Download EMIX3 - S M Bown Electrical Ltd

EMIX3 series
Magnetic Linear Encoder
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Non-contacting measurement
With periodic index pulse
Resolution 0.01 mm (at 4 edge triggering)
Repeat accuracy +/- 1 increment
Speed proportional real time square wave output
Ideal for hostile environments
Only functional with an ELGO MB20-20-10-1-R magnetic tape!
EMIX3-000-E_11-06.doc
Doku Art. Nr. 799000129
1. METHOD OF OPERATION
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2. EMIX3 SENSOR WITH INTEGRATED TRANSLATOR
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3. POWER SUPPLY / OUTPUT LEVELS
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4. DIMENSIONS
5
5. TECHNICAL SPECIFICATIONS
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6. INSTALLATION OF EMIX3
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6.1 Installation with magnetic tape
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6.2 Installation with magnetic rings resp. Pole wheels
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6.3 Hade tolerances of sensors
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6.4 Installation place
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6.5 Supply voltage
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6.6 Fault clearance
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7. THE MAGNETIC TAPE MB20-20-10-1-R
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7.1 Technical specifications of the tape
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8. TYPE DESIGNATION EMIX3
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9. LIABILITY EXCLUSION / GUARANTEE
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1. Method of Operation
E MIX3 converts the sinusoidal magnetic signal, produced by the magnetised
rubber tape, into a differential 90° shifted square wave signal (A / A’ and B /
B’) and further a periodic index pulse (Z / Z’). The output signal has an equal
mark-space-ratio, inversely proportional to speed.
Sensing System
The EMIX3 sensor housing includes the sensing technology, translator and also the
periodic index pulse. The magnetic pole pitch is 5 mm and the LMIX electronics interpolates the sine wave which results in the system resolution.
Standard features :
• Final resolution 0.01 mm (using 4 times edge multiplier)
• Power supply is 5 VDC or 10-30 VDC
• Output 10-30 VDC ore 5V-TTL line driver
• Complementary output signals
• Index pulses at regular intervals of 2 mm
• Measurement capability up to 32 m
Important: To achieve 0.01 mm resolution, it is necessary to select
4 edge trigger mode at the connected unit (e.g. indicator or controller).
Output Pulse Diagram of EMIX3
A
A
B
B
Z
Z
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2. EMIX3 sensor with integrated translator
The active sensor side is designated by a mark.
Hint: when using 5V signals with complements, fit a 120 Ohm termination resistor at the controller end, across each pair of cables, to prevent cross talk and signal distortion.
It is also possible for very short cable runs only, to incorporate the 120 Ohm resistors within
The EMIX head. This feature must be specified at order stage.
Wiring / Connections
Screen
A
EMIX
PLC
PC
CNC
A
4
Function
0V
5 Volt /10-30V
Channel A
Channel B
Index mark Z
Channel A'
Channel B'
Index mark Z'
Colour
white
brown
green
yellow
black
violet
orange
grey
3. Power supply / Output levels
The following combination of supply and output levels are deliverable:
1. Order index 00* = supply voltage 10 - 30 V / output level 10 - 30 V
2. Order index 01* = supply voltage 10 - 30 V / output level TTL Line Driver
3. Order index 11* = supply voltage
5 V / output level TTL Line Driver
* Order index (see type designation)
Voltage drop referring to wire length (only with supply voltage 5 VDC)
(signal cable)
Cross section
2
0.14 mm
0,35
0,3
Vol
t 0,25
Dr
0,2
op
in 0,15
vol
ts 0,1
Note: To reach the largest possible interference
distance it is recommended to supply the magnetic
length system EMIX2 with 10-30 VDC and to select
the A/B signals TTL-compatible (5V) (Index 01)
and to evaluate them differential.
