Friday, October 20, 2006
Controllers promise versatile motor protection
The new Simply Smart TeSys Model U controllers from Telemecanique, a brand of Schneider Electric, provide versatile motor protection that can be matched to the exact needs of the application. Cost-saving integrated inputs and outputs for control functions along with convenient communication facilities are among the key benefits of the new controllers. The introduction of the new controllers means that these important benefits, already provided for motors up to 15kW by the popular TeSys Model U range of integrated motor starters, are now available for motors rated up to 480kW.
Conventional motor starters still outnumber variable speed drives (VSDs) by a very wide margin.
Until now, however, the communications, control and protection options typically offered by VSDs have been complicated and expensive to replicate in conventional starters.
TeSys Model U products provide a complete solution to this problem.
Designed to operate from current transformers, the new TeSys Model U controllers comprise a base unit, into which are plugged control, function and communication modules, as required to meet the needs of the application.
By selecting suitable current transformers, the controllers can be used with motors having full load currents from 1A to 800A, eliminating the need for users to order and stock different types of motor protection relay for motors with different ratings.
When used in conjunction with correctly selected Telemecanique contactors and short-circuit protection devices, TeSys Model U controllers provide Type 2 co-ordination.
This reduces the risks associated with serious faults, while keeping plant downtime to a minimum by making it possible to return equipment to service quickly after a fault has been cleared.
Basic control units for TeSys Model U controllers are available to provide either class 10 or class 20 motor protection and can be set from 35% to 105% of rated current, while multifunction control units offer selectable trip class together with jam, underload and earth-fault protection.
Additional features, including alarm outputs and motor load indication, can be added by using the appropriate function module.
The communication module for the TeSys Model U controller range provides a Modbus interface; and adds two auxiliary inputs plus one auxiliary output to the ten inputs and five outputs built into the base unit.
Conventional motor starters still outnumber variable speed drives (VSDs) by a very wide margin.
Until now, however, the communications, control and protection options typically offered by VSDs have been complicated and expensive to replicate in conventional starters.
TeSys Model U products provide a complete solution to this problem.
Designed to operate from current transformers, the new TeSys Model U controllers comprise a base unit, into which are plugged control, function and communication modules, as required to meet the needs of the application.
By selecting suitable current transformers, the controllers can be used with motors having full load currents from 1A to 800A, eliminating the need for users to order and stock different types of motor protection relay for motors with different ratings.
When used in conjunction with correctly selected Telemecanique contactors and short-circuit protection devices, TeSys Model U controllers provide Type 2 co-ordination.
This reduces the risks associated with serious faults, while keeping plant downtime to a minimum by making it possible to return equipment to service quickly after a fault has been cleared.
Basic control units for TeSys Model U controllers are available to provide either class 10 or class 20 motor protection and can be set from 35% to 105% of rated current, while multifunction control units offer selectable trip class together with jam, underload and earth-fault protection.
Additional features, including alarm outputs and motor load indication, can be added by using the appropriate function module.
The communication module for the TeSys Model U controller range provides a Modbus interface; and adds two auxiliary inputs plus one auxiliary output to the ten inputs and five outputs built into the base unit.
# posted by Medical Information : 1:57 AM
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