The SENC 150 precision glass scale linear encoder provides the
accuracy and reliability of an ACU-RITE
®
measuring system with
digital output. Features and options include:
Resolutions of 0.5, 1, or 5 µm.
Accuracy grades of ± 3, and ± 5 µm/1000 mm.
Vinyl or armor cables of 5, 13, and 19 ft. length.
Distance-coded reference marks.
Note: Mounting and commissioning is to be conducted
by a qualified specialist under compliance with local safety
regulations. Do not engage or disengage any connections
while under power. The system must be disconnected from
power.
Contents key
A SENC 150 linear encoder
B Backup spar
C Reference manual
D Cable mounting hardware
E Linear encoder mounting hardware
F Backup spar mounting hardware
G Quality test certificate
Contents
ML ≤ 1550 mm (60”)
A
Contents
ML ≥ 1675 mm ( 65”)
A
SENC 150
C
E
SENC 150
C
E
D
REFERENCE MANUAL
G
D
REFERENCE MANUAL
F
G
B
4
Page 5
SENC 150
2 Preparing the mounting
Mounting surface clean and free of paint. Protect sealing lips from splash water.
*LL [mm] x 25.4 + 161.6
*LL [“] + 6.362
***L [“] ±0.35
***L [“] ±0.014
**19 mm
**0.748”
* 28.8 mm
* 1.134”
*** 36.6 mm
*** 1.441”
* Linear encoder
** Linear encoder with center support
*** Linear encoder with backup spar
57 mm
2.244”
F = Machine guideway
L = Length of backup spar (page 10)
H2 for ML ≥1675 mm (65”)
backup spar included
in items supplied
for ML ≤1675 mm (65”)
backup spar optional
B = Number of holes
No.
holes B
10
Page 11
SENC 150
5 Mounting the encoder without backup spar
A variety of mounting conditions can be accomodated.
The machine configuration determines the brackets required
to mount the linear encoder.
Two typical mounting conditions are shown: flush and offset.
All fasteners shown on this page are supplied with the encoder
hardware.
Flush surfaces
1
2
3
M6 x 25 mm BHCS
13
(1/4”-20 x 1” BHCS)
M6 flat washer
Mounting surfaces are flush within 0.25 mm (0.010”).
The reading head leveling screws are not required.
M4 x 25 mm SHCS low head
2
(8-32 x 5/8” SHCS low head)
(8-32 x 3/4” SHCS low head)
2
Offset surfaces
1
2
Space of ≤4.5 mm (≤0.18”) use
reading head leveling screws!
2
M4 hex nut
Mounting surfaces are offset.
Mounting without backup spar.
Use leveling screws in place of spacers or shims.
2
2
3
11
Page 12
5.1 Mounting the encoder via end holes
Bore hole pattern
SENC 150
Mounting
LL < 625 mm (24“):
Use end mounting holes.
12
P1
ML/2
1
ML
10
P2
1
2
P = Gauging point
M6 x 25 mm
1
(1/4”-20 x 1” BHCS)
M6 flat washer
M4 x 25 mm SHCS low head
2
(8-32 x 5/8” SHCS low head)
(8-32 x 3/4” SHCS low head)
Page 13
SENC 150
Bore hole pattern
5.2 Mounting the encoder via center support
Mounting
625 mm (24“) † LL
† 1550 mm (60”):
Use end mounting holes
with center support.
P1
ML/2
1
ML
P2
P = Gauging point
10
P3
M6 x 25 mm
1
(1/4”-20 x 1” BHCS)
M6 flat washer
M4 x 25 mm SHCS low head
2
(8-32 x 5/8” SHCS low head)
(8-32 x 3/4” SHCS low head)
1
M6 x 20 mm
3
2
3
(1/4”-20 x 3/4” BHCS)
M6 flat washer
13
Page 14
6 Mounting the encoder with backup spar
SENC 150
MountingMounting possibility
Space of ≤4.5 mm (≤0.18”) use
reading head leveling screws!
Flush or offset mounting with a backup spar.
Bracket used to reduce head to mounting surface gap.
Bore hole pattern
LL > 1550 mm (60”): A backup spar is required.
P1
3
3
3
P2
P3
6
1
1
1
2
M6 x 25 mm
1
(1/4”-20 x 1” BHCS)
M6 flat washer
M4 x 25 mm SHCS low head
2
(8-32 x 5/8” SHCS low head)
(8-32 x 3/4” SHCS low head)
M4 x 8 mm SHSS
3
P = Gauging point
14
Page 15
SENC 150
7 Mounting the reading head
Leveling screwsMounting the reading head with hex nut
M4 hex nut
M3 x 12 mm SHSS
Adjust the leveling set screws as follows:
Insert, but do not tighten 8-32 (M4) reading head screws
as shown on the right side.
Place a 0.025 mm - 0.075 mm (0.001”- 0.003”) shim between
the leveling set screws and mounting surface.
Adjust each set screw until a slight drag is felt on the shim.
Remove the shim before tighten the reading head screws.
Mounting the reading head
M4 x 25 mm SHCS low head
(8-32 x 5/8” SHCS low head)
(8-32 x 3/4” SHCS low head)
M4 x 25 mm SHCS low head
(8-32 x 5/8” SHCS low head)
(8-32 x 3/4” SHCS low head)
Do not tighten prior to adjusting leveling set screws.
Evenly tighten the 8-32 (M4) reading head mounting screws.
Removing the alignment brackets
Slide brackets away from reading head and cable.
Slide the brackets away from the reading head.
Remove the alignment brackets and save for future use.
15
Page 16
8 Checking the mounting
Connecting the encoder
Route the cables with slack loops
to allow for axis motion.
Secure excess cable by fastening
with clips or ties.
Attach the linear encoder connectors
to the readout.
Checking the electrical shielding
Connect a ground wire from the
terminal on the back of the readout to
the machine or earth ground.
Attach a ground wire from the machine
to a solid earth ground.
With the encoder attached to the ma chine and the cable connected to the
readout, check shielding by measuring
resistance between connector housing
and scale unit.
SENC 150
Desired value: 1 Ω max.
16
Page 17
SENC 150
Mechanical specificationsDigital
Resolution0.5 µm1 µm5 µm
Grating pitch20 µm
Scale mediumLight transmission reflective off of nickel coated glass
Accuracy (@ 20° C) / 1000 mm± 3µm, ± 5µm
Max. traversing speed60 m/min
Force required to move reading head<3.4 N
Operating environment
Temperature
Relative humidity
Storage environment
Temperature
Humidity
Weight w/armor
Connecting cable armored or vinylLength = 4 m resp. 6 m from ML 1250 mm; connector: DE-9P
Max. cable length
Measuring lengths50 mm – 3075 mm (1”–120”)
Reference pulse intervaldistance coded 50 mm
Voltage supplyDC 5.1 V ±0.1 V / <220 mADC 5.1 V ±0.1 V /< 180 mA
Protection EN 60529IP 53 when mounted as per instructions
0° to 50° C
25 % to 95 % (non-condensing)
-20° to 70° C
20 % to 95 % (non-condensing)
Scale case: 180 g + 0.65 g/mm ML
Reading head: 60 g
Backup spar: 1 g/mm L
Cable: vinyl: 50 g/m