turck EZ-track User manual

EZ-track®
Q21 Series Quadrature Output
Manual
Your Global Automation Partner

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Contents
Chapter 1: Hardware Overview......................................................................................... 3
1.1 Dimension Drawing for Q21 Quadrature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Chapter 2: Installing the LDT
2.1 Installing the LDT .................................................................................................... 5
Chapter 3: EZ-track Q21-DQ Overview
3.1 Quadrature Output ................................................................................................... 6
3.2 Signal Connection Application Note .................................................................................. 6
3.3 Quadrature Output Resolution & Speed............................................................................... 7
3.4 Q21-DQ Wiring Connection .......................................................................................... 7
3.5 Features ............................................................................................................. 11
3.6 Q21-DQ.............................................................................................................. 12
3.7 Trouble shooting for Q21-DQ ......................................................................................... 13
3.8 Catalog Numbering System for Q21 .................................................................................. 14
3.9 Accessories .......................................................................................................... 15
3.10 Specications for Q21-DQ........................................................................................... 16
Warning:
Disconnect Power Before Servicing. The Q21 Quadrature Contains No Serviceable Components.
Consult Factory for Repair or Replacement.

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Chapter 1: Hardware Overview
Overview
The Q21 with Quadrature Output is an accurate, auto-tuning, non-contact, linear displacement transducer in an economical,
low prole package. The transducer utilizes our eld proven magnetostrictive technology to give absolute position,
repeatable to .006% of the sensing distance. The streamlined anodized aluminum extrusion houses the sensing element and
electronics. The magnet moves over the sensing element that determines the position and converts it to incremental outputs.
Features
The Q21-DQ LDT has a truly unique feature. This LDT has auto-tuning capability, the ability to sense a magnet other than the
standard slide magnet and adjust its signal strenth accordingly.
There is an indicator LED that is located at the connector end of the probe and provides visual status information regarding
the operation of the probe. Green indicates proper or normal operation. Red indicates the loss of the magnetic signal or a
probe failure.
Green: Magnet is present and within the active range.
Red: Fault, the LDT has lost its signal from te magnet or the magnet has moved into the Null or Dead zone.
Yellow: Used when in communication/program mode.
The Q21 with Quadrature Output provides A and B digital output signal that is proportional to the position of the magnet
assembly along the length of the LDT. The quadrature output makes it possible to have a direct interface to virtually any
incremental encoder input or counter card, eliminating costly absolute encoder converters and special PLC interface modules.
A “Z”channel is also provided and its position can be set by the user at any position along the active stroke. The transducer
features an input to re-zero the LDT“on the y”. Another unique feature is the “burst” mode. An input on the transducer
triggers a data transfer of all the incremental position data relative to the transducer’s absolute zero position. This is how the
incremental output can provide absolute functionality. The “burst” input can be used to achieve absolute position updates
when power is restored to the system or anytime an update is needed to re-zero or home the machine without having to
move the machine.
Note:
The part number on your LDT is a record of all the specic characteristics that make up your unit. This includes what
interface type it is, its output signal and range, the type of connector the unit uses, and stroke length.

