Toshiba 18 - 1250 A Benutzerhandbuch

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Your TE Series starter comes equipped with a very intelligent internal 
electronic overload protection system, and does not need an external 
Over Load Relay (OLR). There are instances however where external 
OLRs are needed or desired because of the application. These fall into 
three categories; Higher Level Protection systems, Redundant Backup 
applications and Special Motor applications. 
 
ƒ  NOTE:  

If the Decel Function is activated (F024), additional consideration 
must be put into determining how the starter is to operate in the 
event of an Over Load Trip. See Section 5.6.5 for issues regarding 
this application. 

 
 
HIGHER LEVEL PROTECTION SYSTEMS 
Because of a desire for uniformity and/or operator familiarity in some 
facilities, Motor Protection Relays or other coordinated OEM protection 
systems may be used in lieu of the TE Series protection (even though 
most of the features are the same or better). In these instances the TE 
Series Over Load protection can simply be turned off, deferring 
protection to the external devices. Care should be taken however to 
ensure that the external device 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 aux contact of the external 
device so that a trip will still shut down the TE Series and be 
annunciated on the display. See section 4.7.2.a for more details on 
using the PTC input.  

 
 
REDUNDANT BYPASS STARTER APPLICATIONS: 
In some applications, it may be necessary to provide an independent 
means of starting and protecting the motor should be TE Series starter 
become inoperable. If this were the case, the Bypass Contactor could 
be used for Across-the-Line (D.O.L) starting of the motor. The TE…BP 
version with Integral Bypass Contactors is designed for that possibility, 
as long as the starter is properly selected when ordered. To do so, 
select the starter based upon the ATL (Across-the-Line) selection chart 
so that the contactor is rated for ATL duty instead of the normal Shunt 
Duty (see section 1.2.3 for Selection charts).  
 
Under normal operations, the Bypass Contactor is controlled internally 
by the TE Series PC board and an internal pilot relay. For redundant 
backup purposes however, terminals B1 and B2 of TB4 are provided for 
field connection of a dry contact closure in parallel to the pilot relay 
contact, allowing control even if the electronics are out of service. AC 
control power must still be applied to TB2 terminals A1 and A2, but no 
other electronics or power supplies need to be functioning. It is in this 
instance that an external OLR must be added to the motor power circuit 
and wired into that coil control circuit. TB4 is located in different areas of 
each frame size in the TE Series. Refer to the following diagram for the 
location on your unit.