Application: STERLING Drum Controllers are used in all types of electric operated cranes like many other Manufacturers to control all motions. They are also used in hoists and winches as well as for speed control of slip ring or squirrel cage motors in various machines.
Construction: STERLING Drum Controller is housed in a sheet steel enclosure with top and bottom plates of cast iron. The front cover is easily removable giving ample space for maintenance.
The brake drum and couplings is the large diameter giving generous wearing surface and an increased arcing distance between the segments and tips. The drum contacts are of heavy gauge hard drawn copper, screwed to the cast iron drum with counter sunk head screws. Exact location of the contacts at each step is ensured by the provision of a ratchet wheel engaging on adjustable spring loaded pawl-lever fitted with roller. The square drum shaft is provided with square Bakelite tube to insulate the drum castings.
The main contact fingers are of hinged pattern rigidly clamped to the Bakelite insulated steel square bar. Each finger consists of heavy section brass bar fitted with renewable hard drawn half round copper tip. The fingers engage with the rotary drum under helical spring pressure. The laminated copper shunts carry the current from the fingers to the terminal bases. The terminal bases are also of extruded brass. The brass parts and copper contacts are cadmium plated.
Substantial arc shields on all main contacts are provided. The whole arc shield assembly can be removed for inspection of contacts and any damaged section of arc shield can be very easily replaced. All Drum Controllers are suitable for 400/440 Volts, 3 Phase, 50 cycles AC supply.
Features:
STERLING Drum Controllers Manufacturer are provided with ‘ZERO’ interlocking contacts. Options available are shunt limit switch contacts, dead main’s handle, double rotor and dust proof cover. The Drum Controllers are of rebuts construction for long life but are easy for operation with low maintenance.
