146 Start Up
Chapter Two: Installation
38
Exceptions
If the configuration change in the 146 unit is extensive or involves global parameters, all user-
defined parameters are reset to factory defaults. As in the previous discussion, the C11 warning
code is displayed at the next power up. In addition, the E4 error code is displayed after the unit
its turned off and then on again. Therefore, if the C11 warning code is displayed on power up, it
is a good idea to cycle the power again to determine the full extent of the configuration change
on user-defined parameters.
An optional displayless 146 unit cannot display any error codes unless a remote front panel is
connected to it. The presence of error conditions (such as C11 or E4) is indicated when the LED
on the displayless unit remains red instead of turning to green a few seconds after power up. For
more information about the displayless unit and remote front panel option, refer to Displayless
146 Unit, page 98.
146 Start Up
1. Be sure the AC power cord is disconnected.
2. Push the power switch to the OFF position.
3. Plug in the power cord.
4. Push the power switch to the ON position.
The 146 unit responds by activating the front panel window, and testing all LCD
segments. Within 5 seconds the screen changes and the 146 unit defaults to Normal
Mode. The pressure readings for all attached, active gauges are displayed.
5. Allow the system to warm up.
For rated accuracy, the 146 unit should be allowed to warm up for 5 minutes. Refer to
the start up instructions that came with your particular transducers for additional start up
procedures and warm up times. A cold or hot cathode gauge must be turned on since it
is off when the 146 unit powers up.
6. Initiate gas flow in a manner appropriate to your system.
The system is now operational. If a Control board is installed, the 146 unit can control
the system according to default settings, or according to the settings specified in your
configuration sheet.
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