LN0_M466EG7_img_02psd.png
LN0_M466EG7_img_02psd.png

LN0

Control components for VAV terminal unit with dynamic transducer


Compact device for use with VAV terminal units

  • Controller, dynamic effective pressure transducer and actuator in one casing
  • Use in ventilation and air conditioning systems, only with clean air
  • Suitable for constant and variable volume flows
  • Activation of override controls by means of external switch contacts
  • Volume flow rates qvmin  and qvmax  are are factory set and stored in the controller
  • Change of operating parameters by means of adjustment device
  • Service access for the adjustment device and PC configuration software

General information

Application

  • All-in-one control devices for VAV terminal units
  • Dynamic differential pressure transducer, electronic controller, and actuator are fitted together in one casing
  • Choice of various control options based on setpoint value default setting
  • Volume flow rate control is based on setpoint values received from room temperature controller, central BMS, air quality controller or other devices as an analogue signal.
  • Override controls for activating qvmin, qvmax, shut-off or OPEN position can be set with a switch or relay
  • Volume flow rate actual value is available as linear voltage signal
  • Standard filtration in comfort air conditioning systems allows for use of the controller in the supply air without additional dust protection. 

With heavy dust levels in the room:

  • Install suitable extract air filters upstream, as a partial volume flow is routed through the transducer for volume flow rate measurement

If the air is contaminated with fluff, sticky components or aggressive substances:

  • Use of a Compact controller with static differential pressure transducer (e.g. XD0) instead of the Compact controller LN0 described here 



Control strategy



  • The volume flow controller works independent of the duct pressure
  • Differential pressure fluctuations do not result in permanent volume flow rate changes
  • To prevent the control from becoming unstable, a dead band is allowed within which the damper blade does not move.
  • The flow rate range for the controller is set in the factory 

qvmin: Minimum volume flow rate 
qvmax: Maximum volume flow rate

  • Operating parameters are set in the factory according to the order code



Operating parameters



  • qvmin = 0 - 100% of the nominal volume flow rate qvnom adjustable
  • qvmax  = 20 - 100% of the nominal volume flow rate qvnom adjustable
  • If necessary for special applications, customers can use setting ranges that are different from the factory settings. See the Siemens basic documentation for GLB181.1E/KN.



Operating modes



  • Variable or constant value
  • Variable operation (V) 
    The setpoint value is set via the analogue interface, the signal voltage range corresponds to qvmin  to qvmax
  • Constant value mode (F) 
    A setpoint signal is not required, setpoint value corresponds to qvmin



Interface



Analogue interface with adjustable signal voltage range

  • Analogue signal for volume flow rate setpoint value
  • Analogue signal for volume flow rate actual value (factory setting), 
    alternatively: analogue signal for damper blade position (adjustment by others required)



Signal voltage range



  • 0 – 10 V DC
  • 2 – 10 V DC



Parts and characteristics



  • Transducer for dynamic measurements
  • Actuators with overload protection
  • Release button to allow for manual operation 
  • Status LED for supply voltage and errors
  • Connecting cable with 6 wires
  • Service interface



Constructions



  • GLB181.1E/3
    For TVR, TVJ, TZ-Silenzio, TA-Silenzio, TVZ, TVA
    For TVT up to size 1000 × 300 or 800 × 400
  • GLB181.1E/3 (2 units)
    For TVM



Useful additions



AT-VAV-S: Adjustment device AST20



Technical information

Function, Specification text, Order code

  • Function
  • SPECIFICATION TEXT
  • ORDER CODE
Principle of operation Funktionsgrafik_LN0ai.png

① Differential pressure transducer

② Actuator

③ Volume flow controller

④ Setpoint value signal

 


VAV terminal units control the volume flow in a closed loop, i.e. measurement – comparison – correction. For volume flow rate measurement the effective pressure is measured first. This is done via a differential pressure sensor. The integral differential pressure transducer transforms the effective pressure into a voltage signal. The volume flow rate actual value is hence available as a voltage signal. The factory setting is such that 10 V DC always corresponds to the nominal flow rate (qvnom). The volume flow rate setpoint value comes from a higher-level controller (e.g. room temperature controller, air quality controller, central BMS). Variable volume flow control results in a value between qvmin and qvmax. It is possible to override the room temperature control, e.g. by a complete shut-off of the duct. The controller compares the volume flow rate setpoint value to the actual value and controls the integral actuator accordingly.


