Acu-rite Senc 150 User Manual

SENC 150

REFERENCE MANUAL

SENC 150

Page

1 Introduction / Supplied items ........................................ 4

2 Preparing the mounting / Mounting information ........... 5

3 Encoder dimensions ..................................................... 8

4 Backup spar dimensions ............................................. 10

5 Mounting the encoder without backup spar ............... 11

5.1 Mounting the encoder via end holes .......................... 12

5.2 Mounting the encoder via center support .................. 13

6 Mounting the encoder with backup spar .................... 14

7 Mounting the reading head ......................................... 15

8 Checking the mounting .............................................. 16

9 Specifications ............................................................. 17

10 Pin-outs .................................................................... 18

11 Output signals ............................................................ 18

Table of Contents / Warnings

3

1 Introduction / Supplied items

SENC 150

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

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)

**19.05 mm

**0.750”

19 mm

0.750”

LL [mm] LL [“]

50 1

75 2
100 3
125 4
150 5
175 6
200 7
225 8
275 10
300 11
125 12
350 13
375 14

LL [mm] LL [“]

400 400
425 16
475 18
525 20
575 22
600 23
625 24
675 26
725 28
775 30
875 33
925 35
950 36

LL [“] LL [“]

1000 38
1050 40
110 0 42
1250 48
1350 52
140 0 54
1550 60
1675 65
1850 72
2000 78
2150 84
2300 90
2575 100
2825 110
3075 120

 If there is a risk of severe contamination,

attach a protective cover.

5

2 Preparing the mounting / Mounting information

Traverse path

11.75 mm

0.463”

(LL x 25.4 + 138.1)/2 mm

(LL + 5.437”)/2

ML/2 mm

(LL + OT)/2 “

Scale case

C
L

SENC 150

Center marks

ML mm

LL + OT “

ML = Measuring length
OT = Overtravel 1.75”

Center mounting axis

C

L

Mark center of travel

 Move the axis to its center of travel.
 Mark the axis for quick return to center.
 Determine encoder cable exit direction (page 7) and adjust.

6

Alignment brackets (2x)

Cable assembly

Reading head assembly

 Align the center marks on the reading head and scale assembly

by sliding the reading head and brackets along the scale.

F = Machine guideway

 Locate the scale case so underside of end caps are flush

with the axis parting line.

 Mark one end mounting hole location.

Alignment brackets must not be removed until instructed.

SENC 150

Mounting possibilities Determining cable direction

2 Mounting information

Flush
mounting

Offset
mounting

Backup spar
mounting

Space of ≤4.5 mm (≤0.18”) use
reading head leveling screws!

 Use reading head leveling set screws when surfaces are

not flush.

 Detailed information about mounting possibilities on page 11

(Mounting the encoder without backup spar) and on page 14
(Mounting the encoder with backup spar).

 Determine cabel exit direction before mounting the encoder.
 To change the cable exit direction, remove the cover plate

and rotate it by 180°.

K1 - cable exit right side

Do not pull out the PCB!

1

K2 - cable exit left side

1

1

1

1

T-10 torx screw

Do not clamp the wires!

1

T-10 torx screw

max. 70 Ncm!

7

3 Encoder dimensions

SENC 150

8

SENC 150

3 Encoder dimensions

ML = Measuring length [mm]
LL = Measuring length [inch]
OT = Overtravel 1.75”
S = Beginning of measuring length
K = required mating dimensions

H1 = for ML ≥ 625 mm to ≤ 1550 mm use mid-point fastening
for ML ≥ 24” to ≤ 60” use mid-point fastening

= Direction of scanning head motion for output signals
in accordance with interface description

F = Machine guideway

9

4 Backup spar dimensions

SENC 150

Encoder

ML (mm)

Encoder
LL (inch)L(mm)L(inch)L1(mm)L1(inch)L2(mm)L2(inch)

