Incremental linear encoder
Slim type
SR74
Encoder Instructions
SR74 Incremental Linear Encoder
- Slim type allows installation in narrow spaces
- Magnetic system allows use even in environments with condensation, oil, and other adverse conditions
- Same thermal expansion coefficient as iron
Dimensions (cable left-lead out direction)
A/B/Reference point
| Effective length | Total length | Mounting pitch | Number of intermediate foot plates | |||
| L | L1 | L2 | L3 | L4 | L5 | n |
| 70 | 208 | 185 | − | − | − | 0 |
| 120 | 258 | 235 | − | − | − | 0 |
| 170 | 308 | 285 | − | − | − | 0 |
| 220 | 358 | 335 | − | − | − | 0 |
| 270 | 408 | 385 | − | − | − | 0 |
| 320 | 458 | 435 | − | − | − | 0 |
| 370 | 508 | 485 | − | − | − | 0 |
| 420 | 558 | 535 | − | − | − | 0 |
| 470 | 608 | 585 | − | − | − | 0 |
| 520 | 658 | 635 | − | − | − | 0 |
| 570 | 708 | 685 | − | − | − | 0 |
| 620 | 758 | 735 | − | − | − | 0 |
| 720 | 858 | 835 | 417.5 | − | 417.5 | 1 |
| 770 | 908 | 885 | 442.5 | − | 442.5 | 1 |
| 820 | 958 | 935 | 467.5 | − | 467.5 | 1 |
| 920 | 1,058 | 1,035 | 517.5 | − | 517.5 | 1 |
| 1,020 | 1,158 | 1,135 | 567.5 | − | 567.5 | 1 |
| 1,140 | 1,278 | 1,255 | 627.5 | − | 627.5 | 1 |
| 1,240 | 1,378 | 1,355 | 677.5 | − | 677.5 | 1 |
| 1,340 | 1,478 | 1,455 | 727.5 | − | 727.5 | 1 |
| 1,440 | 1,578 | 1,555 | 520 | 520 | 515 | 2 |
| 1,540 | 1,678 | 1,655 | 550 | 550 | 555 | 2 |
| 1,640 | 1,778 | 1,755 | 585 | 585 | 585 | 2 |
| 1,740 | 1,878 | 1,855 | 620 | 620 | 615 | 2 |
| 1,840 | 1,978 | 1,955 | 650 | 650 | 655 | 2 |
| 2,040 | 2,178 | 2,155 | 720 | 720 | 715 | 2 |
Unit: mm
MG: Machine guide * Intermediate foot plate: One location when L 720 mm, two locations when L 1440 mm
Notes • The surface indicated by the ▲ marks is the installation surface.
- Screws indicated in the diagram are supplied as standard accessories.
- Movement outside the effective length (L) will damage the scale head. It is recommended that the mechanical movable length (stroke) be set to 10 mm or more to the
inside of both ends of the effective length (L).
Specifications
| Model name | SR74 |
| Effective length (L: mm) | 70-2,040 |
| Thermal expansion coefficient | 12±1 × 10-6 /℃ |
| Accuracy(at 20℃) | (3+3L/1,000) μｍp-p or (5+5L/1,000) μｍp-p L: Effective length (mm) |
| Reference point | Center point, Multi point (40 mm pitch), Signed-type (standard pitch 20 mm), User-selected point (1 mm pitch) |
| Output signal | A/B/Reference point line driver signal, compliant with EIA-422 |
| Resolution | Selectable from 0.05, 0.1, 0.5, and 1 μm (Set at factory shipping) |
| Maximum response speed | 50m/ min (Resolution: 0.1 μm, Minimum phase difference: at 50 ns) |
|
Product Safety |
FCC Part15 Subpart B Class A ICES-003 Class A Digital Device EN/BS 61000-6-2, EN/BS 61000-6-4 |
| Product Environment | EN/BS 63000 |
| Operating temperature range | 0 to +50℃ |
| Storage temperature range | -20 to +55℃ |
| Vibration resistance | 150 m/s2 (50 Hz to 3,000Hz) |
| Impact resistance | 350 m/s2 (11 ms) |
| Protective design grade | IP54 (Air purge not included), IP65 (Air purge included) |
| Power supply voltage range | DC+4.75 to +5.25 V |
| Maximum consumption current | 1.0W or less (4.75V or 5.25V) |
| Consumption current | 200mA (5V) (when the controller is connected) |
| Mass | Approx. 0.27kg+ 1.36kg/m or less |
| Standard compatible cable | CH33-***CP/CE |
| Maximum cable length | 15 m |
* Magnescale reserves the right to change product specifications without prior notice.
