Motor Starter Coordination
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Motor Starter Coordination -Implications -Benefits. Coordination -A practical definition:. “Selection of starter components: The short circuit protection element, (eg:Fuses/ Circuit breaker) The switching (Contactor)element The motor protection (Thermal Overload/ circuit breaker)element

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Motor Starter Coordination -Implications -Benefits

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Motor starter coordination implications benefits

Motor Starter Coordination

-Implications

-Benefits


Coordination a practical definition

Coordination -A practical definition:

“Selection of starter components:

  • The short circuit protection element, (eg:Fuses/ Circuit breaker)

  • The switching (Contactor)element

  • The motor protection (Thermal Overload/ circuit breaker)element

    ..such that the occurence of a short circuit fault will result in a predictable outcome”.

    However different levels of coordination will lead to different results following a short circuit fault


Type 2 coordination definition according to bs en 60947 4 1

Type 2 coordination- Definition according to BS/EN 60947-4-1

  • « Effective limitation of the fault condition with no damage resulting to the components of the motor starter other than light tack welding of contactor main contacts which can easily be broken»

    However:

  • 3 levels of coordination are considered by the standards

    • Type 1 coordination to BS EN 60947-4-1

    • Type 2 coordination to BS EN 60947-4-1

    • Total coordination to BS EN 60947-6-2


Bs en 60947 4 1 minimum requirements

Allows damage to all

components when confined within their enclosure

Allows tack welding of main

poles (easily broken) and a change of O/L characteristics

Allows only tack welding of

main poles

(easily broken)

BS/EN 60947-4-1 minimum requirements:

Type 1 coordination

Type 2 coordination


Type 1 coordination minimum performance required following a short circuit fault

Type 1 coordination -minimum performance required following a short circuit fault:

  • Damage to / destruction of starter components is acceptable, but there must be:

    • No danger to personnel eg: ejection of damaged components from the enclosure (Note risk if panel door open & panel live)

    • No damage to external installation,

      Effect of a short circuit fault:

      Downtime to replace components/ rebuild starter will be significant


Type 2 coordination minimum performance required after a short circuit

Type 2 coordination- minimum performance required after a short circuit

  • Weld of contactor main contacts acceptable, provided weld is easily broken, and there must be:

    • No damage to the installation

    • No danger to personnel

    • No need to replace components

      Effect of a short circuit fault:

      Downtime reduced, compared to type 1 coordination Checking contactor main pole contacts ( breaking tack welds if necessary) & replacing fuse links where used is required


Total coordination is now a practical possibility

To achieve type 2 coordination selection of the correct components is vital!Proven Type 2 coordination is the minimum requirement to ensure safety- But technology has moved on……..

Total coordinationis now a practical possibility


Requirements for total coordination for compliance with bs en 60947 6 2

Requirements for Total Coordinationfor compliance with BS EN 60947-6-2

  • Starter must be a CPS (Control and Protective Switching) device.

  • No damage to starter assembly acceptable

  • Ongoing electrical life must be guaranteed

  • No damage to the installation acceptable

  • No danger to personnel acceptable

  • Equipment may immediately be reset and restarted, once short circuit fault removed

    Effect of a short circuit fault:

    Minimal downtime. -Removal of fault followed by resetting and restarting of equipment is all that is necessary


Telemecanique independently certified cps motor starters with total coordination

Telemecanique independently certified CPS Motor starters withTotal coordination

Single product solution

  • TeSys model U up to 32A

    Single product solution with diagnostics

  • Tesys model U with Multi- function module

    Single product solutions with AS-I capability

  • Tesys model U with AS-i module

    Single product solutions with diagnostics and full communications capabiilty

  • Tesys model U with Multifunction module and Modbus or Canbus coms module


Tesys model u provides unique benefits enabling maximisation of machine uptime

Tesys model U provides unique benefits enabling maximisation of machine uptime

  • Total coordination

    • Minimum downtime following fault

    • No damage to installation following a fault

    • No reduction in service life

    • Easier selection of correct components to ensure integrity of the installation

  • Diagnostics capability- Retention and downloading of data:

    • Last 5 trip occurences

    • Reason for trip- (short circuit or thermal)

    • Total no hours run

    • No of operations


Summary

Summary

  • Effective coordination of starter components is essential forsafety and minimum downtime following a short circuit fault

  • Type 1 coordination must be considered unacceptable for all but the simplest installations where downtime in the event of a fault is not critical

  • Type 2coordination can reduce downtime in the event of a short circuit fault, but requires careful selection of components

  • Totalcoordination virtually eliminates downtime due to short circuit faults. Selection of a CPS device is simple


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