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Basic Installation and Operation Guide
PTC Thermistor Input
The TE Series starter is provided with input terminals for connecting a PTC (Positive Temperature
air receivers, oil or coolant reservoirs and air discharge systems that may require shutdown of the motor.
PTC Resistor Values:
The resistance must be less than or equal to 750 at 25ºC. If multiple resistors are used in the motor, the
sum of all resistors in series must equal or be less than this value.
Fault Signal
This output is permanently set to this function and is not programmable.
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TE Series Digital Solid State Soft Starters 18 – 1250A
Coefficient) Thermistor that may be imbedded in the motor. These
are specialized resistors imbedded in some motor windings that
increase in resistance as the temperature increases. When the
TE Series detects that the PTC input resistance is too high, it
initiates a PTC trip, and displays [PTc] on the readout. This is
independent of the Thermal Register overload current protection
and provides supplemental protection for high motor ambient
temperature applications. Terminals for this input are provided
with a factory jumper that must be removed if the PTC input is
used. These are Terminals 9 and 10 located on TB1.
PTC resistors are also found in other devices such as bearings,
An optically isolated Triac output is dedicated as a fault indicator
on TB1, terminals 11 and 12, labeled "Opto". The output Triac
switch is rated for 10 - 250VAC, 50 mA (maximum). If the three
programmable Output Auxiliary Relays are being used for other
functions, this output can easily be hooked up to a PLC or small
external relay to provide a Fault signal. This Fault Output
operation is permanently fixed at "Any Trip", duplicating the
Relay setting 16 as shown in Table 5.6.10 of the Advanced
Installation, Operation and Programming Manual.
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