OpenAir GMA..1 actuators with spring return Technical basics Edition 2.
/44 Siemens Building Technologies GMA..
Table of contents 1 Introduction ................................................................................................... 5 1.1 Revision history............................................................................................. 5 1.2 About this document ..................................................................................... 5 1.3 Document contents ....................................................................................... 6 2 Spring-return actuators ..
7.1 General checks ...........................................................................................27 7.2 Electrical function check .............................................................................. 27 7.3 Modbus .......................................................................................................29 7.3.1 HMI – Human-machine interface ................................................................ 29 7.3.2 Push button addressing ............................
1 Introduction 1.1 Revision history Changes Type summary Description of functions Electrical parallel connection of actuators Technical data (without type GMA19... Referenced documents (related to GMA) Self-adaptation (diagram /example) Self-adaptation (position indicator GMA16..1) Operating voltage DC 24…48 V Accessorie ASC77..
1.3 Document contents This document contains technical fundamentals on the actuators with spring return of type series GMA..
2 Introduction Spring-return actuators This chapter provides information on application, functions, and device combinations. Furthermore, it contains a type overview and explains the actuator design including setting and operator elements for this family of actuators. 2.1 Application Spring-return actuators are used in ventilating and air conditioning plants to operate air dampers and air throttles: ∂ For damper areas up to 1.5 m 2, friction-dependent.
2.3 Description of functions The functions are listed in a table and are assigned to the respective control types. Type Control type Positioning signal with adjustable characteristic function GMA12..1 / GMA32..1 GMA13..1 GMA16..1 GMA161.1E/MO Two-position control Three-position control Modulating control Modbus RTU - Y = DC 0...35 V with offset Uo = 0...5 V and span ΧU = 2...30 V - - Clockwise or counter-clockwise movement depends on the mounting position of the damper shaft.
2.3.1 Function description supplement for GMA16..1 The following information applies to the standard and enhanced versions of the modulating actuators. Characteristic function GMA163.1, GMA164.1 Offset Uo and span ΧU can be adjusted using two potentiometers (see 3.4 "Adjustable characteristic function"). The maximum permissible input voltage (Uo + ΧU) is DC 35 V.
2.5 Structure and design Description The GMA...1 electronic actuators are available for two-position, three-position, modulating and networked control with spring return. The nominal torque is 7 Nm. The actuator's connection cables are prewired. Housing Robust, light-weight full metal housing from aluminum diecast. The housing guarantees a long actuator life even under harsh environmental conditions.
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3 Introduction Technical design This chapter discusses the following topics: ∂ Drive motor and spring return ∂ Adjustable auxiliary switches ∂ Adjustable characteristic function (positioning signal, DC 0...35 V) ∂ Control characteristics by including the neutral zone 3.1 Drive motor and spring return Motor technology The brushless DC motor allows for accurate speed control, torque supervision to protect the actuator and dampers, and provides a reliable spring return function.
3.3 Electrical functions Auxiliary switches and positioning signals The illustration below shows the relationship between the rotary angle, the adjustable switching points for auxiliary switches A and B, and the positioning signal.
3.4 A modulating positioning signal DC 0..35 V from a controller controls the actuator. The rotary angle is proportional to the positioning signal. Using potentiometer "Uo", you can set the offset for DC 0...5 V, and with potentiometer " ΧU", you can set the span for DC 2...30 V. Ys [%] 100 1) 4) 3) 2) Ys 4637D04 Actuators GMA163.1, GMA164.
Y S [%] 100 4637D02 Characteristic function for the above example Max. positioning range Ysmax = Span Ys = Offset Uo = Span ΧU = 50 0 2 Uo U min 3.5 10 18 Y [V] 100 % (95°) 50 % (47.5°) 2V 16 V Effective span ΧUw = Umax – Umin = 10 V - 2 V = 8 V ΧU (16 V) U max Neutral zone For modulating control actuators, note the control characteristic for the selected switchon point of the setpoint. Actuators GMA161.1, 166.1 (DC 0...
4 Engineering notes Introduction Carefully study the basics of the control systems used before proceeding to the sections below, and pay special attention to all safety-related information. Intended use Use these actuators in a system only for applications as described in the basic system documentation of the control systems used. Additionally, note the actuator-specific properties and conditions as described in this chapter and in chapter 8 "Technical data" in this document. 4.
