AM4·series grating system
High-precision small-volume series grating ruler and reading head
Primary advantages
- AM4 series grating system is a compact grating for high dynamic precision system, single-field scanning application and low-latency subdivision processing, so that it has excellent dynamic performance.
- The AM4 series grating system is adapted to the M4 series ultra-thin stainless steel scale with a 40μm grating pitch. The expansion coefficient is exactly the same as that of the substrate, and no separate temperature compensation is required.
- Corrosion-resistant, wear-resistant scale, high-strength scale, can effectively prevent the damage of the scale, making it still applicable in places with harsh environments. The scale surface is uncoated and when contaminated, the scale can be cleaned with solvents.
Specification
| Dimensions: | Length 34mm × Width 13mm × Height 11.6mm |
| Grid pitch: | 40μm |
| Weight: | reading head 10g，Cable 18g/m |
| Power supply: | 5V±10% 300mA，A, B, Z signal with 120ohm load |
| Output signal: | differential TTL, origin signal (optional) |
| Connector: | D-sub 15 Pin Male，D-sub 9 Pin Male |
| Scale accuracy grade: | ±10μm/m |
| Scale size: | width 6mm, thickness 0.2mm (including adhesive) |
| Resolution: | 1μm, 0.5μm |
| Electronic subdivision error: | <80nm |
| Maximum speed: | 2.5m/s，Related to resolution and counter minimum clock frequency |
| Reference origin (optional): | Magnetic sensor on the side of the readhead |
| Reference origin unidirectional repeatability: | 1LSB (≤20mm/s) |
Cable parameters
| Cable outer diameter: | 3.0mm±0.2mm |
| Bending times: | 20 million times, the bending radius is greater than 25mm |
Environmental parameters
| Storage temperature: | -20°C to 70°C |
| Operating temperature: | 0°C to 70°C |
| Vibration level: | 55Hz to 2000Hz max. 100m/s² 3 axes |
| Protection class: | IP40 |
Installation size
Recommended thread engagement length minimum 5, tightening torque 0.25 to 0.4Nm
*All above dimensions are in millimeters
Installation Precautions
1. Scale placement tools must be used for scale placement, and freehand placement is prohibited.
2. Because there may be mounting stress, it takes 24 hours after the scale is mounted before proceeding. Accuracy calibration is performed, and it takes longer at lower temperatures.
3. For the long-term reliability of the application, the main body of the application (linear motor, machine) needs to be Reliable grounding and shielding are required to prevent the reading head from being disturbed, and the power line It should be separated from the signal line as much as possible.
4. The power supply terminal of the reading head needs to meet 5V±10%, and the current is not less than 300mA.
5. Dirt on the scale may cause noise or failure of the output signal of the reading head. Scale cleaning, the scale can use dust-free paper with ethanol, isopropanol clean.
6. The fixing screw of the reading head must follow the length and torque given in the installation drawing, otherwise Damage or poor seating of the readhead may result.
Reading head interface line sequence
D-SUB 15 plug R wire sequence
| Pin number | Function | Pin number | Function |
| Pin1 | / | Pin9 | 0V is internally connected to Pin2 |
| Pin2 | 0V | Pin10 | / |
| Pin3 | / | Pin11 | / |
| Pin4 | Differential TTL Z- | Pin12 | Differential TTL Z+ |
| Pin5 | Differential TTL B- | Pin13 | Differential TTL B+ |
| Pin6 | Differential TTL A- | Pin14 | Differential TTL A+ |
| Pin7 | +5V±10% | Pin15 | / |
| Pin8 | +5V is internally connected to Pin7 | shell | outer shield |
D-SUB 9 plug M line sequence
| Pin number | Function | Pin number | Function |
| Pin1 | 0V | Pin6 | Differential TTL A- |
| Pin2 | Differential TTL A+ | Pin7 | Differential TTL Z- |
| Pin3 | Differential TTL Z+ | Pin8 | Differential TTL B- |
| Pin4 | Differential TTL B+ | Pin9 | / |
| Pin5 | +5V±10% | shell | outer shield |
D-SUB 9 plug T wire sequence
| Pin number | Function | Pin number | Function |
| Pin1 | Differential TTL A- | Pin6 | Differential TTL A+ |
| Pin2 | 0V | Pin7 | +5V±10% |
| Pin3 | Differential TTL B- | Pin8 | Differential TTL B+ |
| Pin4 | / | Pin9 | Differential TTL Z+ |
| Pin5 | Differential TTL Z- | shell | outer shield |
Readhead differential TLL electrical connections
Readhead indicator light
Readhead indicator lights indicate signal strength
| solid red light | The signal strength is less than 30%, the reading head is not working properly, the scale needs to be cleaned or the position of the reading head should be adjusted |
| solid yellow light | Signal strength <50%, the reading head can work normally, need to clean the scale or adjust the position of the reading head |
| solid green light | Signal strength < 80%, the reading head can work normally |
| solid blue light | Signal strength ≥ 80%, the reading head can work normally |
Repair and Maintenance