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1.1: Dimension Drawing for the Q21 Quadrature
5
1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax [phone] • www.AMETEKAPT.com
.25
OF MAGNET SLUG
A standard female swivel mounting arm is
provided with the slide magnet assembly.
For extensions and other options contact
TURCK at 800-544-7769.
Mounting Brackets (MB-Q21) slide in the grooves on the
side of the extruded housing. When tightened down with
fastening hardware the mounting bracket clamps the unit into
place. It is recommended to use one mounting bracket on each
end and every three feet between.
.22 MTG. HOLES
2 PER MTG. FOOT
.60
.30
R.87
360 ROTATION
1.00
.30
.36
1.97
1.372.68
1.50
.08
.28
.87 .56
.25 TO CENTERLINE MAGNET SENSOR
1.50
DEADZONE
STROKE
L = NULL + STROKE + DEAD ZONE
3.00 NULL
1.80
1.45 .82
.10
.22
10 PIN MALE
CONNECTOR
.98
.36
.40
.55
1.19
2.06
M5 X .40 DEEP
LINKAGE MTG. HOLE
M5 X .56 DEEP
ALTERNATE MTG.
HOLE FOR LINKAGE
P/N SM-Q21
SLIDE MAGNET ASSEMBLY
.08
OF MAGNET SENSOR
.25 TO CENTERLINE
OF MAGNET
TO CENTERLINE
P/N FM-Q21
FLOATING MAGNET ASSEMBLY
2 PLACES
360 ROTATION
R.87
2 PLACES
OTHER END
.359 C’BORE
.21 DEEP
1.50
.69
1.30
1.04
.68
.28
.87
1.37
.56
1.31
1.31
2.00
.75
.34
.50
1.00
.34
.20 THRU
.50
.25
.20 THRU
Figure 1.1 Dimension Drawing
Note: The North Pole of the magnet
should be pointed towards the probe.
Accessories
Item Part Number
Slide Magnet SD0521800
Float Magnet SD0522100
Mounting Foot SD0522000
6 Ft. Cable (Option H) SD0527700L6
12 Ft. Cable (Option H) SD0527700L12
25 Ft. Cable (Option H) SD0527700L25
6 Ft. 12 Pin
(Option E Connector)
949023L6
12 Ft. 12 Pin
(Option E Connector)
949023L12
Control Arm 955ARMXX (X = Inches)
2.00
Male Connector
C
L

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Chapter 2: Installing the LDT
Mounting Instructions
The Q21-DQ LDT can be mounted vertically or horizontally using MB-Q21 mounting brackets. The mounting brackets slide
in the grooves on the lower part of the extrusion and clamp down when tightened. It is recommended to use one mounting
bracket on each end and every three feet in between. Ferro-magnetic material, (material readily magnetized) should be
placed no closer than .25” from the sensing surface of the LDT.
Mounting the Magnet Assembly
Before mounting the magnet assembly, you should consider the following:
• Ferromagnetic material should not be placed closer that 0.25 inches from the LDT’s sensing surface. Failure to do so
could cause erratic operation. Non-ferrous materials, such as brass, copper, aluminum, non-magnetic stainless steel or
plastics, can be in direct contact with the magnet assembly and sensing surface without producing any
adverse results.
• Make sure that the magnet is located within the LDT’s active stroke area. Captive magnet assemblies should be
positioned so that they can move freely over the entire area of the active stroke without binding or pushing on the
extrusion. Non-captive magnet assemblies should be situated so that the magnet is no further than 3/8” from the sensing
surface at any point in the oating magnet assembly’s movement.
• When using the Floating Magnet assembly (FM-Q21), the magnet should be installed within .375 inches of the sensing
surface. The magnet assembly should also be installed in such a manner that it remains an even distance from the
aluminum extrusion throughout the entire stroke. Improperly installed magnets can result in output signal non-linearity.

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Chapter 3: EZ-track Q21-DQ Overview
3.1: Quadrature Output
The output from the transducer can be wired directly to any incremental encoder input card, without the need for a special
converter module or PLC interface card designed specically for use with a pulsed output magneto-restrictive transducer.
The quadrature output provides absolute position data in engineering units. This means that the need for the calibration
constant (wire speed) programming has been removed, thereby eliminating the possibility of having an improperly
calibrated system. The output signal wires are driven by dierential line drivers, similar to the drivers used in most pulsed type
transducers, providing a high degree of noise immunity.
A unique feature of this transducer is a “burst” mode of operation. An input on the transducer triggers a data transfer of all the
incremental position data relative to the transducer’s absolute zero position. This can be used to achieve absolute position
updates when power is restored to the system or anytime an update is needed to re-zero or home the machine. Additionally,
another input to the transducer can be used to establish a“zero” position for the transducer.
3.2: Signal Connection Application Note
Overview
This application note will clarify the input and output signals of the Q21-DQ LDT probe.
Inputs
The quadrature probe has two inputs, the “zero” and “burst” inputs. These inputs are “single ended”. That is, the connection for
each input consists of only one wire, the corresponding signal wire. For these single ended inputs, the signal is measured with
reference to the power supply ground, which is sometimes referred to as “common”.
The quadrature probe is available with either +24 VDC level signal thresholds or TTL level thresholds. The signal voltage level
required to activate the input for the +24 VDC level signal is approximately 41% of the power supply voltage.
* For example, if the power supply voltage powering the probe is exactly 24VDC, the threshold voltage would be
approximately 9.84 volts.
The TTL level threshold signals are activated when these inputs exceed the typical TTL level threshold, which is 2.0 VDC.
Additionally, for the 24 VDC level signals, either a“sourcing”or“sinking”type of input can be specied. A “sourcing”input type
is pulled high internal to the probe. To activate a “sourcing”input, the customer must pull the signal lower than the threshold
voltage to activate the input. A“sourcing” input is usually driven by a “sinking” output or a switch connected to ground.
A “sinking” input type is pulled low internal to the probe. To activate a “sinking” input, the customer must pull the signal
higher than the threshold voltage to activate the input. A “sinking” input is usually driven by a“sourcing”output or a switch
connected to the power supply.
It is important that the customer drive the signal levels much greater or lower than the threshold voltages. Asserting a signal
with a voltage level close to the threshold voltage could induce multiple activations of that input (or none at all) and therefore
produce unexpected results or probe readings.

