LabSystem Automatic sash controllers - Schneider Elektronik · LabSystem Automatic sash controllers ... Manual movement of the sash is possible at all times. This also applies to

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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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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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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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5.1 Functional diagram SC500 automatic sash controller

The functional diagram in Figure 4.4 shows how the SCHNEIDER SC500 automatic sash controller works. See Chapter 2.1, page 2 for the functional description of

the SC500 automatic sash controller.

Passive infrared movement detector

Figure 4.4: Functional diagram SC500

Figure 4.5: Fume hood with passive infrared movement detector, factory picture: Wesemann

Fumehood

1

UPSTOPDOWN

2 SC500

CLOSED

34 5

M

6

Fault alarm

230 VAC Power

1 Passive-Infrared-Detection PIR

Control panel

3 Light barrier transmitter

4 Light barrier receiver

5 Limit switch CLOSED

6 Motor drive unit 24 VDC

2

F1 F2 F3

1 2 3

4 5 6

7 8 9

* 0 ,

Service moduleSVM100

Laptop

RS 232

RS485

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5.2 Schematic diagram SC500

Figure 4.6 shows the schematic diagram of the entire SC500 automatic sash controller.

5.2.1 Power supply

All SCHNEIDER products have their own 230V AC power supply, which eliminates the need for a 24V AC power supply via an external transformer. The integrated power supply makes planning easier, generates no additional costs and considerably improves system safety and stability of the electronics. With an external 24 V power supply the entire supply line would fail in the case of a short circuit or other defect.

5.2.2 CPU set-up

The CPU consists of a microcontroller with integrated RAM (Random Access Memory), a ROM (Read Only Memory) for the application software, a UART (Universal Asynchronous Receiver Transmitter), internal timers, Input/Output-Ports and an A/D (Analogue/Digital converter).

In addition to a CPU kernel, there is also a D/A (Digital/Analogue converter) as well as an input and an output interface on the control board. The peripheral sensors and acutators are connected to the corresponding port cables.

The parameters are saved mains voltage failure-free in the EE-PROM.

5.2.3 Two independent watchdog circuits

The SC500 controller hardware has two independent watchdog circuits. The microcontroller is checked for errors at regular intervals and in the case of an error in the CPU, one or both of the watchdog circuits trigger a hardware reset, which restarts the CPU. This unique watchdog concept additionally increases operating safety.

Figure 4.6: Schematic diagram SC500

Backupbatterie

CPU

Watchdog 1

Timer

UART

ROM/RAM

Output

Input

RS 232

Relay

TTL

TTL

Optocoupler

EE-PROMWatchdog 2

I/O

Serial interface

Relay: Alarme

TTL: Actuator

TTL: Sash sensor Button Up/Down Foot-button Light barrier Passive-infrared- sensor

OC: Up Down

230/115 V ACPower supply

Voltage

GND +5V +12V

Input

LON-Network FTT-10A

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5.3 Terminal diagram SC500 Figure 4.7 shows the terminal diagram of the SC500 automatic sash controller and the wiring plan.

All cables are pre-assembled and fitted with screw terminals. When mounting, you only have to plug the screw terminals into the slots provided and the wiring is complete. This ensures that wiring is easy, cost-efficient and error-free.

The following points must be completed when carrying out the wiring:

1. Connection of the electrical motor and the encoder cable to the drive unit and plug X8.

2. Connection of the passive infrared sensor to terminal X3 (ensure the correct polarity).

3. Connection of the UP and DOWN (and possibly STOP)

to terminal X6.

4. Connection of the foot switch (optional) to terminal X6.

5. Connection of the IRL100 light barrier to terminal X4.

6. Connection of the limit switch "Sash DOWN" (not included in the scope of delivery) to terminal X5.

7. Connect the 230 VAC to terminal X1.

After the self-test the set-up is complete and the automatic sash controller functions automatically.

5.3.1 Scope of delivery SC500 automatic sash controller

The SC500 automatic sash controller (full construction) in-cludes the following components:

5

3

7

1

2

46

Pos. Number Object1 1 Control electronics in casing with integrated power supply (230V AC)2 1 Motor drive unit with clutch3 1 3m connection cable motor drive unit4 1 Passive infrared sensor5 1 Infrared light barrier emitter/receiver for registering objects during the closing

process 6 1 Additional fitting: Operating panel UP/STOP/DOWN (please order separately)7 1 Additional fitting: Foot switch for opening the sash (please order separately)

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Figure 4.7: Terminal diagram SC500

TER

MIN

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ash

cont

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Rev

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12

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SC50

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ctor

PE

X2

K1

Rel

ay 1

32 33

X6

1618

1719

2022

2123

2426

2527

2830

2931

Lapt

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F2F3

12

3

45

6

78

9

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Ser

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mod

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X 8

RS

232

Cab

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Mot

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3435

3637

3839

RS4

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RS4

85-2

X9JP

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SC

500

Con

trol

ler

F1 T 50

0mA

/250

VT

1A/1

15V

F2 T 3,

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V

X10

X11

X12

Set v

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fum

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olle

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.: 23

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15V

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: JU

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ON

Ligh

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ith o

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OFF

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ith 2

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(inte

rnal

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: LIM

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and

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ller A

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on:

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SUPP

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AC

SUPP

LY 1

15V

AC

PIR

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6.1 Product overview automatic sash controllers

The diagram shows an overview of the products that are available from SCHNEIDER in the product group Sash controllers.

See Chapter 1, Section 6.1 for the full LabSystem product overview.

Technical data sheets, further information and tender specifications for the SC500 automatic sash controller are available for download on the Internet at www.schneider-elektronik.de.

Figure 4.8: Automatic sash controller SC500

Product group Product Short description Chap-ter

Automatic sash closing systems

SC500 Touch control mode for UP and DOWN, light barrier for obstacle recogniti-on during the closing process

4.0

5.4 Performance features SC500

Microprocessor controlled automatic closing system for fume hood sashes

Integrated power supply 230V AC All system data are saved mains voltage failure-safe

in the EEPROM Programming of all system values via service module

SVM100 or laptop computer software PC2500 Automatic adjustment of the sash position via buttons

(UP, DOWN, STOP), foot switch or manually Automatic adjustment of the sash position directly via

touch control mode on the window (UP, DOWN) 10 freely selectable speeds with soft stop Motor current control with automatic shutoff (manual

intervention) Monitoring of closing time Teach-in mode for easy commissioning of different

fume hood types start of the closing process by passive infrared

movement detector Monitored closing process via infrared light barrier

and automatic shutoff on obstruction recognition Reduced cabling effort through the use of a 2-wire

light barrier using both sash cables is possible Lowering delay time adjustable from 10 sec to 30 min Optionally connectable time extension button for

extending the lowering delay time (fume hood setup) Automatic, electronic adjustment of the drive when

free movement of the sash is changed Progamming of the system via the FAZ on the fume

hood (RS 485 – together with the FC-500 controller) improvement in safety and reduction of the air

requirement by the predominant operating state sash closed

Suitable for all fume hood constructions, independent of the opening or closing method

Documents

LabSystem Automatic sash controllers - Schneider Elektronik · LabSystem Automatic sash controllers ... Manual movement of the sash is possible at all times. This also applies to