Omron Z4M-WR User manual

3
Laser Displacement Sensor Z4M-WR
Visible Beam Class II Laser Displacement
Sensor Provides High Speed Precision
Distance Measurement, Quick Setup, and
Flexible Operation
HFDA, IEC Class II visible beam red laser
H3-micron resolution maximum
H4 to 20 mA analog output
HAutomatic sensitivity setting
HFar and near range indicators on sensor
and amplifier
HStability indicator on amplifier
H3 selectable response times
HUp to 140-mm sensing distance
Ordering Information
JSENSOR
Sensing distance ±measurement range Resolution (at response time) Part number
40 ±10 mm (1.57 ±0.40 in) 3µm(60ms) Z4M-W40RA
(
)
20 µm(2ms)
80 µm (0.15 ms)
100 ±40 mm (3.93 ±1.57 in) 16 µm (500 ms) Z4M-W100RA
(
)
60 µm(20ms)
300 µm(0.7ms)
JACCESSORIES (ORDER SEPARATELY)
Description Part number
Extension Cable 3m (9.84 ft) Z49-C1 3M
8m (26.25 ft) Z49-C1 8M
Z4M-W40RA Z4M-W100RA
20 mm *
Sensing
distance
(mm)
80 mm *
Sensing
distance
(mm)
Linear output (mA)
Conditions When the Linear Output of the Sensor Is
Locked Between 21 and 26 mA
•On startup for the first 3 to 10 seconds after the
sensor is turned ON. (No laser emission on startup
for safety reasons.)
•When the target is outside the measurement range.
•When the enable output is OFF.
JLINEAR OUTPUT VS. SENSING DISTANCE
* Indicates the measurement range.
Linear output (mA)

Z4M-WRZ4M-WR
4
Specifications
JRATINGS
Part number Z4M-W40RA Z4M-W100RA
Measurement range ±10 mm ±40 mm
Measurement point 40 mm 100 mm
Offset adjustment range ±10 mm ±40 mm
Span adjustment range 0.8 mA/mm ±10% 0.2 mA/mm ±10%
Light source Visible-light semiconductor lasers with a wavelength of 670 nm and an output of 1.5 mW
max.; Class 2 (IEC), Class II (FDA)
Spot diameter 1 mm dia. max. (at measurement point) 1 x 2 mm max. (at measurement point)
p
The spot diameter is defined by 1/e2(13.5%) of the sensor’s laser beam center.
There is light leakage outside the defined spot, and the environment of the object may
influence sensing accuracy. Reduce the influence of the environment as much as
possible. (Refer to spot diameter within the ENGINEERING DATA )
Resolution at selected response speed 3µm (60 ms), 20 µm(2ms),
80 µm (0.15 ms) 16 µm (500 ms), 60 µm(20ms), 300 µm(0.7ms)
The resolution is the peak-to-peak displacement conversion value of the analog output
Using a white alumina ceramic target positioned at the rated sensing distance.
Linearity (See Note 2.) 1% FS (See Note 1.) 1.5% FS (See Note 1.)
Response time (See Note 3.)0.15 ms/2 ms/60 ms switch-selectable 0.7 ms/20 ms/500 ms switch-selectable
Sensitivity selector WHITE/BLACK/AUTO switch-selectable
Temperature characteristics
(at measurement point) Sensor: 0.03% FS/°Cmax. Amplifier: 0.03% FS/°Cmax. Sensor: 0.02% FS/°Cmax. Amplifier: 0.03% FS/°Cmax.
Range indicators Outside range, abnormal volume of light: NEAR indicator and FAR indicator flash.
Near: NEAR indicator is lit.
Measurement point: NEAR indicator and FAR indicator are lit.
Far: FAR indicator is lit.
Note: The range indicators, located on sensor and amplifier, are also used as laser
warning lights (green).
Stability indicator (amplifier) Stable operating range: green
Possible operating range: not lit
Insufficient or excessive light: red
Linear output 4to20mA/30to50mm
Output impedance: 300 Ωmax. 4to20mA/60to140mm Output impedance: 300 Ωmax.
It is possible to adjust the linear output of the sensor to between 3.2 to 20.8 mA with
the span adjustment.
Enable output NPN open collector, 50 mA max. at 40 VDC, residual voltage: 1 V max.
Laser emission OFF input Short-circuited with the 0-V terminal (residual voltage: 2 V max.): Laser emission is
turned OFF.
Open (current leakage: 0.1 mA max.): Laser emission is turned ON.
Linear output, indicators, and enable output holding function incorporated.
Note: 1. The FS (Full Scale) value (listed in the preceding table) is calculated as follows:
Example: 1% FS on the Z4M-W40RA
Distance full scale conversion: 20 mm x 0.01 = 0.2 mm
Voltage full scale conversion: 16 mA x 0.01 = 0.16 mA
Part Number Z4M-W40RA Z4M-W100RA
Distance full scale 20 mm 80 mm
Current full scale (The value changes according to the span to be adjusted.) 16 mA ±30% 16 mA ±30%
2. The linearity of the sensor is checked with a white
alumina ceramic object. The peak-to-peak value
deviated from the displacement linear output
voltage is within the specified range, as shown in
the graph. The deviation value may vary with the
object. (Refer to the preceding table.)
1% max.
30 50
Output curent (mA)
4
Distance (mm)
3. The response speed of the sensor is the time
required for the analog displacement output to
increase from 10% to 90% of the full value (at the rise
time) or decrease from 90% to 10% of the full value
(at the fall time). To decrease the error ratio to within
1% at the rise time, the time required will be two or
three times as long as the specified value. (Refer to
the preceding table.)
Displacement
Displacement
output
90%
10% 90% 10%
Response time Response time

