Tachogenerators & Encoders
Encoders are used to measure speed or track position. Tachogenerators are used to sense the mechanical speed and rotation of a motor. Both Tacho Generators and Encoders are used to provide precision speed feedback, and therefore are an important safety feature in a production process where over speed detection and a critical set trip point can be determined.
Hoist over-speed system
The hot charge hoists (at Lion), as well as the main hoists on the 130t Hot Charge Cranes, have a sophisticated mechanical brake arrangement. The high-speed shafts are equipped with both service and safety thruster brakes. In addition, disc calliper brakes operate directly on to flanges on the rope drums.
With correct control, emergency disc brakes provide maximum security, in the event of an over-speed or emergency trip situation. They ensure the rope drum, and not just the motor, is stopped.
Over-speed means the rope drum is turning at a speed faster than the related rated motor speed, driving through the drive train. The hoists are AC10-controlled, and via independent tacho feedback, it monitors all motor speeds. The A128 Speed Loop Supervisor has a fixed trip at 120% speed. The system is stopped, with brakes applied. The drive must be reset, to allow a re-start.
This is a strong security measure for any Class 4 AC hoist, with a slip-ring drive motor, and with thrustor brake(s) operating on the high speed drum.
Hoists fitted with caliper disc brakes operating on the rope drum must have independent (out of the control) over-speed detection, with a critical set trip point.
The Demag hoists have excellent EB brake systems. The rope drum speed is monitored by a direct-driven Baumer POG 10 + DSL Incremental Encoder with Integrated Speed Switch.
Via a laptop, the device is precision set to trip at 110% speed. The contacts in it are self-monitoring for total security, and it has independent encoder output terminals.
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