Came SMA2 User Manual

SMA2

English

SERIES R ACCESSORIES

MAGNETIC LOOP

CONTROL DEVICE

SMA2

nglis

SERIES R ACCESSORIES

MAGNETIC LOOP

CONTROL DEVICE

The data and information reported in this installation manual are susceptible to change at any time and without obligation on CAME cancelli automatici s.p.a. to notify users.

Pag.

2 - Manual code:

119R V04

119 RV 04 ver.

0.1

0.1 03/2009 © CAME cancelli automatici s.p.a.

ENGLISH

ELECTRIC SPECIFICATIONS

Supply voltage 12/24 V ac/dc

Current draw 20 mA max

Outlet relays Max capacity: 5 A at 230 Vac - Closed contact

Magnetic loop inductance Between 20 and 1000 μH

2. TECHNICAL FEATURES

The 1 channel SMA sensor is a vehicle detector using electromagnetic loops. It is fitted with a microprocessor and has been designed for access and traffic flow controls

The operating principle involves measuring the inductance variation in the magnetic loop caused when a vehicle passes over it.

Inside the sensor, the measuring circuits for the two channels are multiplied to limit oscillations and interference that could be formed between the magnetic loops.

SMA is complete with an 11-pin support/terminal block for connection to the loops and the 12 or 24 Vac/dc power supply.

Support

Sensor

1. DESCRIPTION

The data and information reported in this installation manual are susceptible to change at any time and without obligation on CAME cancelli automatici s.p.a. to notify users.

Pag.

2 - Manual code:

119R V04

119 RV 04 ver.

0.1

0.1 03/2009 © CAME cancelli automatici s.p.a.

ENGLISH

ELECTRIC SPECIFICATIONS

Supply voltage 12/24 V ac/dc

Current draw 20 mA max

Outlet relays Max capacity: 5 A at 230 Vac - Closed contact

Magnetic loop inductance Between 20 and 1000 μH

2. TECHNICAL FEATURES

The 1 channel SMA sensor is a vehicle detector using electromagnetic loops. It is fitted with a microprocessor and has been designed for access and traffic flow controls

The operating principle involves measuring the inductance variation in the magnetic loop caused when a vehicle passes over it.

Inside the sensor, the measuring circuits for the two channels are multiplied to limit oscillations and interference that could be formed between the magnetic loops.

SMA is complete with an 11-pin support/terminal block for connection to the loops and the 12 or 24 Vac/dc power supply.

Support

Sensor

1. DESCRIPTION

The data and information reported in this installation manual are susceptible to change at any time and without obligation on CAME cancelli automatici s.p.a. to notify users.

Pag.

3 - Manual code:

119R V04

119 RV 04 ver.

0.1

0.1 03/2009 © CAME cancelli automatici s.p.a.

ENGLISH

MECHANICAL SPECIFICATIONS

Materials ABS plastic casing

Fastenings Pressure sensor on the connector; connector mounted on DIN guides or screw in place

Measurements LxHxP 42 x 78 x 103 mm (sensor + connector)

Weight 230 g

Operating temperature -40 / +70 °C

Protection rating IP30

FUNCTIONAL SPECIFICATIONS

Sensitivity

4 ranges, selected through 2 dipswitches:

- High sensitivity: 0.02%, L/L

- Medium-high sensitivity: 0.05%, L/L

- Medium-low sensitivity: 0.10% L/L

- Low sensitivity: 0.50% L/L

Working frequency

High or low frequency, selected from a dipswitch; the frequency level depends on the size of the magnetic loop

Output impulse length 200 ms

Response time 100 ms

Visual indicators

- 1 red power on led

- 2 green leds for sensor activities

Relay outputs 2 “presence” mode outputs

The data and information reported in this installation manual are susceptible to change at any time and without obligation on CAME cancelli automatici s.p.a. to notify users.

Pag.

3 - Manual code:

119R V04

119 RV 04 ver.

0.1

0.1 03/2009 © CAME cancelli automatici s.p.a.