Cross2section (power cable)
0.7 mm
0,05
0
1
2
3
4
5
6
7
8
9
10
Cable length in m
4. Dimensions
4
Rear
50
42
24
6
4
Cable entry
26
9
0.8 mm
4
41
1.8
Maximum gap between Sensor and tape is 0.8 mm
Fixing holes diameter = 3.3 mm
All dimensions shown are in mm
5
Tape
5. Technical specifications
Specification
Mechanic
Measurement principle
Translator location
Outer dimensions of sensor head
Resolution at 4 edge multiplier
Repeat accuracy
Accuracy in mm (at 20 ° C)
Mounting distance to the tape
Housing material
EMIX3 Sensor
Unguided
Incremental
Integrated
56L x 24W x 26H mm
0.01 mm
+/- 1 Increment
+/- (0.01 + 0.02 x L*) * L = Measuring length in meters
max. 0.8 mm
Zinc die cast
IP 43 (Standard)
Protection class
IP 67 (Option V)
Working temperature
0... + 60 ° C
Service temperature
- 20... + 70 ° C
Stock temperature
- 40... + 85 ° C
Humidity
max. 80 % not condensing
Outputs
push / pull - short circuit proof
Output levels
10-30 V or 5 V-TTL
Output currency per channel
20 mA
Index pulse
the pulse time depends on operated speed
DC - Power supply
10-30 V +/- 10 % oder 5 V +/- 2,5 %
Allowed ripple (Power supply)
max. 5 % at 10-30 V resp. < 50 mV at 5 V
Consumption
150 mA at 10-30 V resp. 200 mA at 5 V
Output frequency (10... 30 V-HTL lev100 KHz per channel A or B at optimal evaluation
Operating speed (10... 30 V-HTL lev 4 m/s at optimal evaluation
Output frequency (5 V-TTL level)
100 KHz per channel A or B
Operating speed (5 V-TTL level)
4 m/s
max. Measuring length
theoretically unlimited
Cable
Drag chain suitable, 8 wires (twisted pairs)
5 V / 5 V-TTL = 10 m
max. cable length
10-30 V / 10-30 V = 30 m
10-30 V / 5 V-TTL = 50 m
suitable magnetic tape (accessories) MB20-20-10-1-R
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6. Installation of EMIX3
6.1 Installation with magnetic tape
The red marked “active sensor area“ must be located in the central to the magnetic tape. The easiest way to
ensure the correct position is, to justify the sensor head with the tape, as shown in the following drawing.
active Sensor area*
Tolerances:
All measurements
+/- 0,1 mm
Top view
1 mm
5
12,5
Center
of tape
Magnetic Tape
Justified with tape
5
Cable output
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6.2 Installation with magnetic rings resp. Pole wheels
It is to be made certain that the entire active sensor surface* is within the permitted distance of 0.1 … 0.8
mm to the magnet ring. The active sensor area is represented in the following graph as hatched square.
1 mm
5
12,5
Tolerances:
All measurements
+/- 0,1 mm
Center of
the ring
5
Cable output
15
scanning side
Center of the ring
active Sensor area*
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6.3 Hade tolerances of sensors
+/- 3 mm
1)
Gap
max. 0.8 mm
2)
< +/- 5°
3)
< +/- 5°
Magnetic tape
Magnetic tape
4)
< +/- 1,5°
Magnetic tape
6.4 Installation place
The installation place must be at least 0.5 m away from inductive and capacitive
interference sources as contactors, relays, engines, switch power pack, clocked
controllers, etc. The EMIX2 cable must principally be wired separately from
heavy duty current wires and a distance to interference sources must be kept.
6.5 Supply voltage
The supply voltages must be stabilized DC voltages and should not exceed with
a tolerance of +/- 2.5 % in case of a 5 VDC supply. Allowed ripple: 10-30 VDC
< 5 % respective 5 VDC < 50 mV.
6.6 Fault clearance
If there arise interferences in spite of observing all above mentioned points,
proceed as follows:
1.
2.
3.
4.
Add RC elements over contactor reels of AC contactors (e.g. 0.1 µF/100 Ω)
Add recovery diodes over DC inductances
Add RC elements over each engine phase and over the engine brake
Use separate power pack for following circuits (e.g. indicator, counter etc.)
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7. The Magnetic Tape MB20-20-10-1-R
Construction of the magnetic tape wit 3 components
In the standard case the magnetic tape is delivered as described here.
The tape must be bonded on the mounting surface.
C
Magnetic permeable cover band for protection
(unnecessary for measurement)
Magnetized plastic tape
(Magnetic tape)
A
Scanning side
B
Magnetic conductive steel band
(makes a magnetic short circuit)
Installation surface, e.g. machine bed
Thickness: A + B + C = 1.8 mm
Available lengths: See technical specifications
The Magnetic tape consists of 3 components:
A
The magnetized, highly flexible plastic tape, connected on the lower side with:
B
Magnetic conductable and flexible stainless steel tape. It protects the plastic tape from mechanical damages and is a magnetic short circuit at the same time. This increases significantly the functional security under extreme magnetic influences. Both parts A and B are
already factory-bonded (by ELGO). Alternatively the single components can be ordered
separately (see type designation).
C
To keep the flexibility for transport and installation, the third part a stainless, magnetic
permeable steel tape is delivered separately. It serves for mechanical protection of the
plastic tape, is already equipped with a sticky tape and must be bonded on the magnetic
plastic tape after installation.
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Processing hint for the sticking of magnetic tapes
Materials to stick: The provided sticky tapes stick well on clean, dry and plain surfaces. Typical solvent for cleaning surfaces are a 50/50 mixed isopropyl-alcohol / water mixture or heptane. (Important: Please observe carefully the caution hints of the producer when using the
solvent.) The surfaces of materials as copper, brass etc. should be sealed to avoid an oxidation. Proof: The stability of the adhesion is directly depending on the contact, which the adhesive develops to the surfaces stuck together. A high proof results in a good surface contact.
