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Application

ManualsBrandsSiemens ManualsRoom controlsRoom Condition Monitor, RPM series
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Sequence of Operation
Actuator Position on Return from Power Failure
38
Siemens Industry, Inc.
BACnet LCM-OAVS, Application 6760
Actuator Position on Return from Power Failure
Supply Damper
On a return from power failure, the damper-command DOs (DOs1 through 2) remain
OFF for 5 seconds prior to resuming control. Because of this it is recommended that
the Supply Damper Motor Setup be set to Enabled (normally closed) for rooms where
negative or neutral pressurization is required and Enabled and Reversed (normally
open, where the actuator is retracted) for positively pressurized rooms.
Additive Values that Determine the Value of MTR SETUP
Not Used
Enabled
Enabled and
Reversed
Motor 1 (supply damper – DO 1 and DO 2)
0
1
3
GEX Valve
On a return from power failure, the AOs remain OFF for 5 seconds prior to resuming
control. Because of this it is recommended that the General Exhaust Valve be set to
Normally Opened for rooms where negative or neutral pressurization is required and
Normally Closed for positively pressurized rooms. Setting of the Venturi direction is via
VENTURI ACT.
VENTURI ACT
0
Exhaust Venturi Valve is Normally Closed (Direct Acting)
1
(default)
Exhaust Venturi Valve is Normally Opened (Reverse Acting)
Operation of AVS FAILMODE
AVS FAILMODE is an enumerated point that describes how the supply Damper and
the general exhaust Venturi Air Valve will respond if one or both Air Velocity Sensors
(AVS) fail. It can handle both positively pressurized rooms and negatively pressurized
rooms.
The default value of AVS FAILMODE is
0. This default causes both the supply and
general exhaust to hold their current position when an AVS fails. Open Supply, Open
Exhaust and Close Supply, Close Exhaust are not defined AVS FAILMODE states.
AVS Failure and AVS FAILMODE Table Values.
AVS FAILMODE
0
(default)
Hold Supply, Hold General Exhaust
1
Hold Supply, Open General Exhaust
2
Hold Supply, Close General Exhaust
3
Open Supply, Hold General Exhaust
4
Close Supply, Hold General Exhaust
5
Close Supply, Open General Exhaust