Infrastructure & Cities OpenAirTM VAV Compact Controllers G..B181.1E/3 VAV Modular Controller ASV181.
Issued by Siemens Switzerland AG Smart Infrastructure Global Headquarters Theilerstrasse 1a 6300 Zug Switzerland Tel. +41 41-724 24 24 www.siemens.com/buildingtechnologies © Siemens Switzerland AG, 2011 Technical specifications and availability subject to change without notice. 2 / 44 Siemens Smart Infrastructure VAV compact controller G..B181.1E/3 | VAV modular controller ASV181.
Table of contents 1 Introduction..........................................................................................4 1.1 Revision history .....................................................................................4 1.2 Before you start .....................................................................................4 1.3 Objectives of this basic documentation...................................................4 1.4 References .....................................................
1 Introduction 1.1 Revision history Version 1.2 Date 26/10/2021 Changes Adjustments regarding AST22 Section Pages 1.1 26/02/2016 EU and RCM Conformity, European Directive 2012/19/EU 8 Technical data, 10 Environmental compatibility and disposal 38 41 1.0 12/12/2011 Newly created for Series E 1.2 Before you start 1.2.
1.4 [1] [2] [3] [4] [5] [6] [7] [8] References G..B181.1E/3 – Datasheet for VAV compact controller (N3544) G..B181.1E/3 – Mounting instruction for VAV compact controller (M3544) ASV181.1E/3 – Datasheet VAV modular controller (N3545) ASV 181.
VAV compact and modular controllers Tools for commissioning and service 2 Device 2.1 Type summary 2.1.1 Device variants, tools, and accessories GDB181.1E/3 (5 Nm) GLB181.1E/3 (10 Nm) AST20 The handheld tool AST20 can be used for status monitoring, VAV parameter setting, and bus configuration setting. It supports a Service and an OEM access level with PIN code protection. ASV181.
2.1.2 Selection guide for all types 7 / 44 Siemens Smart Infrastructure VAV compact controller G..B181.1E/3 | VAV modular controller ASV181.
2.1.3 Version summary Each VAV Compact Controller has a product series identification which can be found in the top right corner of the product label. The product series gives information about significant hardware or firmware changes.
2.2 Design and device parts 2.2.1 Design The VAV compact controllers consist of a differential pressure sensor, actuator and digitally configurable control electronics. They are intended for mounting on damper shafts of a minimum length of 30 mm. They consist of base and 2-sectional housing. Components contained in the base: • Steel base plate with damper drive shaft fixing for different drive shaft diameters / cross-sectional areas (cf. section 2.
Dimensions 2.3 43 71 4.15 26.5 G..B181.1E/3 61 9.6 41.3 87 137 158 Measures in mm ASV181.1E/3 Measures in mm 2.4 Human-machine interface The multicolor LED states are described below. LED state display LED display Description LED dark No operating voltage LED green Faultless operation LED flashes red Connection tubes for sensor interchanged LED red Differential pressure sensor fault 10 / 44 Siemens Smart Infrastructure VAV compact controller G..B181.
Internal diagrams 2.5 The VAV compact controllers are supplied with one prewired 6-core power supply and communication cable. The VAV modular controller is supplied with one prewired 6-core power supply and communication cable and one prewired 4-core connection cable for OpenAir 3P damper actuators. All interconnected devices must be connected to the same G0. G..B181.
2.6 Measuring principle A measuring device for acquiring the differential pressure – usually a measuring cross, measuring orifice or Venturi tube in the airflow – represents the basis for air volume flow measurement. Differential pressure sensor The air volume flow is measured indirectly with a differential pressure sensor. Since the measured value is the differential pressure p, the air flow is derived from this value using the VAV box characteristic.
Application 3 Application 3.1 Fields of application VAV compact controllers are primarily used for controlling a variable or constant air volume flow.
Application examples 3.3.1 Operating examples N1 G..B181.1E/3 N2 Supervisory controller 3544A04 G AC 24 V VAV Supply / extract air control in operating mode “con” 3.3 G D1 B1 G0 Y1 G Y2 Y10 N2 G Y2 G0 U Y1 YC N1 Supply / extract air control in operating mode “con” G AC 24 V CAV 3544A13a G0 G Y2 G0 U Y1 YC N1 Vmin = Vkonst G0 Complete shutoff in operating mode “con” G DC 0/2...10 V N1 G..B181.
