- The VLM500 works optically and contact-free. Based on a CCD sensor it implements the spatial filter principle. Spatial filter is the generic term for a measuring principle for the optical determination of velocity and length of moving objects.
- The spatial filter is based on the filtering effect of lattice-like structures (grid modulation). Basically, the functional principle of the VLM500 can be described as follows: The measuring object is projected on the CCD sensor which functions as an optical grid (no image taking). The VLM500 is equipped with an LED light source for the illumination of the measuring object. Due to the grid modulation a signal frequency, which is proportional to the speed, occurs upon movement of the object. The device calculates the velocity from the measured signal frequency. Several control circuits allow for automatic adjustment to most diverse materials.
- The VLM500 does not put high requirements on the surface character of the measuring object: Precise measurement is facilitated on periodic structures as well as on stochastic surfaces of metals, wood, rubber or paper.
Thông số kỹ thuật
- Nominal distance : max. 330 mm
- Working range : max. ±30 mm
- Measuring range : 0.08 m/min ... 3000 m/min
- Measuring uncertainty : < 0.025 % in nominal distance
- Reproducibility : < 0.025 %
- Averaging-/Update-Time : > 0.2 ms with additional 1 ... 32 times sliding average
- Length measuring range : Internal length range up to 2,000,000 km
- Detector / principle : CCD sensor / spatial filter with semiconductor grid as reference
- Illumination : White light LED (expected life span: > 5 years 3))
- State indicator (LED in cover plate) : Sginal (green), Error signal (red), Communication (yellow), Forward (Green), Backward (green)
- Power supply, consumption : 24 VDC, max. 25 W
- Temperature range : 0 °C ... 50 °C
- Protection class : IP 65
- EMC : Industrial standard in compliance with CE
- Weight, Housing dimensions : approx. 3.3 kg, 260 mm x 160 mm x 90 mm (without connections)
- Programming interface (max. 2) : for parameter setting, data output and firmware update:USB (IUSB), RS-232 (I232), RS-422/RS-485 (I4UN), isolated
- Opto-isolated outputs : 2x (Error, Signal status)
- Opto-isolated inputs : 3x (External trigger signal, Idle mode / Lock6), Definition of the direction of the movement)
- Pulse output (Encoder) : A/B, 2 phases 90°, Resolution 8 ns, 0.2 Hz ... 25 kHz ; Optionally as Open Collector (IPPL), 5V TTL (IP5V) or Push Pull (IPPP)
- Analog output : Current output, adjustable as 0 ... 20 mA, 0 ... 24mA, 4 ... 20 mA (IAUN)
- Fieldbus interface : Profibus (IFBP), Profinet (IFPN), EtherNet/IP (IFEI), Telnet (IFFE),
- Standard scope of delivery : VLM500, Programming interface on customer request, Power supply cable, Connection cable, positioning aid, USB stick with documentation and software, printed manual