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© 2008 Quality In Control Pty. Ltd.

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Quality Technology Solutions
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LINEAR INCREMENTAL MEASURING SYSTEM
Meterdrive Z.301A-0

Long-distance measuring systems - Measuring and positioning up to 500 meters. Reading speed : 10 meters per second.

Robust, simple and easy to use

Suitable for high-speed measuring and positioning, available in conventional linear encoder format or as an electronic tape measure.

OPERATION
Plan of a linear encoder Z201 / Z301

The opto-electronic encoder accurately counts the number of slots in the perforated stainless steel tape at speeds up to 10m/s.

ADVANTAGES

However, Meterdrive is not just a conventional linear encoder, and offers the user significant benefits over other linear measuring systems : the stainless steel tape can be stretched between two fixed points and does not need to be fixed accurately to a flat base. In this case, the encoder is mobile. Alternatively, the tape can be coiled as in a tape measure with the encoder stationary. This solution, the Rollzam, is particularly useful if there is only one fixed point for the tape, as is the case for fork lifts, table lifts or periodic controls in nuclear power plants.

It is also possible to use the tape with a pulley and counterweight, as a belt between two pulleys, or to move the tape through the fixed encoder. This last solution can be very useful for short distances (such as pneumatic or hydraulic jacks).

NO DESYNCHRONISATION
Plan cross section of a linear encoder Z201 / Z301

The tape is guided in the encoder by 2 pairs of high-density polyethylene tape guides. Thanks to this system, the tape cannot move incorrectly, and therefore cannot lose step, as is the case with other measuring systems.

STURDINESS

Water and shock resistance, absence of mechanical parts and direct reading via large tape perforations ensure that the system has excellent life and wear characteristics.

RELIABILITY

Meterdrive is particularly useful as a replacement for conventional chain arrangements, pulleys, etc, where roller slip or wear can cause loss of positioning when using rotary encoders.

HOW DOES IT WORK ?

Inside the encoder are 4 light-emitting diodes opposite 4 light-receiving diodes. The tape slides through the encoder, supported by polyethylene tape guides, and the receiving diodes are alternately covered and uncovered by the perforated tape. The encoder emits two incremental 90° phase-shifted signals (A & B). A warning signal E is emitted should the tape perforations become obstructed by dirt particles or if the power supply is insufficient.

The output signal can be used with any PLC or proprietary counter. Counters and PLCs have to take all edges of signals A & B into account (multiplication by 4) and must have an external reset. In order to use the high speed operation available with Meterdrive, counters and PLCs must have a counting frequency of 5kHz per channel for Z.201 encoders (1mm resolution) and 50kHz per channel for Z.301 encoders (0,1mm resolution).

TECHNICAL CHARACTERISTICS OF THE ASYMETRIC SIGNAL ENCODERS
  • Infrared optical measurement
  • Polycarbonate case injected with fibers, completely sealed, light, compact, robust and without moving parts, unaffected by shocks and vibrations.
  • Reading speed 10 m/second
  • Protection IP 67
  • Version connector, Weight : 90g. Version cable : 350g.
  • Power supply 10-30V DC

 

  • Power consumption 80mA max
  • Incremental output signals A, B and error signal E.
  • Working temperature : -20 to +60°C
  • Storage temperature: -40 to +85°C
  • Protection against static electricity : 1000V, 100pF, 100 ohms
  • Protected against polarity inversions, short-circuit of output signals against each other, 0V, +V

 

Asymmetric signal encoders

A-B-E – connector connection

Symmetric signal encoders

A-A’-B-B’-E-E’ – 2m cable connection

Asymetric signal encoders Z.201A-0
Asymetric signal encoders Z.301A-0

Z.201A-0

1mm Resolution

Z.301A-0

0,1mm Resolution

Symetric signal encoders Z.201S
Symetric signal encoders Z.301S

Z.201-S

1mm Resolution

Z.301-S

0,1mm Resolution

Output circuit: Push-pull asymetric against 0V

Output tension: 10-30V proportional to power supply

Connection: airtight 5-pin connector for shielded 5-conductor cable (exterior cable Ø 5mm).

Output signals: RS422 driver

Output level 0 : 0,5V max

Ouptut level 1 : 2,5 V mini

Max. load: 10mA per channel

Connection: 2m PVC cable : 8 wires, 4 shieldings, exterior Ø 9mm.

Wiring ; view soldered side
Plan of the connection

Wiring ; view soldered side

Plan of the connection

Vectral can also supply 2m, 5m or 10m cables with fitted male or female plugs for direct connection to our counters.

Tape Z.200 – Z.300

The stainless steel tape is very flexible. making detailed adjustments unnecessary and thus facilitating use of the system (reduced time for engineering departments, installation,….). Thanks to the large size of its perforations (2mm), it is immune to almost all industrial environments.

 

The tape is usually stretched between two points. Up to 15m, no mid support is required. Over this length, a support should be positionned every 3-4 meters, or the tape should rest on a profile support for its entire length. When the encoder moves, it raises the tape approximately 20mm as it passes (1/2 the depth of the encoder with some leaway). When used with production machines, we suggest covering the tape with a U -profile to protect it from projections and chips.

Tape for Linear encoder Meterdrive

Tape for Linear encoder Meterdrive

Two types of tape are available

  • The Z.200 tape is intended for our Z.201 encoders, 1mm resolution. It is manufactured with an accuracy of ±0,1mm/meter.
  • The Z.300 tape is manufactured with an accuracy of ±0,03mm/m. It is the ideal choice for use with our Z.301 encoders if garanteed measures are necessary (ie. metrology).

 

All of our tapes are manufactured to attain their maximum precision with a tension of 50 Newtons, which can be easily applied with our Z.215 tension system.

 

For applications not requiring metrology but simply needing a positionning repeatability of 1/10thmm, it is possible to use our more economical Z.200 tape with the Z.301 encoders.

Technical characteristics

Tensile strength

Elasticity limit

Expansion coefficient

Stress deformation

Weight

Thickness

Maximum length

Precision :

   Z.200

   Z.300

Minimum bending radius

Length minimum for the fixation

2000 Newtons

1000 Newtons

16 µ/m/°C

3,2 µ/m/N

18 g/m

0,2mm

500m.

 

± 0,1 mm/m à 50N et 22°C

± 0,03 mm/m à 50N et 22°C

5 cm

8 cm

Two systems exist to attach the tape ends

An economic system Z.202 including the 2 pairs of stainless steel plates and the spring Z.203.

A rapid mounting system, Z.215, enables tension adjustment with a compression spring for optimal precision. It can can be bolted to a support in any direction (x, y or z) with just 4 screws.

Plan of the economic system Z.202 & Z.203
Plan of the rapid mounting system  Z.215
Economic system Z.202
Rapid mounting system Z.215
ROLLZAM

The Rollzam comprises the flexible tape coiled inside a housing and a spring to automatically rewind the tape. The detector head is thus static, protected against the environment, and gives the following benefits : easy mounting, fixed cabling, no tape support required. Standard length : 8 or 15m. The Rollzam base unit can be fitted with any of our (either the Z.201 or Z.301) encoders.

 

Ideal for : telescopic systems, measuring heights or levels……

Photo of Rollzam

Plan of Rollzam 213/8

Rollzam 213/8

    Rollzam 213/8 : 8 meters long

 

    Rollzam 223/15 : 15 meters long

 

 

 

 

The means to measure long lengths at high speeds ........
Meter Drive Linear Incremental Tape Encoder