Subs & Systems
Marsh Bellofram – Rugged high-reliability alternating relays and duplex controllers (ARM Series)Sep 30 2010 - Subs & Systems [More Subs & Systems Articles]
The ARM Series, a family of rugged, high-reliability alternating relays and duplex controllers, has been introduced by the ATC Diversified Electronics division of Marsh Bellofram. The products are designed to ensure equal runtime of multiple load installations in pump sequencing, level control, lift station, motor protection and other industrial applications.
The series incorporates a microprocessor-based controller which evenly distributes runtime by automatically alternating designated lead and lag loads between two pump sequences. The series also features an inrush delay, which prevents both loads from energizing simultaneously, thus significantly reducing line sag, while allowing for additional load capacity in the event of excess requirements. Units include five UL913 intrinsically safe low-voltage / low-current control switch inputs which are electrically isolated from the control voltage and load alarm contacts. Five LED indicators are included to confirm the functionality of the inputs. Incorporation of hand-of-automatic (HOA) switches allows for manual operation as needed.
Additional features include an integral alarm output, with alarm contacts that close when a control switch fails or system capacity is exceeded; control switch fault detection, which notifies the user of open and shorted control switch failures; and a test-and-clear switch, which verifies device function and resets the control switch fault detection algorithm as needed. The integral device logic of the ARM Series allows for outputs to continue their operation, even if one input fails to open or close. Special controls are also available upon customer request. Available mounting configurations allow for back or front-panel mounting, as required, says the company.Electropages - Electronics Components News, From Leading Electronics Distributors.