Resistors put the brake on industrial drives
A
Pentagon Electrical Products product story
Edited by the Engineeringtalk editorial team
Feb 6, 2006
Dynamic braking resistors are available with continuous ratings from 200 to 16,000W.
Pentagon Electrical Products can now supply dynamic braking resistors with continuous ratings from 200 to 16,000W.
The units are based on the company's proven range of vitreous enamelled resistors which are mounted singly or as multiple banks within ventilated metal enclosures.
With resistance values from 1.5 to 1200ohm, adequate dynamic braking capacity can be achieved for inverters and drives covering a wide range of industrial and engineering applications.
The nickel-chrome resistor windings are protected with multiple layers of enamel prior to firing, to produce a highly reliable resistor.
These are designed to withstand the thermal shocks and adverse conditions encountered within the anticipated working environment.
Optional thermal cutouts can also be provided, for connection in the trip circuit of a circuit breaker on a 230V AC supply.
The PDB enclosures used are manufactured from zinc coated perforated steel which is black powder coated.
These are suitable for wall or base mounting and provide IP20 level of ingress protection.
A substantial increase in power ratings can be accommodated for short term or intermittent operation.
Typically, these range from a 20:1 to 12:1 increase in the continuous load rating when a braking load is limited to a short term duration of 5 or 20 seconds no more than once per hour.
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