Operating voltage AC 24 V, DC 24…48 V, AC 230 V The following regulations apply to these operating voltages: Operating voltage ∂ AC 24 V ∂ DC 24…48 V Operating voltage AC 230 V Specification on AC 24 V transformers Safety transformers as per EN 61558, with double isolation, designed for 100 % runtime to supply SELV or PELV circuits. Determine the transformer’s power consumption by adding up the power consumption in VA for all actuators used.
Auxiliary switches A, B Feedback potentiometer for position indication Electrical parallel connection of actuators Apply only mains voltage or only safety extra-low voltage to the switching outputs of auxiliary switches A and B. Mixed operation is not permissible. However, operation using various phases is not permissible. Include the potentiometer's electric data to indicate the damper position via external switching. Up to 10 actuators of the same device type can be electrical parallel wired.
The following diagram (example EMCO) allows for determining the total torque for this air damper type.
5 Mounting notes Mounting instructions All information and steps to properly prepare and mount the actuator are available in the mounting instructions 4 319 0108 0 (M4614) delivered with the actuator. The shaft adapter as well as all other individual parts are not pre-mounted, as the actuator components are put together differently depending on either clockwise or counterclockwise rotation of the damper shaft and damper shaft length. Refer to 2.5 "Structure and design" in this chapter.
6 Introduction Note Wiring notes Prior to wiring, study all information in the following sections: ∂ "Safety notes" in chapter 4.1, ∂ "Device-specific regulations" in chapter 4.2, ∂ "Notes on EMC optimization" in chapter 4.3, ∂ "Diagrams" in chapter 9, and the ∂ HVAC plant diagram. ∂ This chapter is written for AC/DC24 V and AC 230 V (Information for AC 24... 48 V on inquiry) 6.
Line length/consumption AC/DC 24 V The diagram applies to AC/DC 24 V and shows the permissible line length L as a function of consumption P and as a parameter of the line cross sections. 4626D02en L [m] 300 200 2.5 mm² 0.75 mm² 100 1 mm² 1.5 mm² 0.5 mm² 0 8 0 Notes on diagram P&I diagram: Voltage drop on the supply lines 16 ∂ The values in [VA, W] on the P-axis are allocated to the permissible voltage drops (ΧU/2U = 4 %) on line L as per the above table and to the P&I diagram.
The following sections show how to determine the permissible line length and cross sections for the various actuators based on examples. The examples for actuators connected in parallel apply to the following arrangement: G0 G L2 A1 L2 A2 L2 A3 L2 A4 G0 G L1 G0 G Controller G0 L1 G G0 G G0 G Assumption The line resistances of L2 are equal and can be ignored for L1. Separately calculate the permissible line lengths L2 for other connections (ring, star-like). 6.
P&I diagram: Conduction currents The diagram shows the currents in the connecting lines for one actuator. GMA13..1 2 6 7 Example: Parallel connection of two actuators 0.21 A 0.15 A 0V AC 0.21 A DC 0.15 A AC/DC 24 V AC/DC 24 V G G0 M Y1 Y2 Determining the line lengths for two actuators GMA13..1 and AC/DC 24 V supply. Only the currents in line 1 (G) and 2 (G0) determine the line sizing. Max. permissible voltage drop = 4% per line (total 8 %).
P&I diagram: Conduction currents at AC 24 V The diagram shows the currents in the connecting lines for one actuator. GMA16..1 1 2 AC 24 V AC 0.21 A 0V AC 0.21 A G G0 M Y U (DC 0...10 V) 9 Example: Parallel connection of four actuators 4614G07 8 DC 0...10 V Determining the line lengths for four actuators GMA16..1 at AC 24 V supply. Only the AC currents in line 1 (G) and 2 (G0) determine the line sizing. Max. permissible voltage drop = 4% per line.
P&I diagram: Conduction currents at DC 24 V The diagram shows the currents in the connecting lines for one actuator. GMA16..1 1 2 DC 24 V DC 0.15 A 0V DC 0.15 A DC 0...10 V DC 0.1 mA G G0 M DC 1 mA 9 Example: Parallel connection of four actuators Y U (DC 0...10 V) 4614G08en 8 Determining the line lengths for four actuators GMA16..1, GMA19...1 at DC 24 V supply. Only the DC currents in line 1 (G) and 2 (G0) determine the line sizing. Line 2 (G0): (max. voltage drop 1 %) Line 1 (G): (max.