N1 G..B181.1E/3 G AC 24 V Operating mode “STP” Vmax G Y2 Y1 YC G0 U Vmid Vmin N1 G0 3544A14 Connection diagrams 3.3.2 Legend to the connection diagrams 1 through 4 N1 G..B181.1E/3 or ASV181.1E/3 N2 Room temperature controller S1 Y1 Window switch (window closed = contact open) OpenAir actuator, e.g. GCA131.
Control loop without communication, e.g. with GCA131.1E and room temperature controller. 3545A01 Connection diagram 2 (ASV181.1E/3) G 6-1 7-1 8-1 AC 24 V 1-1 G G0 D1 B1 Y1 G Y2 Y10... N2 (G) (Y1) (Y2) (YC) (G0) (G) (G0) (Y11)(Y22) U N1 2-1 1-2 2-2 6-2 7-2 9-1 b) a) c) 1 G 2 6 7 G0 Y1 Y2 Y1 G0 Note Outputs Y11, Y22, G and G0 are not short-circuit-proof! Connection diagrams 3a through 3c VAV supply or extract air control (examples) DC 0...10 V G DC 0...
CAV supply or extract air control (examples) 4a: Control to Vmin value 4b: Control to Vmax value AC 24 V G G0 Y2 Y1 YC U N1 G0 G G0 Y2 Y1 YC U N1 G0 4c: Complete shutoff 4d: Fully open G0 Y2 Y1 AC 24 V AC 24 V G YC U 3544A08 G 3544A07 G N1 G0 Connection diagram 5 3544A06 G 3544A05 G AC 24 V Connection diagrams 4a through 4d G G0 Y2 Y1 U YC N1 G0 Supply / extract air control, e.g. with G..B181.1E/3 “3P” mode and room temperature controller.
4 Electrical and mechanical installation 4.1 Mechanical installation / mounting Mounting and mounting limitations For mounting and limitations on mounting (location / position), consulting the mounting instruction M3544 ([2]) or M3545 ([4]) is mandatory. Environmental conditions The permissible ambient temperature and ambient humidity must be observed. Manual control The actuator may only be manually operated when separated from power supply.
4.2 Introduction Electrical installation / cabling Prior to wiring, observe all information in the following sections: • „Safety notes" in section 7.1 • „Device-specific regulation” in section 7.2. • „Notes on EMC optimization” in section 7.3. 4.2.1 Power supply cabling Permissible cable lengths and crosssectional areas The permissible cable lengths and cross-sectional areas depend on the VAV compact controllers’ current draw and the voltage drop on the connecting lines to the actuators.
L/P chart for AC 24 V The chart below applies to AC 24 V operating voltage and shows the permissible cable length L as a function of power P, and the cross-sectional areas as a parameter. 4614D01en L [m] 300 200 2.5 mm² 0.75 mm² 100 1 mm² 1.5 mm² 0.5 mm² 0 8 0 Note on chart 16 P 32 [VA, W] 24 The values in [VA, W] on the P-abscissa are allocated to the permissible voltage drops (U/2U = 4 %) on line length L as per the above table and the basic diagram.
Example: Power consumption and permissible voltage drop (1 VAV compact controller) Example: Parallel connection of 4 VAV compact controllers Operating voltage Power consumption Perm. voltage drop for line... 1 (G), 2 (G0) AC 24 V 3 VA 4 % of AC 24 V Determine the cable lengths for 4 VAV compact controllers operating on AC 24 V. Decisive for sizing the cable are only the AC currents on lines 1 (G) and 2 (G0). Maximum permissible voltage drop = 4 % per line.
5 Parameterization and operating modes 5.1 Settings and user interaction The VAV compact controllers can be parameterized with configuration tools (cf. “equipment combinations”)2.
5.2 Operating mode “con” Variable air volume (VAV) control Operating modes The following parameters must be set or checked in operating mode “con”: Parameter Setting Description Type Setpoint YC V n con 0…10 V 2…10 V 1.00…3.
