual Mode
Just tap the STEP button. This stops Automatic Mode. Each indexed
parameter is frozen in the digital display until you manually index to the
next parameter by tapping the STEP button.
LeanFind Mode
Simply pre-lean, tap the LF button and begin leaning. The EDM will
assist you in finding the correct cylinder to peak to set your mixture to.

Page 16 Engine Data Management
Button Location and Display Rotation
The EDM can be mounted in four different positions. After mounting,
you may need to remove and relocate the white button to the ‘STEP’
location. You may also need to rotate the EDM display. Clear any alarms
and hold STEP (about 6 seconds) until you see the overlayed arrow.
This arrow indicates where the top of the display will be. Tap LF until
the arrow points to 12 o’clock. Now tap STEP. Your display should
now be upright. The button functions are depicted in the four possible
orientations as shown below:

For Your Safe Flight Page 17
The STEP and LF buttons control all functions of the EDM. The term
tap denotes pressing a button momentarily. The term hold denotes
pressing and holding a button for five seconds or longer.
STEP Button - Primary functions
In the Automatic mode, tapping the STEP button will change to
the Manual mode. Subsequent taps of the STEP button will
display the next parameters in the sequence.
In the LeanFind mode tapping the STEP button will terminate
the LeanFind mode and change to the Automatic mode.
STEP Button - Secondary functions
In the Manual mode, holding the STEP button will display the
previous parameters in the sequence (rapidly backwards).
In the Pilot Program Mode, tapping the STEP button will
generally advance to the next item in the list.
When an alarm is displayed, tapping the STEP button will
prevent that alarm from appearing for the next ten minutes.
When an alarm is displayed, holding the STEP button until the
word OFF appears, prevents that alarm from appearing for the
remainder of the flight.
LF Button - Primary functions
In Automatic or Manual modes, tapping the LF button will
change to the LeanFind mode.
In the LeanFind mode, holding the LF button after peak EGT is
found will display peak EGT.
In Automatic or Manual modes, holding the LF button for three
seconds will toggle between Percentage and Normalize views.
EGT Normalize View
is ON.
(NRM icon on)
EGT Percentage view
is ON.
(NRM icon off)
hold LF button
for 3 seconds

Page 18 Engine Data Management
LF Button - Secondary functions
In the pilot programming procedure, holding or tapping the LF
button is used to increment or decrement parameter values and
toggle between Yes and No answers to questions.
STEP and LF buttons together
Holding both the STEP and LF buttons simultaneously, for
several seconds, changes to the Pilot Programming Mode.
Holding both the STEP and LF buttons simultaneously for
several seconds when in a unit programming mode and ‘END? Y’
is displayed will take you to the next programming mode (if one
exists).
Holding both the STEP and LF buttons simultaneously for
several seconds after entering LeanFind mode but before
beginning to lean will toggle between leaning ‘Rich Of Peak’ and
‘Lean Of Peak’.
Tapping both the STEP and LF buttons simultaneously in
Manual mode toggles to include or exclude the displayed
parameter from the Automatic mode. It has no affect on the
displayed parameters in the Manual mode.

For Your Safe Flight Page 19
Scanner® Information Area
The Scanner® Information Area provides expanded information in the
form of alpha-numeric messages, parameters and calculations. In Auto-
Scan, parameters will ‘scan by’ once every 4 seconds (default). This rate
can be changed in Pilot Programming Mode. Tap the STEP button for
‘Manual’ selection of any parameter. Parameters for the installed options
will be displayed - uninstalled parameters will not appear.
DISPLAY PARAMETER DESCRIPTION
EGT 1436 CHT 382 EGT/CHT Shows successive pairs of
EGT & CHT per STEP tap.
1580 TIT TIT 1 Turbine Inlet Temp #1
1490 TI2 TIT 2 Turbine Inlet Temp #2
204 OIL-T OIL TEMP Oil temperature
64 OIL-P OIL PRES Oil pressure
75 CLD SHOCK COOL CHT cooling rate (deg/min)
13.9 BAT BATTERY Battery/Bus voltage
23 OAT OAT Outside air temperature
40 DIF DIF Hottest minus coldest EGT
56 CRB CRB Carburetor Air Temp (only
allowed if IAT not present)
145 CDT CDT Compressor Discharge Temp
(only allowed if CRB not
present)
105 IAT IAT Intercooler Air Temp
-40 C-I CDT-IAT Intercooler cooling
RPM 2460 MAP 23.6 POWER RPM & MAP values
Calculated
68.0 REM REM Calculated fuel remaining
12.7 REQ FUEL
REQUIRED
Calculated fuel required to
reach waypoint (GPS interface
must be correct)
Calculated
55.2 RES FUEL
RESERVE
Calculated fuel reserve at
waypoint (GPS interface must
be correct)
9.8 MPG MILES PER
GALLON
Calculated fuel miles per units
(GPS interface must be
correct)
Calculated
04:32 H:M ENDURANCE Calculated time remaining to
fuel exhaustion
15.0 GPH FUEL FLOW
RATE Calculated fuel flow rate in
units per hour
7.2 USD FUEL USED Calculated fuel used

Page 20 Engine Data Management
Section 2 - Operating Procedures
Built-in Diagnostics: Startup and During Flight
When your EDM is first turned on, the screen begins by showing the
unit model number and TSO category. Next, several display patterns are
presented allowing you to check for proper screen operation. During this
time, the EDM is conducting built-in-tests of certain components,
calibration and probes. Any newly installed options are found and
logged in at this time. If a probe problem is found, diagnostic indications
will be presented on the display. These vary depending on the parameter.
For CHT, EGT and TIT, a message appears in the Scanner® Information
Area. For example, if EGT#2 were open circuit, the message would read
‘OPEN EGT 2’. For an inoperative horizontal linear gauge function, a
red ‘X’ is drawn through it and its digital value is dashed out. Probes
determined to be faulty during the power up checks are disabled from
the Scanner® automatic sequence. During flight, probes are periodically
checked for inconsistent or intermittent signals and are disabled if
deemed unusable in which case an appropriate message will appear.
EDM Modes
The EDM has three different operating modes: Automatic,Manual and
LeanFind. When you first turn on the power the EDM starts in the
Manual mode, but will enter the Automatic mode after a few minutes.
The Automatic mode provides you with engine monitoring information
for the majority of flight conditions. To adjust the mixture, use the
LeanFind mode. To display specific parameters, use the Manual mode.
In either Automatic or Manual modes, the cylinder bar graphs show a
graphic representation of EGT and CHT for each cylinder and TIT (if
present).
Automatic Mode
Just tap the LF button, then tap the STEP button. No other user
intervention is required to use this mode. The EDM will begin
displaying the parameter sequence at the programmed ‘RATE’ (see
“Personalizing” on page 45).