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3.2: Signal Connection Application Note (continued)
Outputs
The quadrature probe has three dierential outputs, the “A”, “B” and“Z” outputs. These outputs are“dierential” (also known as
“balanced”). That is, the connection for each output consists of two signal wires. These are typically described as the “+” and“-”
signals. For example, the “A” channel consists of “A+” and “A-”. The same applies to the B and Z channels. For these (dierential)
outputs, the signal is measured with reference to the other signal (i.e. the dierence or dierential). For example, if the “A+”
signal voltage is greater than the “A-”signal, channel “A” is a logic “1”. Conversely, if the “A+” signal voltage is lower than the “A-”
signal, channel“A” is a logic “0”. Again, this applies to the B and Z channels as well. Dierential type signals are much less prone
to interference caused by electrical noise or ground loops more often found in single ended signal connections.
The dierential outputs of the A, B and Z channels are at RS-422 signal levels on option“R”output driver units. RS-422 is a
well known TIA/EIA standard and common interface type for incremental encoders. The RS-422 receiver channel (on the
PLC or controller side of the connection) typically has what is referred to as a termination resistor connected across the “+”
and “-”signal pins. The value of the termination resistor is (by RS-422 specications) typically 100 ohms. For proper signal
integrity, especially at higher data rates (i.e. quadrature pulse frequency), a termination resistor of no greater than 1 k is
recommended.
Driving Single Ended Inputs
A dierential output can also be used to drive single ended inputs. Special consideration must be given to these types of
applications. It should be noted the main signal requirements for an RS-422 signal is the dierential voltage of the “+”relative
to the “-”signals and not necessarily the voltage level of any one of these signals with respect to ground (or common). To meet
the RS-422 specication, this dierential voltage only needs to be +/- 0.2 volts. However, an RS-422 driver will typically drive
either the “+”or“-” signal to around 3.8 volts with respect to ground. This voltage is more than sucient to drive TTL level
inputs as well as other low level inputs. The input voltage level specications of the PLC or controller being used should be
consulted for the actual level required.
When using PLC’s or controllers that are not TTL compatible output driver option “L” should be used. Option“L”uses a L7272
line driver I.C. The output from this driver will be 1 volt less than the LDT’s input power.
When physically connecting a dierential output to a single ended input, only use the“+”signal, leaving the “-”signal
unconnected. Do NOT connect the “-” signals to ground. The “A+, “B+” and“Z+” signals should be connected to their
corresponding inputs. Insulate and tie back the“-” signals.
3.3: Quadrature Output Resolution & Speed
The internal resolution of the Q21-DQ LDT is 0.001”. This would be represented to the encoder input device by specifying an
output resolution of 1,000 cycles per inch for the transducer. Although the typical resolution is 1,000 cycles per inch (CPI), the
transducer can be ordered with virtually any CPI setting.
For a typical rotary type shaft encoder with incremental quadrature output, the output frequency of the pulses is governed
by the resolution of the encoder (pulses per turn) and the rotational speed (RPM) of the encoder. The output pulse rate from
the transducer is stretched out over the LDT internal update time. The output frequency must be specied so that it does not
exceed the maximum pulse rate of the encoder input card the sensor is connected to. The output pulse frequency range can
be ordered from 1KHz to 1MHz.
3.4: Q21-DQ Wiring Connections
Once the LDT has been installed, wiring connections can be made. There are two groups of connections you will need to make.
They are as follows:
• Power Supply Connections (including grounding and shielding)
• LDT Input/Output Connections
Power Supply/Ground Connections
To reduce electrical noise the shield must be properly used. Connect the cable’s shield to the controller system GND. The cable
shield is not connected at the transducer end. Always observe proper grounding techniques such as single point grounding
and isolating high voltage (i.e. 120/240 VAC) from low voltage (10 - 30 VDC cables). Whenever possible, this cable should be
run in conduit by itself.