Category

  • Compact controller for volume flow rate control



Application

  • Control of a constant or variable volume flow rate setpoint
  • Electronic controller for applying a reference value and capturing an actual value signal
  • The actual value signal relates to the nominal volume flow rate such that commissioning and subsequent adjustment are simplified 
  • Stand-alone operation or integration with a central BMS



Area of application

  • Dynamic transducer for clean air in ventilation and air conditioning systems



Actuator

  • Integral; slow-running (run time 150 s or less for 90°)



Installation orientation

  • Either direction



Connection

  • Connecting cable with 6 wires



Supply voltage

  • 24 V AC



Interface/signalling

  • Analogue signal 0 - 10 V DC or 2 - 10 V DC



Interface information

  • Analogue: volume flow rate setpoint value and actual value signal
  • Flow rate actual value: factory set;
  • Actual value signal can be reconfigured to the damper blade position by others



Special functions

  • Activation of CLOSE, qvmin, qvmax, OPEN by means of external switch contacts



Parameter settingParameters specific to the VAV terminal unit are factory set

  • Operating values qvmin, qvmax are factory set
  • Signal characteristic is factory set

Subsequent adjustment using optional tools:

  • Adjustment device, PC software (wired in each case)



Factory condition

  • Electronic controller is factory mounted on the control unit
  • Factory-set parameters
  • Functional test with air (see sticker)


TVRD / 100 / D2 / LN0 / V0 / qvminqvmaxm³/h
|||||||||
12567891011

1 Type
TVR VAV terminal unit 

2 Acoustic cladding
No entry: none
D With acoustic cladding 

3 Material
Galvanised sheet steel (standard construction)
P1 Powder-coated RAL 7001, silver grey
A2 Stainless steel construction 

5 Nominal size [mm]
100, 125, 160, 200, 250, 315, 400 

6 Accessories

No entry: none
D2 Double lip seal both ends
G2 Matching flanges for both ends 

7 Attachments (control components)

LN0 Compact controller with dynamic transducer 

8 Operating mode
F Constant value
V  Variable (setpoint value range) 

9 Signal voltage range
0 0 - 10 V DC
2 2 - 10 V DC 

10 Operating values for factory setting
Volume flow rates in m³/h or l/s
qvconst  (only with operating mode F)
qvmin  (only with operating mode V)
qvmax  (only with operating mode V) 

11 Volume flow rate unit
m³/h
l/s

Order example: TVT/200×100/D2/LN0/V0/200-800 m³/h
Acoustic claddingNone
Materialgalvanised sheet steel
Nominal size200 × 100 mm
AccessoriesDouble lip seal both ends
AttachmentCompact controller with dynamic transducer, 
Operating modeV variable operation
Signal voltage range0 - 10 V DC
Volume flow rate200 – 800 m³/h
 

Variants

  • VARIANTS


Product details, Technical data

  • PRODUCT DETAILS
  • TECHNICAL DATA


Compact controllers for VAV terminal units


VAV terminal units

Type of installation componentPart number
TVR, TVJ, TVT, TZ-Silenzio, TA-Silenzio, TVZ, TVAGLB181.1E/3M466EG7
TVMGLB181.1E/3M466EG7

 

 


Measurement principle/installation orientation

Dynamic measurements, any installation orientation

Supply voltage/frequency

24 V AC ± 20 %, 50/60 Hz
SELV (Safety Extra Low Voltage) or PELV (Protective Extra Low
Voltage)

Functional range

19.2 V – 28.8 V AC
Power consumption – when running3 VA / 2.5 W
Power consumption – when idle1 VA / 0.5 W
Torque10 Nm
Run time for 90°125 s (60 Hz) – 150 s (50 Hz)
Setpoint value signal input0 – 10 V DC, Ra > 100 kΩ
Actual value signal output0 – 10 V DC, max. 1 mA

