Safety Features; Controller Leds - Siemens 125-5033 Owner's Manual

Two-state constant volume fume hood controller
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Safety Features

The controller board stores the controller's address, applications, and point values. In the
event of a power failure or a reset, these values are retrieved from the controller's permanent
memory and are used by the controller unless overridden by a field panel.

Controller LEDs

To determine if the controller is powered up and working, verify that the Basic Sanity Test
(BST) Light Emitting Diode (LED) is flashing ON/OFF once per second. The controller
contains six LEDs located on the circuit board. See the Controller LED lndicators section of
Chapter 1, Product Overview for more information about LEDs.
NOTE:
Siemens Building Technologies, Inc.
The TX and RX LEDs indicate communication over the FLN.
Troubleshooting
21

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