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3.4 Q21-DQ Wiring Connection (continued)
Unipolar
Figure 3-1: Power Supply Wiring
Warning:
Do not route the Q21 with Quadrature Output cable near high voltage
Pin 1 White B+
Pin 2 Brown +V
Pin 3 Green Z+
Pin 4 Yellow Z-
Pin 5 Grey A+
Pin 6 Pink A-
Pin 7 Blue GND
Pin 8 Red Burst
Pin 9 Orange Zero
Pin 10 Tan B-
Pin 11 N/C -
Pin 12 N/C - Female View
Figure 3-2: Power Supply Wiring

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3.4 Q21-DQ Wiring Connection (continued)
Figure 3-3: Input Signal Connections for Q21 Quadrature LDT
Cable Assembly
Cable Assembly
Input Connection for Q21-DQ LDT with Sinking Input
Input Connection for Q21-DQ LDT with Sourcing Input

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3.4 Q21-DQ Wiring Connection (continued)
Figure 3-4: Output Signal Connections for Q21 Quadrature LDT
Cable Assembly
Cable Assembly
Output Connection for Q21-DQ LDT with Dierential Interface
Output Connection for Q21-DQ LDT with Single Ended Interface
**Note: Tie back and insulate
unused A-, B- and Z- wires

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3.5 Features
Automatic Gain Control
The Automatic Gain Control feature will automatically search and nd the magnet on power up, if power is applied without
a magnet on the LDT, the LED will turn RED indicating no magnet signal is detected. Turn power o and place magnet within
the active stroke area. Re-apply power.
When using the Floating Magnet assembly, the magnet should be installed within 3/8” of the sensing surface. The magnet
assembly should also be installed so that it remains an even distance from the aluminum extrusion throughout the entire
stroke. Improperly installed magnets can result in output signal non-linearity.
Burst Mode
This feature enables the system to be absolute even though data transfer is through an incremental method. In the event of
power failure, the controller can be programmed to automatically send a signal to the probe, which will then respond with
the current position data. An input signal to the probe will cause a “Burst” of data, representing the absolute position, to be
fed back to the controller.
LED Colors
Green Magnet is present and within the active programmed range.
Red Fault, the LDT has lost its signal from the magnet or the magnet has moved inot the Null
or Dead zone.
Yellow Factory use only. Used to determine when the LDT is in the programming mode.

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3.5 Features (continued)
ZERO Pulse
By sending an input signal to the probe at any point in the stroke, a new zero point can be established. When using the burst
input, the absolute position provided will be relative to the programmed zero position. In probes with volatile storage the
zero point will be kept until a new zero pulse is sent or until the probe loses power. Probes with nonvolatile storage will store
the zero position even if you lose power. The nonvolatile zero can be set 100,000 times; the volatile zero can be set an innite
number of times.
3.6 Q21-DQ
Frequency or Pulse Rate
Selecting the proper frequency in the LDT’s part number is very important. The Q21-DQ has an internal update time of 1 milli-
second on LDT’s less than 60” in length and approximately 2 milliseconds on the units greater than 60” in length. The LDT will
stretch the amount of pulses travelled over the update rate. All incremental pulses must be transmitted before the LDT will
interrogate itself again. The frequency or pulse rate of the Q21-DQ is factory set from 1KHz - 1.00MHz, consult part number for
your model. The input for the PLC or display will determine the frequency needed.
Example: If your PLC High Speed counter card or display accepts a 1MHz encoder input, the choices are
NOTE:
If your controller’s maximum input frequency falls between two available frequencies, choose the lower frequency.
Output Drivers
The Q21-DQ LDT uses a 0L7272 line driver IC. Your LDT was congured at the factory for either a TTL level output or a 10 - 30
VDC level output. Refer to label on LDT for your output type.
R = Dierential RS-422 line driver, TTL compatible
L = Dierential line driver 10 - 30VDC
V out = V in (LDT Power) -1 volt
Option R has a 5 volt TTL level output regardless of input power.
Option L has an output of 1 volt less than probe input power. This option is used when driving higher voltage input cards and
is not TTL compatible.
A = 10KHz
B = 25KHz
C = 50KHz
D = 75KHz
E = 100KHz
F = 150KHz
G = 250KHz
H = 500KHz
I = 1.00MHz