Z4M-WR Z4M-WR
5
JCHARACTERISTICS
Part number Z4M-W40RA Z4M-W100RA
Power supply voltage 12 to 24 VDC ±10%, ripple (p-p): 10% max.
Current consumption 150 mA max.
Dielectric strength Sensor: 1,000 VAC, 50/60 Hz for 1 min.
Amplifier: 300 VAC, 50/60 Hz for 1 min.
Vibration resistance Destruction: 10 to 55 Hz (1.5-mm double amplitude) for 32 minutes each in X, Y, and Z
directions
Shock resistance Destruction: 300 m/s2, 30G for 3 times each in ±X, Y, and Z directions
Ambient temperature Operating: 0°to 50°C(32°to 122°F) with no icing
Ambient humidity Operating: 35% to 85% (with no condensation)
Ambient illumination Operating: 3,000 lux max. (incandescent lamp)
Weight Sensor: Approx. 180 g (6.35 oz.) with 2-m cable
Amplifier: Approx. 200 g (7.05 oz.) without cable
Material Sensor: Aluminum diecast
Amplifier: ABS
Enclosure rating IP40
Accessories supplied Flat-blade screwdriver for sensor adjustment, FDA Caution Label
Nomenclature
JSENSOR
Z4M-S40R (for Z4M-W40RA)
Z4M-S100R (for Z4M-W100RA)
Range indicators:
FAR
indicator
NEAR
indicator
Warning for laser
(An English warning sticker
is provided with the model.
Attach the sticker as shown.)
Emitter
(laser
beam
emitter)
Receiver
Connector
Stability
indicator
Offset
adjustment
Span
adjustment
Sensitivity
selector
Response
speed
selector
Connector
terminals
NEAR
indicator
FAR
indicator
4to20mA
JAMPLIFIER
Z4M-W40AC (for Z4M-W40RA)
Z4M-W100AC (for Z4M-W100RA)
Serial
number
location
COMPATIBILITY NOTICE
The Z4M-WR Laser Displacement Sensor and Amplifier are adjusted
as a set, and they have the same Serial No. Neither (sensor or
amplifier) can be used with another amplifier or sensor having a
different Serial No.
Serial number
location (on the
bottom edge)