Constant air volume (CAV) control VAV compact controllers operate in CAV mode if input YC is open. V min or V max control can be accomplished with control signals Y1 and Y2.
Operating mode “STP” CAV step mode: CLOSE / V min / V mid / V max / OPEN CAV step mode (Type “STP”) YC <1 V → V m in open → V m id >9 V → V m ax Note Y1 Y2 open open G0 open G0 G0 open G0 Action CAV step mode Dir r → rotation CW Dir L → rotation CCW “Fully open“ CAV step mode Dir r → rotation CCW Dir L → rotation CW “Fully closed“ Setting V min ≤ 0 drives the actuator to position “fully closed”. 25 / 44 Siemens Smart Infrastructure VAV compact controller G..B181.
Calculation formulas 5.2.1 The parameters are based on the following formulas: Calculation of Vn (Δpnom = nominal pressure) 𝑉𝑛 = √ 300 [𝑃𝑎] ∆𝑝𝑛𝑜𝑚 [𝑃𝑎] 300 Pa is the upper limit of the operating range of the differential pressure sensor. The nominal pressure is the differential pressure in the VAV box at a given nominal volume flow, determined by the OEM specification. Min. and max. volume flows (Vmin / Vmax) 𝑉𝑚𝑖𝑛 [%] = 𝑚𝑖𝑛. 𝑣𝑜𝑙𝑢𝑚𝑒 𝑓𝑙𝑜𝑤 [𝑚3 ⁄ℎ] ∙ 100% 𝑛𝑜𝑚. 𝑣𝑜𝑙𝑢𝑚𝑒 𝑓𝑙𝑜𝑤 [𝑚3 ⁄ℎ] 𝑚𝑎𝑥.
5.3 Configuration and maintenance tools Configuration and retrieval of device parameters can be accomplished with the following tools: • Using the PC software ACS941 or ACS931 together with the interface converter AST22 via the configuration and maintenance interface of the VAV Compact Controller or • Using the handheld tool AST20. 5.3.
5.4 Setting examples 5.4.1 Symbols and parameters Volume symbols with “point” ( V ) and without point (V) shall have the same meaning, i.e., they all shall refer to volume flows.
Setting example A2 VAV ratio control, 20 % constant excess supply air volume flow (positive pressure in the room) Supply air Supervisory controller VAV compact controller Extract air V m in V m ax V m in V m ax 20 % 0% 80 % 100 % 0% 0% 60 % 100 % Reference signal: Ysupply_air = 35 %, Yextract_air = Ysupply_air - 20 % = 15 % Result: Vsupply_air = 35 %, Vextract_air = 15 % Supply air controller Extract air controller V max V min V max V min V 120 120 100 100 80 60 60 40 4
5.4.3 Min/max control by the VAV compact controller When setting the minimum / maximum air volume flow in the VAV compact controller, the supervisory controller must be set to Vmin= 0% und Vmax = 100 %. With this setting, the supervisory controller reference signal for both the supply air and extract air controller is the same. Thus, supply air / extract air control with a single reference signal is possible.
Setting example B2 VAV ratio control, 20 % constant excess supply air volume flow (positive pressure in the room) Supply air Supervisory controller VAV compact controller Extract air V m in V m ax V m in V m ax 0% 20 % 100 % 80 % 0% 0% 100 % 60 % Reference signal: Ysupply_air = Yextract_air = 25 % Result: Vsupply_air = 35 %, Vextract_air = 15 % Supply air controller Extract air controller V max V min V max V min V V 120 120 100 100 80 80 80 60 60 60 40 40 100 10
5.4.4 Master/Slave operating mode To control supply air and extract air in master/slave operating mode, the actual value signal of the master controller (supply air) is the reference signal for the slave controller (extract air).
Setting example C2 VAV ratio control, 20 % constant excess supply air volume flow (positive pressure in the room) Supervisory controller VAV compact controller Supply air (Master) Extract air (Slave) V m in V m ax V m in V m ax 0% 20 % 100 % 80 % 0% -20 % 100 % 80 % Reference signal: Ymaster = 25 % Result: Vmaster = 35 %, Vslave = 15 % Supply air controller (Master) V max V min Extract air controller (Slave) V max V min V 120 120 100 100 80 60 60 40 40 V 100 100 80
Use of planning and commissioning protocol recommended 6 Commissioning 6.1 Documentation of engineering and commissioning It is highly recommended to document all planning data and settings in a way that is easily accessible after a long interval. Especially if special calculated parameters or plant-specific adaptations had to be made during engineering and commissioning, these should be clearly noted. 6.
