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  • 1

    Automatic sash controllersChapter 4.0

    LabSystem Planning Manual Air technology for laboratories

    4.0LabSystem

    Automatic sash controllers

    Table of contents

    Section Title Page1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.1.1 Additional safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

    2.1 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

    3.1 Additional energy savings . . . . . . . . . . . . . . . . . . . . . . . . . 23.1.1 Easy installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

    4.1 Drive unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.1.1 Current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.1.2 Automatic self-adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.2 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.2.1 Network connection via field bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.2.2 Time extension button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

    5.1 Functional diagram SC500 sash controller . . . . . . . . . . . . . . . . . . 45.2 Schematic diagram SC500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.2.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.2.2 CPU set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.2.3 Two independent watchdog circuits . . . . . . . . . . . . . . . . . . . . . 55.3 Terminal diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.4 Performance features SC500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

    6.1 Product overview sash controller . . . . . . . . . . . . . . . . . . . 8

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    Automatic sash controllersChapter 4.0

    LabSystem Planning Manual Air technology for laboratories

    1.1 Introduction

    With the SC500 automati c sash controller SCHNEIDER Elektronik offers a product for additional safety and energy savings in the laboratory.

    1.1.1 Additional safety

    A passive infrared movement detector (PIR) constantly monitors the work area in front of the fume hood. If no operating personnel is directly in front of the fume hood, the fully automatic closing process of the sash is started after an adjustable closing delay time (10 seconds to 30 minutes).

    The containment of a fume hood is at its highest when the sash is closed. In addition, significant energy savings can be achieved if the exhaust air volume flow is simultaneously reduced by use of a fume hood controller (e.g. FC500 or iCM). The containment safety of the fume hood is improved and additionally the energy savings potential is fully exploited.

    2.1 Functional description

    With the UP, DOWN and STOP buttons on the PAN100 operating panel, the sash is activated electrically and the motor carries out the desired movement. The connection of a foot switch makes it possible for users to automatically open the sash using their foot. This option makes sense if the laboratory personnel cannot change the sash position with their hands, for example, because they are carrying an object in both hands.

    If the sash is manually pushed in the direction UP or in the direction DOWN, the internal touch sensor (only when activated) automatically recognizes the desired direction and opens or closes the sash via the motor.

    An infrared light barrier IRL100 mounted on the sash handle bar automatically stops the sash if an obstacle is detected during the closing process. Objects, such as measuring probes, electrical cables, etc., that lead out of the fume hood are recognized with a resolution of 1mm. It is essential to cover transparent glass bulbs in the detection range of the infrared light barrier, as these can otherwise not be detected.

    Manual movement of the sash is possible at all times. This also applies to manual intervention in the closing process. Restrictive obstacles are recognised by constant monitoring of the current of the drive unit. As soon as the sash runs into a restrictive obstacle, the current consumption is increased and results in shut-off of the electrical drive unit.

    The motor-driven drive unit consists of the cable deflection pulleys and the drive roller as well as a maintenance-free servo motor and a safe magnetic clutch.

    3.1 Additional energy savings

    When the operating personnel has left the fume hood work area, the internal timer for the automatic closing process is started. The delay time until the motor driven closing process begins is freely programmable from 10 seconds to 30 minutes.

    Movements in front of the fume hood are recognised by the passive infrared movement detector (PIR) and result in a reset of of the internal timer. Automatic closing of the sash is thus only initiated when the internal timer has elapsed without interruption, i.e. if no laboratory personnel was present in front of the fume hood within the programmed delay time.

    The FC500 or iCM fume hood controllers immediately reduce the exhaust air volume flow, while ensuring minimal escape of contaminants. The required exhaust air volume flow (sash = SHUT) can be reduced, depending on the requirement by about 70 % in relation to the maximum exhaust air volume flow (sash= fully OPEN). A fume hood with a required exhaust air of 500 m3/h when the sash is fully open can be reduced to an exhaust air volume flow of 150 m3/h when the sash is fully shut without compromising safety.

    3.1.1 Easy installation

    The SCHNEIDER FC500/iCM fume hood controllers and the SC500 automatic sash controller ideally complement one another. The SC500 is suitable for fitting in all fume hood models and constructions and is thus ideally suited for retrofitting.

    Figure 4.1: SC500 automatic sash controller

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    Automatic sash controllersChapter 4.0

    LabSystem Planning Manual Air technology for laboratories

    4.1 Drive unit

    The drive unit consists of an electrical motor and an encoder, which passes the current actual value position of the sash to the control electronics. Switching from fast to slow movement and the stopping points (SHUT, 50 cm and OPEN) can now be calculated.

    The drive unit is available in two different models. The sash can be driven by both the sash cable and by a drive belt. The sash cable is driven via rubber rollers (friction drive) while the drive belt is driven over a toothed belt disk on the drive unit.

    The photos on this page show a drive unit that is driven by a drive belt. The front view and the side view with the socket for the encoder and motor cable are displayed.

    4.1.1 Current limitation

    The current consumption of the drive unit is monitored when the sash is automatically opened or closed. If the sash touches an obstacle or cannot move smoothly, the current consumption of the motor increases. As soon as a freely programmable current threshold (maximum threshold value) is exceeded, the motor immediately switches off. This protection circuit offers additional safety for the user.

    4.1.2 Automatic self-adjustment

    The limit switch SHUT records the sash closed status. In this position the encoder is automatically adjusted. This corrects any slack that may arise (rubber roller drive) and the sash always moves smoothly into the SHUT position.

    4.2 Programming

    Programming, such as the delay time of the internal timer, current threshold, light barrier type, etc., is done with the SCHNEIDER SVM100 (handheld terminal) or with a laptop and the PC2500 software.

    All parameters can be configured on site in accordance with the users' needs.

    With the PC2500 software all parameters can also be saved and printed.

    4.2.1 Network connection via field bus

    The SC500 automatic sash controller can easily be integrated in a network via a field bus module on the fume hood controller (e.g. FC500). This ensures that connection to the building services management is possible. Thus, the sash can easily be closed automatically when a fire or smoke alarm is activated. Remote maintenance via the network is also easy and efficient to implement.

    4.2.2 Time extension button

    By pressing the TIME EXTENSION button the lowering delay time of the sash is extended by a programmable time period (1...30 minutes). By repeatedly pressing this button the time period is summed up internally (max. 4 additions).

    If, for example, the fume hood must be equipped with new devices or if the sash should not be closed for a prolonged period, it makes sense to use this function. A maximum extension of the lowering delay time of 4 x 30 minutes = 2 hours may be achieved.

    Figure 4.2: Front view of the drive unit with rubber roller

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    Automatic sash controllersChapter 4.0

    LabSystem Planning Manual Air technology for laboratories

    5.1 Functional diagram SC500 automatic sash controller

    The functional d

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