INDUSTRY UPDATE
Machine safety without SIL: Wachendorff’s WDG series redundant encoders provide cost-effective safety
W
achendorff, the German measurement systems manufacturer,
has recently launched redundant versions of its well proven WDGR and WDGE series incremental and absolute encoders. Available from Variohm EuroSensor, Wachendorff’s exclusive UK distributor, the new series combine disparate optical and magnetic measurement principles that are independently correlated yet fully synchronised through separate processing electronics. Providing true redundancy and utilising as few similar components as possible, Wachendorff see the new products as a compelling and cost effective alternative to expensive Performance Level d or SIL 3 based safety systems - with the two tried and tested measurement principles extensively used across thousands of industrial speed and position feedback tasks over many years. Two encoder versions are available: the WDGR combines incremental magnetic and
incremental optical encoders whilst the WDGE combines absolute magnetic and incremental optical technologies. Both have 58 mm diameter clamping flange mounting with a choice of shafts from 6 mm to 9.525 mm diameter. The resolution for the WDGR is up to 1024 ppr magnetic and up to 5000 ppr for the optical encoder. For the WDGE series the magnetic absolute encoder has a 16 bit single-turn and a 43 bit multi-turn resolution, whilst the incremental encoder resolution is up to 5000 ppr. The 58 mm diameter WDG series is especially durable with high interference immunity
thanks to a magnetically shielded and chrome plated steel housing. A zinc plated connector cover houses a choice of PG cable glands or M12 x1 connectors for each encoder. The entire housing has an IP67 protection rating with IP65 for the shaft assembly where a stainless steel shaft is supported on a pair of precision ball bearings for up to 220 N radial and 120 N axial load ratings. With a maximum operating speed to 8000 rpm, the nominal bearing life is 1 x 10-9 revs. at full load with 1 x 10-11 revs. for 20% load.
Variohm EuroSensor u 01327 351004 u
sales@variohm.com u
www.variohm.com
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