GEARS , DRIVES & MOTORS
Herga Technology ’ s 6256 heavy-duty industrial footswitch has AC15 utilisation category rating
Herga Technology ’ s 6256 series heavyduty footswitch range is especially suited to switching the inductive loads typically required for low-voltage industrial motors and other electromechanical control apparatus . Its AC-15 utilisation category covers electromagnetic loads from 250 VAC at 6 A to 500 VAC at 1 A , and with CE / UL and CSA C22 60947-1 & 60947-5-1 standards approval , safe and long reliable working life is ensured . The IP67 waterproof-rated 6256 footswitch is manufactured in injection moulded , highimpact ABS with a choice of open or safetyguarded models offering extreme levels of toughness and durability for switching tasks on industrial machinery . A comprehensive choice of accessories allow individually configured footswitches to perform as singlepedals or assembled as multi-pedal switching groups thanks to a modular and aesthetic interlocking design . A broad selection of electrical ratings , potentiometer options and switch operations ensure maximum working flexibility .
The flexibility for electrical switching on the 6256 series includes slow break & make and snap action options to AC-15 6A 250V / DC-12 6A 24V ( UL ) as well as a high-power model for 25A 125 / 250V AC . 1HP 125 / 250V AC ( with
Herga Technology ’ s 6256 in 4- footswitch configuration with safety guards on two footswitches .
double pole change over contacts over two switches ). 5 kΩ and 10 kΩ potentiometer versions with double pole change over contacts are also available . The series has a rated insulation voltage of 500 VAC 600 VDC ( 300V UL Rating ), and further protection via a short circuit current rating to 1 kA and a shortcircuit protective device 10 A aM fuse . The footswitch has a specified mechanical working life of 2 million cycles and an electrical life of 10 million cycles .
For additional safety in especially hazardous environments the 6256 is available with a pressure point actuated cut-off feature where
the switching contact is broken and the footswitch locks , preventing an unintended restart . This option is also available configured with a mechanical resistance that adds tactile feedback where the operator can sense the pressure change . A manual release can also be included after the footswitch locks . Other safety related options include emergency stop equipped models with a conventional emergency stop switch either assembled on the footswitch housing – available on both the guarded and unguarded versions - or attached to an extended pole . Other accessories include extended base plates for securing the footswitch directly to machine or floor surface as well as pole & handle attachments for increased portability and ease of operation .
Displaying the heavy-duty characteristics of 6256 footswitch , which has a specified drop weight stability of 20 kg at 1 metre for the guarded model , a demonstration video on Herga ’ s website compares its drop test performance against several competitive lines - some with all-steel construction . For comprehensive information on the 6256 series and application specific assistance , visit www . herga . com , email sales @ herga . com or call + 44 ( 0 ) 1284 701422 .
For further information , please visit www . herga . com
Pump motor with special flange for chemical plant
Menzel Elektromotoren has realized an unusual motor configuration to help out a customer : Currenta , Headquartered in Leverkusen , needed a replacement for a failed pump motor in one of its chemical plants but found it difficult , at first , to find a suitable machine to able to accommodate an existing oversized pump flange dimension .
Only the family-run company Menzel offered a size 400 motor which could match the required profile , whilst maintaining a lightweight design . The Berlin-based manufacturer converted a stock , IM B3 type motor ( foot mounting ) to type IM V1 ( vertical flange mounting ). For this purpose , the application-side bearing seat was converted to install a thrust bearing .
Menzel also manufactured the special flange in-house , adapting the shaft , which could only protrude 120 mm from the flange . Menzel prepared the motor for quick installation at the customer ’ s site , shifting the main terminal box to the most accessible position whilst mounting a cable entry that could be readily adapted to the existing cable diameter on site .
By installing both the heater and PT100 connections in one auxiliary terminal box , Menzel was able to save one terminal box .
The motor , which is now successfully in operation in the customer ’ s plant , has a rated output of 315 kW and a nominal voltage of 5000 V . It features the cooling type IC 411 , IP55 protection rating and weighs 4900 kg .
More information about squirrel-cage motors with cooling type IC 411 is available at the website below .
www . menzel-motors . com / squirrel-cage-motor / ic411-ic416 /
76 PECM Issue 56