Details of model designation
Scale
SR74 – × × ×★○□♦♯♯♯
［×××］Effective length (L): cm units
［★］Cable lead-out direction
| Type | Lead-out direction |
| R | Right |
| L | Left |
［○］Accuracy grade
| Type | Accuracy grade |
| A（5 | +5L/1,000）µmp-p |
| S（3 | +3L/1,000）µmp-p |
L: Effective length(mm)
［□］Resolution and direction (µｍ)
| Type | Direction | Resolution | Type | Direction | Resolution |
| B | ＋ | 0.05 | G | － | 0.05 |
| C | 0.1 | H | 0.1 | ||
| D | 0.5 | J | 0.5 | ||
| E | 1.0 | K | 1 |
［◆］Minimum phase difference
| Type | Phase difference (ns) | Type | Phase difference (ns) | Type | Phase difference (ns) |
| A | 50 | F | 300 | L | 1,250 |
| B | 100 | G | 400 | M | 2,500 |
| C | 150 | H | 500 | N | 3,000 |
| D | 200 | J | 650 | ||
| E | 250 | K | 1,000 | ||
［♯♯♯］Reference point position
（Distance from left end of effective length：Unit mm）
| Reference point position | Indication method |
| Less than 1,000 | Number (850 mm → 850) |
| 1,000－1,099 mm | A + lower 2 digits（1,050 mm → A50） |
| 1,100－1,199 mm | B + lower 2 digits |
| 1,200－1,299 mm | C + lower 2 digits |
| 1,300－1,399 mm | D + lower 2 digits |
| 1,400－1,499 mm | E+ lower 2 digits |
| 1,500－1,599 mm | F + lower 2 digits |
| 1,600－1,699 mm | G+ lower 2 digits |
| 1,700－1,799 mm | H + lower 2 digits |
| 1,800－1,899 mm | J + lower 2 digits |
| 1,900ー1,999 mm | K + lower 2 digits |
| 2,000－2,040 mm | L+ lower 2 digits |
| Center | X |
| Multi | Y |
| Signed-type | Z |
Cable
CH33 – □□○▽※＃
［□□］Cable length Written by flush right, indication in “m” units, up to 30 m, 1 m pitch (Example)
| Type | Cable length |
| 07 | 7m |
| 26 | 26m |
［○］Conduit
| Type | Conduit |
| C | With conduit (standard) |
| N | Without conduit |
【▽】Cable seath (covering)
| Type | |
| P | PVC (Polyvinyl chloride) |
| E | PU (Polyurethane) |
【※】Controller side connector
| Type | Specification | Remarks | |
| Without | With | Earth wire | |
| None | – | Open-end | Standard |
| A | – | D-sub 15P | |
| D | – | D-sub 9P | |
| L | – | 10P made by Sumitomo 3M | Mitsubishi NC, J3 (A/B Phase) |
| E | P | 20P straight case made by Honda Tsushin Kogyo | FANUC (A/B Phase) |
| H | R | Horizontal drawing case made by HIROSE Electric | FANUC (A/B Phase) |
【＃】Scale side connector
| Type | Specification | Remarks |
| None | Original of Magnescale | Standard |
*Relay type cannot be used for A/B Phase type of SR74 and SR84
example）
Cable length 10ｍ Without conduit
PU sheath Scale side connector Original of Magnescale
Other Models
Absolute linear encoder slim type
SR77
FANUC
Mitsubishi Electric
Panasonic
Yaskawa Electric
- Effective length： 70,120,170,220,270,320,370,420,470,520, 570,620,720,770,820,920,1020,1140,1240, 1340,1440,1540,1640,1740,1840,2040 mm
- Maximum resolution： 0.01μm
- Accuracy： (3+3L/1,000) μmp-p L:mm (5+5L/1,000) μmp-p L:mm
- Maximum response speed： 200m/min
- Protective design grade： IP65
Cable:
CH33 (Mitsubishi Electric, Panasonic, Yaskawa Electric) CH33A (FANUC)
※ Please refer to page 29 for cable specifications.
Absolute linear encoder robust type
SR87
FANUC
Mitsubishi Electric
Panasonic
Yaskawa Electric
- Effective length：140,240,340,440,540,640,740,840,940,1040, 1140,1240,1340,1440,1540,1640,1740,1840, 2040,2240,2440,2640,2840,3040 mm
- Maximum resolution： 0.01μm
- Accuracy： (3+3L/1,000) μmp-p L:mm (5+5L/1,000) μmp-p L:mm
- Maximum response speed： 200m/min
- Protective design grade： IP65
Cable:
CH33 (Mitsubishi Electric, Panasonic, Yaskawa Electric) CH33A (FANUC)
※ Please refer to page 29 for cable specifications.
Incremental linear encoder slim type
SR75
Mitsubishi Electric
Panasonic
Yaskawa Electric
- Effective length：70,120,170,220,270,320,370,420,470,520, 570,620,720,770,820,920,1020,1140,1240, 1340,1440,1540,1640,1740,1840,2040 mm
- Maximum resolution： 0.01μm
- Accuracy： (3+3L/1,000) μmp-p L:mm (5+5L/1,000) μmp-p L:mm
- Maximum response speed： 200m/min
- Protective design grade： IP65 Cable: CH33
※ Please refer to page 29 for cable specifications.
Incremental angle encoder enclosed type
RU74
A/B/Reference point
- Hollow diameter： φ20
- Resolution： Approx.1/1,000° , Approx.1/10,000°
- Accuracy: ±2.5″
- Maximum response revolution： As the table on the right
- Protective design grade： IP65
Documents / Resources
 |
Magnescale SR74 Incremental Linear Encoder [pdf] Instructions SR74 Incremental Linear Encoder, SR74, Incremental Linear Encoder, Linear Encoder, Encoder |
