Toshiba 18 - 1250 A Benutzerhandbuch

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Appendix 5 (cont.) External OL Relay Applications 

Multiple Motors 
When more than one motor is connected downstream from the TE 
Series starter, the internal electronic overload protection cannot provide 
proper protection of the individual motors. Codes require the use of 
separate OLRs for each motor, which would need to be external 
devices. 

In these instances the TE Series Over Load protection should be turned 
off, deferring protection to the separate OLRs. Care should be taken to 
ensure that the External OLR is properly wired into the starter control 
circuit to facilitate shutdown of the motor. The TE Series provides a 
PTC input that can be wired to the NC auxiliary contact of the external 
OLR so that a trip will still shut down the TE Series and be annunciated 
on the display. Multiple OLRs would then be wired in series for the 
same effect. See section 4.7.2.a for details on using the PTC input.