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Table Of Contents

Designation
- Type reference

A6V10888424en

2016-12-05

Building Technologies

OpenAir

Actuators for Fire and

Smoke Protection Dampers

GRA126.1E/...

GRA326.1E/...

• Electric motor driven actuators for 2-position control, nominal torque

4 Nm, with spring return to failsafe position, mechanically adjustable

span between 0...90°, prewired with 0.9 m long connecting cables

• Operating voltage AC 24 V / DC 24…48 V or AC 230 V

• Optional temperature monitoring unit with 3 thermal cutouts (72 °C) and

test button

• Fixed auxiliary switches for switching points 5° and 80°

• Rigid connection between actuator and damper shaft

Use

For the control of fire and smoke protection dampers.

• Nominal torque of 4 Nm for damper surfaces up to about 0.6 m

(friction-dependent)

• In fire protection sections of plant where, in the event the thermal fuse cuts out at a

duct or ambient temperature of 72 °C, or in case of a power failure, the actuator

must travel to the failsafe position (zero position)

Summary of content (12 pages)

PAGE 1
OpenAirTM Actuators for Fire and GRA126.1E/... Smoke Protection Dampers GRA326.1E/... • Electric motor driven actuators for 2-position control, nominal torque 4 Nm, with spring return to failsafe position, mechanically adjustable span between 0...90°, prewired with 0.
PAGE 2
Functions Basic functions Rotary movement • Direction of rotation (clockwise or counterclockwise) determined by the way the actuator is mounted on the damper shaft • When operating voltage is applied, the actuator travels toward the 90° position Failsafe function • If the thermal fuse cuts out at a duct or ambient temperature of 72 °C (Optional: 95 °C), the return spring drives the actuator to the failsafe position (0°) • In the event of a power failure or if the operating voltage is turned off, the retu
PAGE 3
Technical design Drive motor The brushless DC motor ensures accurate speed control, torque monitoring for protecting the actuator and the air damper, and provides a reliable failsafe function. Spring return mechanism in the event of power failure Mechanical spring ensure the failsafe function. Mechanical design Basic components Housing Robust, lightweight all metal housing made from die-cast aluminium which guarantees a long service life even under extreme environmental conditions.
PAGE 4
Refer to "Technical design" and "Commissioning notes" in this Data Sheet. Setting and operating elements Arrangement for shaft adapters 8 1 Housing 2 Angle of rotation scale 0°...
PAGE 5
Engineering notes The basic system data for the control systems in use contain all engineering notes. Read all the engineering notes before mounting, wiring and commissioning the damper actuator and pay special attention to all safety instructions. STOP Correct use These damper actuators must be used on applications as described in the basic system data documents for the relevant control systems.
PAGE 6
Damper shafts For information on minimum length and diameter of the damper shaft, refer to "Technical data". Spring preload The actuator is supplied with a 5° spring preload to ensure a certain closing pressure for the air damper. Mechanical limitation of the rotational angle If required, the angle of rotation can be limited in increments of 5° for the entire correcting span by placing the shaft adapter in the respective position.
PAGE 7
Technical data Power supply AC 24 V DC 24...48 V (SELV/PELV) Operating voltage AC / frequency Operating voltage (DC) Power consumption GRA126.1: when running when holding Safety class AC 24 V ±20 % / 50/60 Hz DC 24...48 V ±20 % AC: 5 VA / 3.5 W / DC: 3.5 W AC/DC: 2 W III to EN 60 730 Power supply AC 230 V Operating voltage / frequency AC 230 V ±15 % 50/60 Hz 7 VA / 4.5 W 3.5 W II to EN 60 730 Power consumption GRA326.
PAGE 8
Temperature monitoring unit (ready connected to actuator GRA..26.1E/T..) 0.9 m long (2 x 0.5 mm2) Tf1: outside the duct 72 °C Tf2: inside the duct 72 °C Tf3: inside the duct 72 °C 72 °C +0 °C/–2 °C III (safety extra-low voltage) IP54 –20…+50 °C/–20…+50 °C KL D to DIN 40040 maintenance-free 0.
PAGE 9
Connection diagram GRA126.1E/.. AC 24 V DC 24…48 V (SELV/PELV) N Controller Y 2-position actuator SP System potential SN System neutral GRA326.1E/.. AC 230 V N Controller Y 2-position actuator L Live N Neutral conductor 9/12 Siemens Building Technologies Actuators for fire and smoke protection dampers GRA126.1E/.., GRA326.1E/..
PAGE 10
Dimensions Actuator 10,6 141 20 28 113 5 168 180 Ø 10,5 81 60 Ø 4620M01 Temperature monitoring unit Taptite M6 x 16 178 12 8/10/12/15 19 2 LED function š Red = Operating voltage OK Thermo sensor defect š Green = Operating voltage OK Thermo sensor OK ˜ Dark = No operating voltage Dimensions in mm 10/12 Siemens Building Technologies Actuators for fire and smoke protection dampers GRA126.1E/.., GRA326.1E/..
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/12 Siemens Building Technologies Actuators for fire and smoke protection dampers GRA126.1E/.., GRA326.1E/..
PAGE 12
Issued by Siemens Switzerland Ltd Building Technologies Division International Headquarters Gubelstrasse 22 6301 Zug Switzerland Tel. +41 41-724 24 24 www.siemens.com/buildingtechnologies © Siemens Switzerland Ltd, 2016 Technical specifications and availability subject to change without notice. 12/12 Siemens Building Technologies Actuators for fire and smoke protection dampers GRA126.1E/.., GRA326.1E/..