J.P. Instruments EDM 930 Primary Flight Manual Supplement - Manual (Page 3)

J.P.INSTRUMENTS EDM-930 Airplane Flight Manual
PO BOX 7033 Supplement No. 930-0001 Rev. C
HUNTINGTON BEACH, CA 92646
Page 3 of 4
I. GENERAL
The EDM-930 is a combined electronic indicating system which simultaneously displays to the pilot powerplant and aircraft systems
operating parameters. It includes the following indicating systems; replacing all previous primary digital and/or analog instruments
(The label of the parameter shown on the instrument is indicated in the first parenthesis);[ the acronym shown in the alarm displays is
shown in the second parenthesis]:
1. Engine rotational speed (RPM)(RPM)
2. Engine Manifold Pressure (MAP)(MAP)
3. Engine Cylinder Head Temperature (CHT)((CHT)
4. Engine Exhaust Gas Temperature (EGT)(EGT)
5. Engine Oil Temperature(OIL-T) (O-T)
6. Engine Oil Pressure (OIL-P)(O-P)
7. Fuel Pressure(FUEL-P)(F-P)
8. Fuel Flow (FF)(FF)
9. Fuel Quantity (QTY-LF and QTY-RT) (None)
10. Alternator/Generator Output – Volts (VOLTS)(BUS) and Amps(AMPS)(AMP).
11. Outside Air Temperature (OAT)(None)
12. Turbocharger Compressor Discharge Temperature – {Primary on some turbocharged engines} (CDT)(CDT).
13. Turbine Inlet Temperature - {Primary on some turbocharged engines} (TIT)(TIT)
14. Induction Air Temperature (IAT)(IAT) or Carburetor inlet temperature (CARB)(CRB)
Display
Non-primary functions Induction air temperature, carburetor inlet temperature, EGT Span, bus voltage and Amps, Shock Cooling, Fuel
Remaining, Fuel Required, Fuel Reserve, MPG, Endurance, and Fuel Used have programmable alarm limits. CHT, TIT, EGT, F-P, FF,
and MAP may not be primary on some installations. Any of these non-primary functions are programmable.
The right hand side of the EDM-930 display has 9 vertical scale columns with a digital value below each column. The nine functions
are: OIL-T, OIL-P, FUEL-P, OAT, VOLTS (or CDT, for engine installations having a primary compressor discharge temperature),
AMPS, FF, and two fuel tank quantities (QTY-LF, QTY-RT). The engine RPM and MAP are presented in the upper left corner of the
instrument. The EGT, CHT and TIT are presented in the lower left corner. Below the EGT/CHT columns is a message center that
displays the digital values of the EGT/CHT/TIT and additional functions like shock cooling and caution and limit alarm messages.
Specific values for each parameter are displayed digitally above the vertical scale displays of EGT, CHT, and TIT. The highlighted
indicator below the columns indicates which cylinder's digital information is presently displayed as an alarm in the message center or
when manually or automatically stepping through the parameters.
Programming
Depressing the LF and STEP buttons simultaneously enters the program mode to enter fuel quantities, display scan rate, OAT display
to °F or °C, EGT digital display resolution to 1 or 10° and other setup parameters. Exit by depressing STEP. If either the STEP or LF
buttons are not pushed for three minutes, the EDM-930 will revert to automatic scan mode. Depressing the STEP button will stop the
automatic mode and revert to manual mode. Refer to the EDM-930 Pilot’s Guide Rev. B or later for additional operating information.
This Pilot’s Guide must be available to the pilot for all flight operations.
Remote Alarm Display (RAD )
The RAD is a 0.2” high, 8 character independent display. The RAD will still function if the main display is inoperable. An alarm such
as the CHT on cylinder number 2 is 480 is displayed as 480CHT2. The label CHT2 will flash whenever an over-temperature exists and
will extinguish when the temperature falls below the limit temperature. Other alarms would be displayed as, for example: 2780 RPM,
15 O-P, 34 F-P, 240 O-T.
The RAD is located directly in front of the pilot and displays digital caution and limit excedances when any of the parameters has
reached its preset trigger point. Whenever limit alarms are not triggered, the RAD continuously displays MAP and RPM.
On initial startup or whenever power is turned on, the words “EDM-930 PRIMARY” is displayed, followed by the make and model of
the aircraft for which the primary limits are set.
Alarm Limits
Whenever a parameter reaches the programmed caution trigger point, the main display will flash the amber colored word ALERT and
the parameter acronym. Tapping the STEP button extinguishes these warnings .
Similarly, whenever a parameter reaches a programmed limit value, the display and the RAD will flash the red colored word ALERT
and the acronym. Tapping the STEP button will extinguish the red display warnings on the main display but the RAD will also continue
to flash the acronym until the parameter is not at or beyond the limit value.
FAA APPROVED Date DEC 10 2004