Z4M-WRZ4M-WR
6
Operation
JFUNCTIONS
Classification Function
O
U
T
P
Linear Output
(amplifier) An analog current signal according to the measuring distance will be output from the output
line (black shield wire).
Current output: 4 to 20 mA/30 to 50 mm (Z4M-W40RA), 4 to 20 mA/60 to 140 mm
(Z4M-W100RA)
Linear output will be locked between 21 to 26 mA when the enable output is OFF.
P
U
TEnable Output
(amplifier) Enable output is ON when the sensor is performing a displacement measuring operation.
The enable output is OFF when there is no object in front of the sensor or if the light reflected
from the object is either insufficient or too intense.
An open collector output of 50 mA at 40 VDC maximum can be obtained.
When measuring a metal or glossy object, the enable output may be ON even if the object is
outside the measurement range.
I
N
P
U
T
Laser OFF Input
(amplifier) The laser OFF input controls laser emission. Laser emission is turned ON when there is
no laser OFF input (with a current leakage of 0.1 mA max.); it is turned OFF when the
laser OFF input is short-circuited to the 0-V terminal (with a residual voltage of 2 V max.).
When laser emission is turned OFF, the linear output, indicators, and the enable output of
the sensor are on hold.
There will be a drift of 0.1% FS/s when the analog output of the sensor is on hold.
The response time required to turn laser emission ON or OFF is 3 ms max. Linear outputs
have transient characteristics that vary with the response speeds.
I
N
D
I
C
A
T
O
R
S
Range Indicators
(NEAR and FAR)
—alsousedas
laser warning lights
(sensor and amplifier)
The FAR green indicator and NEAR green indicator will be lit when the object is within the
measurement range of the sensor.
When the object is outside the measurement range or when there is insufficient or excessive
light, both the NEAR indicator and FAR indicator will flash. If the object is near the sensor
and outside the measurement range, only the NEAR indicator may flash.
Flashing
Flashing
Approximately 28 mm
Lit
Measurement point
40mm Approximately 52 mm
NEAR indicator
FAR indicator
NEAR indicator
FAR indicator
Approximately 55 mm
Lit
Lit
Lit Flashing
Approximately 155 mm
Z4M--W40RA
Z4M--W100RA
Flashing
Mount the sensor so that both the NEAR indicator and FAR indicator will be lit when the
object is placed in front of the sensor.
The NEAR indicator and FAR indicator are also used as laser warning lights. When the
sensor is turned ON, the NEAR indicator or FAR indicator or both the indicators will be lit
or flash. When the
laser OFF input is ON, the previous condition will be on hold (i.e., the indicator(s) will be
lit or flash), alerting the user that the laser beam will be turned ON when the laser OFF input
is turned OFF.
Stability Indicator
(amplifier) The indicator will be lit in green when the target is within the measurement range and the
receiver receives enough intense light reflected from the object. When the indicator is green,
the sensor’s measuring operation is stable.
If the indicator is not lit in green while the sensitivity selector is set to WHITE, set it to
BLACK or AUTO for a more stable measuring operation. Normal output can be obtained
even if the indicator is not lit in green.
The indicator will be lit in red when there is no object in front of the sensor or if the light
reflected from the object is insufficient or too intense. Check if the sensitivity selector is set
correctly (according to the reflection ratio of the object if the indicator is red).
Laser Emission
Delaying Function
(sensor and amplifier)
When the sensor is turned ON, the range indicators (green) will flash for 3 to 10 seconds,
alerting the user to laser emission, and the linear output is locked between 21 to 26 mA.
After this 3 to 10 seconds, the laser beam will be turned ON.
(This table continues on the next page.)

Z4M-WR Z4M-WR
7
Classification Function
Sensitivity Selector
(amplifier) Set the sensitivity selector according to the reflection ratio of the object.
If the color of the object is white, set it to WHITE. If the color of the object is black, set it to BLACK.
If the object is alternating white and black, set it to AUTO.
When the sensitivity selector is set to AUTO, the enable output may be ON even if the target
is outside the measurement range, in which case set the sensitivity selector to WHITE so that the
number of errors that may occur can be minimized.
Response Speed
Selector
(amplifier)
Select the response speed (by considering the required response speed and resolution).
Response speed Fast: Resolution Low
Response speed Slow: Resolution High
A
D
J
U
S
T
M
E
N
T
S
Offset Adjustment
(amplifier)
Z4M-W40RA Z4M-W100RA
Sensing
distance
(mm)
Sensing
distance
(mm)
Offset adjustment is made using a white
ceramic object before shipping, so the user
may not need to adjust the output.
To set the sensor output to 12 mA at the
standard distance, connect a Signal
Process Meter (such as K3TX or K3TS) to
the output terminal of the sensor. Place a
standard object in front of the sensor and
adjust the output with the offset adjuster.
Flat-blade
screwdriver
Offset adjustment
Span adjustment
Connect to a
Signal Process
Meter, such as a
K3NX or K3TS.
Offset adjustment shifts the actual current
(solid line) in either the positive or negative
direction.
Offset adjustment is commonly used in
applications where the displayed
measurement is relative to 12 mA. The
12 mA current output would be preset using
a gauged work piece of the specified
tolerance range.
Span Adjuster
(amplifier)
.
Z4M-W40RA
Span Adjustment
Span adjustment is made using a white ceramic object before shipping, so the user may not
need to adjust the span.
To calibrate the displacement output, adjust the span as follows:
1. Locate the target at the standard distance and adjust the offset adjustment.
2. Move the object for a specified distance and set the span adjustment so that the voltage
will change appropriately, according to the displacement.
Z4M-W100RA
The Span adjustment changes
the ratio of the output current
(displacement) to the distance.
By using the Span adjustment
the actual current-distance
relationship can be altered to
either a higher output current
atthesamedistanceortoa
lower output current.
Span adjustment is used to modify
the current output level if a
1:1 ratio is not obtained due
to changes in material or color
Sensing
distance
(mm)
Sensing
distance
(mm)
Axis and Distance
Adjustment Both the FAR
and NEAR
indicators are
lit when the
target is at the
measurement
point.
•The Z4M-WR uses a visible laser beam emitter. The spot of
the beam under normal lighting conditions can be confirmed
without the use of phosphor cards.
•The sensor incorporates a laser beam delaying circuit, so
the laser will start emitting 3 to 10 seconds after the sensor
is turned ON.
•Ensure that the center of the object displacement will be in
the center of the sensor’s measurement range.