Hamilton Sundstrand Company Fuel Metering Valves XVG User Manual

 

 

 

Perform the following steps to retrieve the fault records: 

 

1.  Read register 3045, IDM_RECORDS, to get the current number of fault 

records available in the XVG/eXVG.  The records are named 0, 1, 2, .. , n-1.  
Maximum  n = 16. 

2.  To retrieve first record, record 0, write 0 to register 3043, 

IDM_FRECORDNO. 

3.  Write 4 to register 3094, IDM_TESTCTRL. 
4.  Read registers 3028, 3029, 3044, 5026, 5028, 7050-7072 to complete record 

0. 

5.  Repeat steps 2, 3, 4, and 5, to retrieve record 1, 2, .., n-1. 

 
 

 

3005 IDM_SETUPCONNECT 

Setup Mode: 1=Set Valve in Setup State, 2=Exit 
Setup and Reset CPU 

U16

 

W1 

3033 IDM_CALFLAGS 

Calibration 

Flags 

U16

 

W1 

3099 IDM_TESTSTR 

Test string, used for Modbus write access 
password. 

U16

 

W0 

7008 

IDM_MEASFLOW 

Measured Flow, PPH 

Float

 

Read

 

7518 IDM_CONSTR 

R Gas Constant: must be non-zero, default is 
Air, 53.34 

Float

 

W0 

7520 IDM_CONSTK 

K Gas Constant: must be non-zero, default is 
Air, 1.4 

Float

 

W0 

 

Perform the following steps to change gas constant R and K in real-time. 

 

1.  Read registers 7518, 7520, and 7008, to get the R, K, and corresponding 

measured flow values.  Take note of the R and K values for reference.  The 
only way to restore the default values without a valve close and reset (engine 
shutdown) is to write those values into the valve again. 

2.  Write registers 7518 and/or 7520 with appropriate new values. 
3.  Read register 7008 to get new measured flow value. 
4.  Read the registers that are of interest to your application. 
5.  If desired, save the new R and K value to the valve.  Note that the following 

SAVE or RESET procedure will CLOSE and RESET the valve. 

 

SAVE Parameters routine: 

 

-  Write a password to register 3099. 
-  Write 1 to register 3033.  Wait 100 milliseconds. 
-  Write 32 to register 3033.  Wait 100 milliseconds.   
-  Write 1 to register 3005.  Wait 100 milliseconds. 

 34