Connections

Connecting cable approx. 0.9 m, 6 x 0.75 mm²

IEC protection classIII (protective extra-low voltage)
Protection level

IP 54

EC conformityEMC to 2014/30/EU
Weight0.6 kg



Product details


Analogue interface 0 – 10 V or 2 – 10 V DC (operating mode V, F)
The analogue interface can be set for signal voltage range 0 – 10 V DC or 2 – 10 V DC. The assignment of 
the volume flow rate setpoint value or actual value to a voltage signal is shown in the characteristic curves.
▪   The set signal voltage range applies to both setpoint value and actual value signals
▪   The signal voltage range is set in the factory according to the order code
▪   The signal voltage range can be adjusted with an adjustment device (by others).

 

Setpoint value setting 
▪   With operating mode V (variable operation), the setpoint comes from an analogue signal on terminal YC
▪   The selected signal voltage range 0 – 10V or 2 – 10V DC is assigned to the volume flow rate range qvmin  – qvmax  .
▪   Volume flow rate range qvmin  – qvmax  is set in the factory according to the order code
▪   Subsequent adjustment of qvmin  or qvmax  is possible with an adjustment device

▪   With operating mode F (constant value mode), an analogue signal is not required on terminal YC
▪   The set flow rate constant value qvmin  is used
▪   Volume flow rate qvmin  is set in the factory according to the order code
▪   Subsequent adjustment of qvmin  is possible with an adjustment device

 

Actual value as feedback for monitoring or tracking control 
▪   The actual volume flow rate measured by the controller can be captured as a voltage signal at terminal U
▪   The selected signal voltage range 0 – 10 V DC or 2 – 10 V DC is mapped to the volume flow rate range 0 – qvnom  

 

Override control
For special operating situations, the volume flow controller can be put in a special operating mode (override control). 
. The following modes are possible: control qvmin , control qvmax , damper blade in the OPEN position or damper blade CLOSED.

  • Override control using signal inputs Y1 and Y2
    With appropriate wiring on signal inputs Y1 and Y2, the override controls can be activated according to the connection diagrams via wiring with external switch contacts/relays.
  • Override control CLOSE using control signal on YC
    For signal voltage ranges 0 – 10 V and 2 - 10 V DC: CLOSED is activated if qvmin = 0 and the control signal on YC = 0 V DC.

 

Status indicator

Status LEDMeaning
DarkNo supply voltage
GreenNormal operation
Red, blinkingConnection tubes of the differential pressure sensor have been mixed up
RedPressure sensor fault

 

Supplementary manufacturer documentation

  • Siemens VAV compact controller G.B181.1E/3

 

For additional, detailed information about this control component see the Siemens HIT portal.

  • http:\www.hit.sbt.siemens.com 
  • Find GLB181.1E/3
  • Data sheet N3544
  • Detailed technical information P3544 on the controller
  • Installation manual M3544

 
  



 


Control strategy

  • Volumenstromregler arbeitet kanaldruckunabhängig
  • Druckschwankungen bewirken keine bleibenden Volumenstromabweichungen
  • Eine Totzone (Hysterese), innerhalb der die Stellklappe nicht bewegt wird, sorgt für stabile Regelung
  • Volumenstrombereich werkseitig im Regler parametriert 


qvmin: minimaler Volumenstrom 
qvmax: maximaler Volumenstrom



  • Betriebsparameter werden per Bestellschlüssel festgelegt und werkseitig parametriert


 


Operating parameters

  • qvmin= 0 - 100 % vom Nennvolumenstrom qvnenn einstellbar
  • qvmax = 20 - 100 % vom Nennvolumenstrom qvnenn einstellbar
  • Für spezielle Anwendungen können bauseits von den Werkseinstellungen abweichende Einstellbereiche genutzt werden. Hierzu ist die Siemens Basisdokumentation des GLB181.1E/KN zu konsultieren.

Downloads

product information

certificates

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Our department for Service-Requests will contact you asap.
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Tel.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051