7 Safety and EMC optimization 7.1 Safety notes This section contains general regulations and the regulations for mains and operating voltage. It also provides important information regarding your own safety and that of the entire plant. Safety note The warning triangle to the left means that observance of all relevant regulations and notes is mandatory. If ignored, injury to persons or damage to property may result.
Operating voltage AC 24 V With regard to AC 24 V operating voltage, the following regulations must be complied with: Regulation Operating voltage AC 24 V Specification on AC 24 V transformers The operating voltage must comply with the requirements for SELV or PELV: • Permissible deviation of AC 24 V nominal voltage at the actuators: +/–20 % • Safety isolating transformers as per EN 61558, with double insulation, designed for 100 % on time to power SELV or PELV circuits • Determine the transformer’s output
7.3 Running cable in a duct Cable types Notes on EMC optimization Make sure to separate high-interference cables from equipment susceptible to interference.
Technical data 8 Power supply AC 24 V (SELV/PELV) G and G0 Operating voltage / frequency G..B181.1E/3, ASV181.1E/3 G..B181.1E/3 Power consumption at Actuator holds Actuator rotates ASV181.1E/3 Power consumption AC 24 V ±20 % / 50/60 Hz 1 VA / 0.5 W 3 VA / 2.5 W 1 VA / 0.5 W Damper actuator (G..B181.
Suitable drive shafts Type of drive shaft Weight G..B181.1E/3 ASV181.1E/3 Air volume controller 3-position controller with hysteresis Round Round, with centering element Square Hexagonal Min. drive shaft length Max. shaft hardness 8...16 mm 8...10 mm 6...12.8 mm <15 mm 30 mm <300 HV Without packaging Without packaging 0.6 kg 0.
9 Datapoints and function description 9.1 Device Parameters (ACS931 / ACS941 / AST20) Parameter Range Description Factory setting Setpoint 0-10 V / 2-10 V (0..100%) Setpoint to VAV controller, relative to Vmin-Vmax operating range 0% → Vmin / 100% → Vmax N/A ACS931, ACS941, AST20 Actual position 0..100% Damper position, depends on setting for position adaptation N/A ACS931, ACS941, AST20 Actual Flow abs. 0..
9.2 Parameters and function description 9.2.1 Vnom (nominal volume flow) [m3/h or l/s] VAV boxes are ordered through an OEM according to this nominal volume flow and min. / max. volume flow settings. The maximum volume flow for ventilating a room / zone can’t be higher than the nominal volume flow. 9.2.2 Vmin / Vmax (minimum / maximum volume flow) [%] These values limit the nominal volume flow and are relative to Vnom. Their effect is described in chapter 5. 9.2.
9.2.5 Adaptive positioning 9.2.5.1 Function For VAV boxes and air dampers with an opening range smaller than 0...90°, the position feedback signal can be adapted to 0...100% if the signal type for the output U is set accordingly. • Adaptive positioning off: Feedback relative to 0°…90°, →Example: 0° → 0%, 18° → 20%, 81° → 90% etc. • Adaptive positioning on: Feedback relative to the mechanical lower / upper endstops which are determined in an adaptation run.
9.2.6 Operating mode The operating mode determines whether the setpoint signal (0…100 %) from the supervisory controller is interpreted as volume flow control or as (air damper) position control. If used as damper control signal, the actual values from the flow sensor remain available. This allows to implement the flow control loop in an external controller. 9.2.7 Restarting the device Restarting is possible by a power-reset (switching operating voltage off and on).
10 General notes Environmental compatibility and disposal The products were developed and manufactured by using environmentally compatible materials and by complying with environmental standards. For disposal, please remember the following at the end of product life or in case of defects: • The products consist of plastics and materials such as steel, ferrite magnetic core, etc. and must not be disposed of together with domestic waste; this applies particularly to the printed circuit boards.