ENGLISH

MECHANICAL SPECIFICATIONS

Materials ABS plastic casing

Fastenings Pressure sensor on the connector; connector mounted on DIN guides or screw in place

Measurements LxHxP 42 x 78 x 103 mm (sensor + connector)

Weight 230 g

Operating temperature -40 / +70 °C

Protection rating IP30

FUNCTIONAL SPECIFICATIONS

Sensitivity

4 ranges, selected through 2 dipswitches:

- High sensitivity: 0.02%, L/L

- Medium-high sensitivity: 0.05%, L/L

- Medium-low sensitivity: 0.10% L/L

- Low sensitivity: 0.50% L/L

Working frequency

High or low frequency, selected from a dipswitch; the frequency level depends on the size of the magnetic loop

Output impulse length 200 ms

Response time 100 ms

Visual indicators

- 1 red power on led

- 2 green leds for sensor activities

Relay outputs 2 “presence” mode outputs

The data and information reported in this installation manual are susceptible to change at any time and without obligation on CAME cancelli automatici s.p.a. to notify users.

Pag.

4 - Manual code:

119R V04

119 RV 04 ver.

0.1

ENGLISH

3.1. Operating principles

The inductive loop sensor detects the presence of a vehicle on the surface marked out by a cabled loop, formed of 2 or more runs of leads beneath the road surface.

When a vehicle goes over the loop the relative inductance measured by the sensor is reduced.

This detection activates a relay and its contacts are used to guide the external devices.

The magnetic loop and the loop tail must be formed of a simple isolated lead, without any connections, in multithread copper, with a minimum section of 1.5 mm

(16 AWG).

It is not advisable to make connections to the magnetic loop or to the power pack. However, if it is unavoidable they must be welded and isolated in a waterproof case.

This is very important to guarantee long lasting detection reliability.

3.2. Operating limits

3.2.1. Use of adjacent SMA sensors

When the magnetic loops are too close to each other, the respective magnetic ﬁ elds could overlap and disturb the detection or damage the sensors.

There are various solutions to prevent this:

- use different frequencies for each magnetic loop.

- keep the two groups of loops at least 2 meters away from each other.

3.2.2. Interference caused by metal masses

If there is any metal under the loops, especially if they are laid in reinforced concrete, it reduces the impedance and consequently the sensitivity of the sensor.

To compensate this reduction, two turns can be added to the detection loop.

Otherwise provide a minimum space of 150 mm between the magnetic loop and the reinforcing.

If the loop tail is channelled with other cables, ensure that they are screened.

Clean and dry the cable duct before laying the cable.

3. INSTALLING THE MAGNETIC LOOPS

The data and information reported in this installation manual are susceptible to change at any time and without obligation on CAME cancelli automatici s.p.a. to notify users.

Pag.

4 - Manual code:

119R V04

119 RV 04 ver.

0.1

ENGLISH

3.1. Operating principles

The inductive loop sensor detects the presence of a vehicle on the surface marked out by a cabled loop, formed of 2 or more runs of leads beneath the road surface.

When a vehicle goes over the loop the relative inductance measured by the sensor is reduced.

This detection activates a relay and its contacts are used to guide the external devices.

The magnetic loop and the loop tail must be formed of a simple isolated lead, without any connections, in multithread copper, with a minimum section of 1.5 mm

(16 AWG).

It is not advisable to make connections to the magnetic loop or to the power pack. However, if it is unavoidable they must be welded and isolated in a waterproof case.

This is very important to guarantee long lasting detection reliability.

3.2. Operating limits

3.2.1. Use of adjacent SMA sensors

When the magnetic loops are too close to each other, the respective magnetic ﬁ elds could overlap and disturb the detection or damage the sensors.

There are various solutions to prevent this:

- use different frequencies for each magnetic loop.

- keep the two groups of loops at least 2 meters away from each other.

3.2.2. Interference caused by metal masses

If there is any metal under the loops, especially if they are laid in reinforced concrete, it reduces the impedance and consequently the sensitivity of the sensor.

To compensate this reduction, two turns can be added to the detection loop.

Otherwise provide a minimum space of 150 mm between the magnetic loop and the reinforcing.

If the loop tail is channelled with other cables, ensure that they are screened.

Clean and dry the cable duct before laying the cable.

3. INSTALLING THE MAGNETIC LOOPS

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