7 References Commissioning notes All information necessary for commissioning is contained in the following: ∂ This document ("Technical basics" Z4614en) ∂ Mounting instructions 74 319 0108 0 (M4614) ∂ HVAC plant diagram. 7.1 General checks Environmental conditions Check to ensure that all permissible values as contained in chapter 8 "Technical data" are observed. Mechanical check ∂ Check for proper mounting and to ensure that all mechanical settings correspond to the plant-specific requirements.
Rotary movement: Modulating control GMA16..1 ∂ When applying a DC 10 V input signal, the actuator must turn from 0° ⇑ 90° / 90° ⇑ 0° (or to the end position of the rotary angle limitation). ∂ After interrupting the operating voltage, the actuator must return to the mechanical zero position (spring return function). ∂ After interrupting positioning signal Y, but while operating voltage is still supplied, the actuator returns to the zero position. ∂ When the actuator moves from 0...
Push button operation 7.3 Modbus 7.3.1 HMI – Human-machine interface Activity Push-button operation Confirmation Display current address Press button < 1s 1-digits: red (starting with lowest address digit) 10-digits: green 100-digits: orange If termination is switched on, LED flashes 1x blue after address display Example: 124 = 4x red, 2x green, 1x orange Turn bus termination on / off turn on 1.press 3x LED flashing and flickering stops (termination mode) 2.
Resetting the device by push button 1. 2. 3. 4. Press button for >10s → LED starts flashing orange. Release button while LED still flashes → LED keeps flashing for 3s. If the button is pressed within these 3s, the reset is cancelled. After those 3s → LED shines red (reset), then the device restarts. 7.3.2 Push button addressing The Modbus address can be set without a separate tool by using push-button and LED. To display the current address, press button <1s.
Set address “5”: 1. Enter addressing mode 2. Set 1- digit: Press button 5-times → LED flashes green per button press Store address: press button until LED shines red → address is stored and displayed 1x for confirmation 7.3.3 Commissioning Workflow 1 The devices are especially designed for using the Climatix push-button configuration as described in document A3975 1). The bus configuration can alternatively be parameterized by the local HMI, cf. page 29.
7.3.4 Modbus registers Reg. Name R/W Unit Scaling Range / enumeration Process Values 1 Setpoint RW % 0.01 0..100 2 Override control RW -- -- 0 = Off / 1 = Open / 2 = Close 3 = Stop / 4 = GoToMin / 5 = GoToMax 3 Actual position R % 256 Command RW -- 0.01 0..
Reg. Name R/W Value Example Device information 1281 Factory Index R Two bytes, each 00 5A ⇓ 00 “Z” coding an ASCII char.
7.3.5 Parameter and function description Function Reg. Description Override control 2 The actuator can be operated in override control for commissioning / maintenance purposes or system-wide functions (e.g. night-cooling). ∂ Manual override: When the gear disengagement is used to freely adjust the damper position, a mechanical jam will be detected if a mismatch between setpoint and actual position persists for more than 10s.
8 Supply, AC 24 V/ DC 24…48 V (SELV/PELV) for GMA12.., GMA13.., GMA16.. Technical data Operating voltage AC Frequency Operating voltage DC AC 24 V °20 % % or AC 24 V class 2 (US) 50 / 60 Hz DC 24…48 V °20 % DC 24 V °20 % GMA..1E/MO Safety extra-low voltage (SELV) or Protection by extra-low voltage (PELV) as per HD 384 Requirements for external safety insulating transformer (100% duty) as per EN 61 558 Supply line fuse max. 10 A Power consumption: GMA1.. : Running AC: 5 VA / 3.5 W GMA1.. : Running DC: 3.
Outputs Position indicator for GMA16..1 Feedback potentiometer for GMA132.1 Auxiliary switch for GMA..6.1, GMA164.1, Output signal (wires 9-2) Output voltage U Max. output current Protected against faulty wiring Change of resistance (wires P1-P2) Load Max. sliding contact current Permissible voltage at potentiometer (SELV/PELV) Insulation resistance between potentiometer and housing AC power supply Switching voltage Nominal current res./ind. Life: 6 A res., 2 A ind.