Sticking temperature: The optimal sticking temperature is between + 21° C and 38° C.
Avoid colder sticking surfaces than + 10°C, because in this case the adhesive becomes to hard
and perhaps a sufficient immediate adhesion is hardly to achieve. After proper sticking the stability of the connection is ensured also when the temperature is below zero. The final tackiness
of a sticking is from experience reached after approximately 72 hours (at + 21° C).
Note for storage: In order to avoid tensions in the tape, it should be
stored in stretched or rolled up condition - with the magnetized plastic tape
resp. scanning side outward (see image).
Resistance against chemical influences
Chemicals, showing no or only small effects:
- formic acid
- glycerol 93°C
- linseed oil
- cotton seed oil
- N-hexane
- lactic acid
- formaldehyde 40% - iso octane
- petroleum
Chemicals, showing small to medium
- acetone
- gasoline
- acetylene
- steam
- ammonia
- acetic acid 20%
- anhydrous
- kerosene
- soy beans oil
effects:
- acetic acid 30%
- Olein acid
- acetic acid, pure acetic acid - sea water
- isopropyl ether
- stearic acid 70°C
Chemicals, showing strong effects:
- benzene
- nitric acid 70%
- nitrobenzene
- lacquer solvent
- turpentine
- nitric acid, red, vitriolic - carbon tetrachloride
- trichloroethane
- tetrahydrofuran - xylene
- hydrochloric acid 37%, 93°C
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7.1 Technical specifications of the tape
Working temperature range
0°... + 70°C
Operating temperature range - 20°... + 85°C
Stock temperature range - 40°... + 95°C
Operation height max. 2000 m above sea level
Humidity max 80 % (not condensing)
Linear extension (relative) ∆L ∆L = L x α x ∆ϑ
(L = Measuring length in meters)
(∆ϑ = relative change of temperature in °K,
based on 20° C room temperature)
Coefficient of extension α 16 x 10 –6 1/K
Bending radius minimum 150 mm
Protection class IP67
Width 10 mm +/- 0.2 mm
Thickness 1.8 mm +/- 0.1 mm (incl. cover band)
max. possible length Standard roll 32 m (up to 70 m on request)
Pole length 2 mm
Influence of external magnets External magnetic fields must not exceed 64 mT (640
Oe; 52kA/m) at the surface of the magnetic tape.
Higher values will damage or destroy the magnetic tape
code. Magnetic fields > 1 mT at the measuring system
has negative influences on the system’s accuracy.
Determination of pole length on already installed tapes:
Incremental tape (2 mm pole length)
A special pole foil (app. 4 cm x 4 cm) is available as
accessories and is useful to make the tape magnetization visible. The pole length can be determined, in order to replace an already installed or unknown tape
correctly.
The pole foil can be ordered by using the following Article Number: 511000220
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8. Type Designation EMIX3
EMIX3-000-03.0-2-00-XXXX
Type description
EMIX3 = big sensor, interpolator integrated
Construction
000 = standard
001 = 1st special version
etc.
Cable length in XX.X m
Resolution
2 = 1/100 mm at IW4
Power Supply/ Output
00 = 10-30 VDC/10-30 VDC
01 = 10-30 VDC/5V-TTL line driver
11 = 5 VDC/5V-TTL line driver
Options
V = IP 67 molded housing (optional version)
R = with 120 Ohm terminal resistors
MB20 - 20 - 10 - 1- R- XX.X
Magnetic tape (accessories)
ELGO Magnetic tape
Pole distance
2.0 mm
Width
10 mm
Number of magnetic tracks
1 = Single track system
Tape construction
R = Standard
Tape length
Please indicate the desired Length in XX.X Meters
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9. Liability exclusion / Guarantee
We have checked the contents of this instruction manual carefully, to the best of our knowledge and belief for conformity with the described hardware and software. Nevertheless errors,
mistakes or deviations can not be excluded, therefore we do not guarantee complete conformity. Necessary corrections will be included in the subsequent editions. We appreciate your
ideas and improvement suggestions very much. Reprint, duplication and translation, even in
extracts, are only allowed with a written authorization by the company ELGO Electric GmbH.
We constantly strive for improving our products, therefore we keep all rights reserved for any
technical modifications without any notice.
ELGO Electric does not assume any liability for possible errors or mistakes.
The guarantee period is one calendar year from the date of delivery and includes the delivered
unit with all components. ELGO Electric GmbH will at its option replace or repair without charge
defects at the unit or the included parts, verifiable caused by faulty manufacturing and/or material in spite of proper handling and compliance to the instruction manual.
Damages verifiably not caused by ELGO Electric GmbH and due to improper handling are excluded from any guarantee e.g. by applying faulty voltage, diffusion of liquid into the interior of
the engine, using force, scratching the surface, chemical influences etc.!
Subject to modifications - © ELGO Electric GmbH 2006
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