Hamilton Sundstrand Company Gas Fuel Metering Valve HFG2.0 - Manual (Page 56)

50 HFG2.0 USER GUIDE
3.8 Changing Set-Up Parameters
The HFG2.0 uses a number of variables to define its functionality. These
variables are called Set-Up parameters and they are stored in the
EEPROM in the HFG2.0. Default values for these variables are loaded
into the EEPROM at the PECC factory. The Set-Up parameters are
reloaded into the system registers each time the HFG2.0 is powered up
or reset. See Table 3-5 for typical Set-Up parameters.
Users can change the Set-Up parameters to better suit their specific
applications. These parameters are uploaded to the HFG2.0 via the
RS232 interface using PECC’s ActWiz software. The Set-Up parameters
can only be accessed when the HFG2.0 is in the Power Up / Set Up
state. See the Basic Operation Flow Chart in Figure 3-1 and the Power
Up / Set Up State section below for details.
Contact PECC for a copy of ActWiz software. See the ActWiz Software
Manual for further details.
Power Up / Set-Up State
The HFG2.0 is in Power Up / Set Up state immediately after the HFG2.0
has been powered up or reset. This is after the system registers have
been cleared and the Set Up parameters have been reloaded, but before
the Homing process has begun (RUN command = OFF). This is the only
state in which the user can communicate with HFG2.0 via the RS232
interface. In this state, a set-up file can be downloaded to view the current
Set-Up parameters or uploaded to establish new Set-Up parameters. A
Fault file can also be downloaded, also using the ActWiz software. Please
see the ActWiz software manual for more information.
CAUTION
The HFG2.0 will not hold position when communicating with ActWiz
software. The return spring causes the poppets to return to the soft
seats, thereby closing the valve.
A fault file also can be downloaded when the HFG2.0 is in the Power Up /
Set Up state by using ActWiz software via the RS232 interface. The fault
file will provide fault information and possible causes