9 Diagrams 9.1 Internal diagrams (Q21) B (Q14) 4 S2 S3 S5 S6 GMA16..1 Modulating control AC 24 V/DC 24…48 V AC 24 V/DC 24…48 V 100% A (G) 1 8 100% B S1 (Y) GMA16..1 S4 AC 24...230 V / 6 (2) A DC 12...30 V / 2 A M A (Q11) SELV/PELV AC 24 V DC 24...48 V DC 0...10 V (Q21) S4 B 2 S5 S6 S2 S3 (Q24) 9 (Q22) (Q14) (Q12) (G0) S2 S3 (Q24) (Q12) 2 4614G04 (G0) 1 (Q22) (G) (Q14) 0% 0% (U) (Y2) S1 (Q11) (Y1) P1 P2 P3 (c) 7 (a) 6 AC 24 V...230 V / 6 (2) A DC 12.
9.3 Two-position GMA12..1, 32..1 Connection diagrams (two-pos./three-pos.) GMA121.1, GMA126.1. GMA321.1, GMA326.1 AC 24 V/DC 24…48 V (SELV/PELV) AC 230 V SP L (Q1) (Q2) AC 230 V AC 24 V / DC 24...48 V (Q1) N 1 S1 (Q2) S4 3 N S1 S4 S2 S3 S5 S6 GMA32..1 GMA12..1 Y SN N Y SP SN Y 4 S5 S6 4614A06 S2 S3 N Controller Actuator GMA12..1 System potential AC 24 V / DC 24…48 V System neutral Three-position control GMA13..1 4614A05 2 Controller Actuator GMA32..
Operating states of GMA13..1 The table below shows the actuator's operating states for three-position control in dependence of mounting position and setting of switch contacts Q1 and Q2. Controller contacts Q1 Q2 Operating state Rotary direction Remains in current position Opens Closes Closes 9.4 4614T02en Mounting position of actuator GMA13..1 Connection diagrams (modulating) 9.4.1 Typical application The controller output is connected directly to the actuator input. GMA16..
9.4.2 Special switchings for modulating control The following connections enable different operating states of the actuator depending on the position of the changeover switch featuring switch contacts K1, K2, K3 (see table of operating states below). Modulating control, fully open, fully locked with GMA16..1 AC 24 V (SELV/PELV) DC 24…48 V (SELV/PELV) SP SP (G) (G) K3 8 S1 S4 GMA16..1 N Y P SP SN D K1...K3 Operating states of GMA16..1 9 S2 S3 Controller Actuator GMA16..
9.5 Connection diagrams (networked) 9.5.1 Typical application The application controller is connected to the actuator by the bus cable. GMA161.1E/MO 10 General notes Environmental compatibility and disposal This actuator was developed and manufactured by using environmentally-compatible materials and by complying with our environmental standards.
11 Chapter contents Appendix This chapter contains: ∂ Actuator dimensions ∂ Referenced documents ∂ Standards and directives min.100 11.1 Dimensions 141 10.6 42 20 113 Dia.5 min.100 168 180 19 60 192 Taptite M6 x 16 2 Mounting bracket 30 min.100 4614M02en min.150 min.60 3 15 30 min.7 900 12 Dia. 6.4...20.5 Square 6.4...13 Dia.10.5 31.5 81 60 GMA...1 Dimensions in mm 42/44 Siemens Building Technologies GMA..
A6V101006034M01 External Modbus Interface X = 220 mm Dimensions in mm 11.2 Referenced documents Purpose of this listing The previous chapters contain all information relevant to safety and project-specific requirements, mounting, wiring, and commissioning of actuators. Documents and standards The following list contains all documents referenced by this document on basics: ∂ Data sheets (N....) with detailed specifications ∂ Basic documentation (Z....
Accessories for type series GMA...1 N4697en (N4697) N4615en (N4615) 74 319 0236 0 (M4614.1) 74 319 0237 0 (M4614.2) 74 319 0238 0 (M4614.3) 74 319 0239 0 (M4614.4) 74 319 0240 0 (M4614.5) Universal lever ASK71.9 Rotary/linear set for duct and wall mounting ASK71.11 Rotary/linear set with lever ASK71.13 Rotary/linear set with lever and mounting plate ASK71.14 Deliverables and Mounting instructions Weather protection cover ASK75.