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3.7 Troubleshooting for Q21-DQ
Troubleshooting describes common problems that may occur when installing the LDT and oers possible solutions to these
problems. If, after reading this appendix, you are unable to resolve a problem, contact our technical support department at
1-800-544-7769.
General Checks
Make sure that the magnet is located within the LDT’s active stroke area. Captive magnet assemblies should be positioned so
that they can move freely over the entire area of the active stroke without binding or pushing on the extrusion. Non-captive
magnet assemblies should be situated so that the magnet is no further than 3/8” from the sensing surface at any point in the
oating magnet assembly’s movement.
NOTE:
Ferromagnetic material (material readily magnetized) should be located no closer than 0.25” from the sensing surface of the
LDT. This includes mounting brackets, magnet spacers, magnet brackets, and mounting screws. Ferromagnetic material can
distort the magnetic eld, causing adverse operation or failure of the LDT.
Check all LDT wires for continuity and/or shorts. It is preferable that the cable between the LDT and the interface device be
one continuous run. If you are using a junction box, it is highly recommended that the splice junction box be free of AC and/
or DC transient-producing lines. The shield should be carried through the splice and terminated at the interface device end.
Power Supply Check
This section will help you to determine if your power supply is adequate for the LDT to operate properly, or if the LDT’s cable
has a short or open. In order for the Q21-DQ LDT to operate properly, the external power supply must provide a level between
13.5 to 30 VDC. A power supply providing voltage above this specied range may damage the LDT. A power supply providing
power below this specied range will not be sucient to power the LDT. When powering more than one LDT on a single
power supply, remember that each LDT requires three (2.5) watts of power maximum (2 watts typical). The amount of current
draw will vary based on the input voltage used. To calculate the current draw for a particular LDT, divide the LDT wattage by
the input voltage. For example, 2 watts divided by 24 VDC equals 104 mA.
If your LDT is not operating properly, the LDT’s cable may have an open or short, or the power supply is not supplying
sucient power. To verify this, perform the following steps:
1. Turn the power supply o.
2. Remove the mating connector from the LDT.
3. Turn the power supply on.
4. Using a digital voltmeter, check from power supply common (GND) and Power Supply + (Vsource) from the mating end of
the cable for a level between +13.5 and +30 VDC.
If reading is between 13.5 and 30 VDC, turn power supply o and go to step 7. If reading is below 13.5 VDC, either your
power supply is not providing enough power or the LDT’s cable possibly has a short/open. Readings of no voltage or minimal
voltage (less than 5 volts) may be due to short/open in the cable. If reading is not between 13.5 and 30 VDC, go to step 5. If
reading is above 30 VDC, adjust power supply or replace.
5. Turn the power supply o.
6. Check the continuity of the individual wires of the cable between the power supply and the LDT. Check for continuity from
one end of the cable to the other. Also verify that no shorts exist between pins.
7. Reconnect the mating connector to the LDT.
8. Turn power supply on.
9. Using a digital voltmeter, check the power supply’s “+” and“-”terminals for a voltage between 13.5 and 30 VDC.
Low voltage readings may indicate a power supply with a wattage (current) rating that is too low. (Each LDT requires 2.5
watts). If the cabling checks out in step 6 and your voltage is below 13.5 VDC, check your power supply current rating. If
voltage is between 13.5 to 30 VDC and the LDT is still inoperative, contact factory.

