M Butler July 05 Division - Name - Date - Language 1

Motor Starter Coordination

-Implications-Benefits

M Butler July 05 Division - Name - Date - Language 2

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

M Butler July 05 Division - Name - Date - Language 3

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

M Butler July 05 Division - Name - Date - Language 4

BS/EN 60947-4-1 minimum requirements:

Allows damage to allcomponents 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)

Type 2 coordination

Type 1 coordination

M Butler July 05 Division - Name - Date - Language 5

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

M Butler July 05 Division - Name - Date - Language 6

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

M Butler July 05 Division - Name - Date - Language 7

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 coordination is now a practical possibility

M Butler July 05 Division - Name - Date - Language 8

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

M Butler July 05 Division - Name - Date - Language 9

Telemecanique independently certified CPS Motor starters with Total 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

M Butler July 05 Division - Name - Date - Language 1

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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

M Butler July 05 Division - Name - Date - Language 1

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Summary

Effective coordination of starter components is essential for safety 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 2 coordination can reduce downtime in the event of a short circuit fault, but requires careful selection of components

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