Manualshelf

Application

ManualsBrandsSiemens ManualsBuilding automationCE Compliant Dual Duct Controller Two Air Velocity Sensors Electronic Output Installation Instructions
12345678910
Table Of Contents
Sequence of Operation
Fail Mode Operation
10
Siemens Industry, Inc. Application Note, App 2521 140-1218
2015-05-06
At the end of a calibration sequence, CAL AIR automatically returns to NO. A status of
NO indicates that the controller is not in a calibration sequence.
Floating Control Actuation Auto-correct
In addition to the existing options for floating control actuator full stroke actions, all
floating control actuators are provided with additional logic to fully drive open or closed
when commanded to 100% or 0%.
Fail Mode Operation
If the air velocity sensor fails, the controller uses pressure dependent control. The
temperature loop controls the operation of the damper.
If the room temperature sensor fails, the controller operates using the last known
temperature value.
Performing the Automated Fault Detection and
Diagnostics
VAV ATEC controllers have a built-in checkout procedure that performs a basic fault
detection and diagnostic routine. It can be manually initiated at any time after the
controller has been installed. This procedure tests all of the necessary I/O and ensures
the controller can operate within the set airflow range, between CLG FLOW MIN and
CLG FLOW MAX.
To perform the checkout procedure, set CHK OUT to YES. When the procedure has
completed, CHK OUT returns to NO and the results display in CHK STATUS, Table
Possible Failure Value and Description
.
Possible Failure Value and Description
CHK STATUS
Values
Description
-1 Checkout procedure has not been run since last controller initialization.
0 No errors found.
1 RTS failed.
2 Room Setpoint dial failed (If STPT DIAL = YES).
4 AVS failed.
8 Controller could not reach CLG FLOW MIN or below.
16 Controller could not reach CLG FLOW MAX or above.
32 Controller did not read low (zero) flow when damper closed.
NOTE:
Multiple failures are added together and displayed as one value. For example, if the
RTS failed (1) and the controller could not reach CLG FLOW MAX (16), CHK
STATUS displays 17.
Failure codes indicate the following possible problems.