50 1 185.50 7.303 29.25 1.152 127 52

75 2 211.50 8.327 42.25 1.663 127 52
100 3 236.50 9.311 54.75 2.156 127 52
124 4 261.5 10.295 67.25 2.648 127 52
150 5 287.50 11.319 80.25 3.159 12 7 52
175 6 312.50 12.303 29.25 1.152 254 10 2
200 7 388.50 13.327 42.25 1.663 254 10 2
225 8 363.5 14.311 54.75 2.156 254 10 2
275 10 414.50 16.319 80.25 3.159 254 10 2
300 11 439.50 17.303 92.75 3.652 254 10 2
325 12 465.50 18.327 105.75 4.163 254 10 2
350 13 490.50 19.311 36.60 1.441 417.3 10 2
375 14 515.50 20.295 130.75 5.148 254 10 2
400 15 541.50 21.319 16.75 0.659 254 10 3
425 16 566.50 22.303 29.25 1.152 254 10 3
475 18 617.50 24.311 54.75 2.156 254 10 3
525 20 668.50 26.319 80.25 3.159 254 10 3
575 22 719.50 28.327 105.75 4.163 254 10 3
600 23 744.50 29.311 118.25 4.656 254 10 3
625 24 769.50 30.295 130.75 5.148 254 10 4
675 26 820.50 32.303 29.25 1.152 254 10 4

No.

holes B

Encoder

ML (mm)

Encoder
LL (inch)L(mm)L(inch)L1(mm)L1(inch)L2(mm)L2(inch)

725 28 871.50 34.311 54.75 2.156 254 10 4
775 30 922.50 36.319 80.25 3.159 254 10 4
875 33 998.50 39.311 118.25 4.656 254 10 4
925 35 1049.50 41.319 11.25 0.443 256.75 10.108 5

950 36 1074.50 42.303 29.25 1.152 254 10 5
1000 38 1125.50 44.311 54.75 2.156 254 10 5
1050 40 1176.50 46.319 80.25 3.159 254 10 5
110 0 42 1227.50 48.327 105,75 4.163 254 10 5
1250 48 1379.50 54.311 54.75 2.156 254 10 6
1350 52 1481.50 58.327 105.75 4.163 254 10 6
140 0 54 1531.50 60.295 130.75 5.148 254 10 6
1550 60 1684.50 66.319 80.25 3.159 254 10 7
1675 65 1811.50 71.319 143.75 5.659 254 10 7
1850 72 1989.50 78.327 105.75 4.163 254 10 8
2000 78 2141.50 84.311 54.75 2.156 254 10 9
2150 84 2293.50 90.295 130.75 5.148 254 10 9
2300 90 2446.5 96.319 80.25 3.159 254 10 10
2575 100 2700.50 106.319 80.25 3.159 254 10 11
2825 11 0 2954.50 116.319 80.25 3.159 254 10 12
3075 120 3208.50 126.319 80.25 3.159 254 10 13

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

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

1 3

(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

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)

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

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

SENC 150

7 Mounting the reading head

Leveling screws Mounting 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

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

SENC 150

Mechanical specifications Digital

Resolution 0.5 µm 1 µm 5 µm

Grating pitch 20 µm

Scale medium Light transmission reflective off of nickel coated glass

Accuracy (@ 20° C) / 1000 mm ± 3µm, ± 5µm

Max. traversing speed 60 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 vinyl Length = 4 m resp. 6 m from ML 1250 mm; connector: DE-9P

Max. cable length

Measuring lengths 50 mm – 3075 mm (1”–120”)

Reference pulse interval distance coded 50 mm

Voltage supply DC 5.1 V ±0.1 V / <220 mA DC 5.1 V ±0.1 V /< 180 mA

Protection EN 60529 IP 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

armored: 140 g/m

Connector: 55 g

≤ 9 m

9 Specifications

17

10 Pin-outs
11 Output signals

Digital Differential

Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9

n/c green yellow blue red white brown pink gray
n/c channel

1

A+

5

channel

A-

channel

B+

channel

B-

ground Vcc, +5.1

±0.1 VDC

channel

R+

SENC 150

channel

R-

6

9

Outout signals

Parameter Digital

Output signals I

Incremental signals
Signal levels

Reference mark signal
Signal level

=(High level output current) = 20 mA

OH

VOH=(High level output voltage) >2.5 Vdc

IOL=(Low level output current) = -20 mA
VOL=(Low level output voltage) < 0.6 Vdc

Square-wave voltage signals. Channels A and B, in 90° quadrature relationship
TTL-level

Square-wave pulse
TTL-level

Channel A+

Channel A-

Channel B+

Channel B-

18

360°

0°
1
0

1
0

90°
1
0

1
0

Channel R+

Channel R-

1
0

1
0

1 count
(phased)

SENC 150

19

ID: 516291-22  D516291-02-A-01 05/2017