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3.8 Catalog Numbering System for Quadrature Q21
Part Number Key: Quadrature Prole Series
A Type
LT Linear Transducer
B Measuring Span
* Length of Measuring Span
C Units of Measurement
E Inches
D Housing Height
Q21 21 mm
Q35 35 mm
A B C D E F G H I J K
LT 40 E - Q21 - DQ R A N N X2 - H11121
F Output Conguration
L 10-30 VDC, Line Driver
R 13.5 - 30 VDC, RS422 Line Driver (TTL Compatible)
E Resolution
DQ Quadrature
H Zero Oset Storage
N Nonvolatile (100,000 storage cycles max)
V Volatile
G Quadrature Cycle Frequency
A 10 kHz F 150 kHz
B 25 kHz G 250 kHz
C 50 kHz H 500 kHz
D 75 kHz I 1000 kHz
E 100 kHz
IInput Type
N Sinking (Typically used with Sourcing Outputs)
P Sourcing (Typically used with Sinking Outputs)
T TTL Level
J Number of LED's
X2 2 Diagnostic LED's
K Type of Connection
H11121 12-pin M12 eurofast® Connector

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3.9 Accessories
Slide Magnet
SM-Q21 [A5600]
Slide Magnet with Slide Adapter
SA-Q21 [A0864]
Floating Magnet
FM-Q21 [A5500]
* Lengh in inches.
Control Arms
CA*E-Q21
Q21 Upside Down Brackets
UB-Q21 (2/bag) [A5500]
Q21 Mounting Brackets
MB-Q21 [A5700]
Rod Ends
RE-Q21 [A0865]
RBVA-M5
Angle Joint for M5 Thread,
Stainless Steel
ABVA-M5
Angle Joint for M5 Thread,
Stainless Steel

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3.10 Specications for Q21-DQ
General Specications
Null Zone 3.00”
Dead Zone 2.00”
Extrusion Assembly Anodized Aluminum with gasket seals, IP 67, IP 68 Optional
Connector 12 Pin, 12mm eurofast® Connector
Sensor Length 5” to 180”
Agency Approval CE
Shock & Vibration Random Vibration
Shock
MIL-STD 810E, 10Grms random, 20Hz - 2K Hz
Tested to 40G
Electrical Specications
Input Voltage Unipolar 13.5 to 30 VDC
Current Draw 2.5 watts maximum
Nonlinearity +/- 0.05% of full stroke
Repeatability +/- 0.006% of full stroke
Hysteresis +/- 0.02% of full stroke
Operating Temperature -20° to 70° C
Storage Temperature -40° to 85° C
Drivers
Option R 1. Quadrature A RS-422 dierential
2. Quadrature B RS-422 dierential
3. Zero (index) position RS-422 dierential
Maximum 5 volts, minimum 2 volts into a 50 ohm load (TTL compatible)
Option L 1. Quadrature A dierential line driver
2. Quadrature B dierential line driver
3. Zero (index) position dierential line driver
Maximum 30 VDC, min 13.5 VDC, driver 0L7272
V out = V in (LDT Power) - 1 volt
Digital Input 1. Zero position set 5 - 30 volts Source or Sink
2. Burst mode input 5 - 30 volts Source or Sink
Input impedance 5 K ohms
Sink threshold Input < 0.41 * Power Supply Voltage
i.e. 0.41 x 24 VDC Power Supply = < 9.84 VDC
Source threshold Input > 0.41 * Power Supply Voltage
i.e. 0.41 x 24 VDC Power Supply = > 9.84 VDC
TTL threshold Input > 2.1 Volts
Update Time 40”or less 1mS (Stroke Lengths 5” to 40”)
41” to 100” 2mS (Stroke Lengths 41” to 100”)
101” to 150” 3mS (Stroke Lengths 101” to 150”)
151” to 180” 4mS (Stroke Lengths 151” to 180”)
Specications are subject to change and are based on a typical 36”LDT

www.turck.com • Phone: [phone] • Application Support: 1-800-544-7769 • Fax: [phone] • Turck Minneapolis, MN 55441
Notes:

Notes:

Notes:

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