Motor PTC Thermistors
Motor PTC Thermistors
(OP)
Our contract requirements requires even a 5.5kW LV Induction Motor to have PTC Thermistors in a separate terminal box. One of our motor vendors applies for waiver because their PTC Thermistor connection are inside the motor main terminal box (with the motor main terminals).
Is there any motor vendor who could provide such contractual requirement for 5.5kW LV Motor? Is there any set backs for making both motor terminal and the PTC Thermistors in one common Terminal Box?
Is there any motor vendor who could provide such contractual requirement for 5.5kW LV Motor? Is there any set backs for making both motor terminal and the PTC Thermistors in one common Terminal Box?
GO PLACIDLY, AMIDST THE NOISE AND HASTE-Desiderata





RE: Motor PTC Thermistors
My 2 cents.
RE: Motor PTC Thermistors
Nightfox, what exact purpose upon segragating such wire?
RE: Motor PTC Thermistors
I will inform the vendor to apply for a waiver and supply me of a technical justification (i.e. motor frame size is too small, not a manufacturing standard, etc.)
Thanks, your inputs provided me confidence...
GO PLACIDLY, AMIDST THE NOISE AND HASTE-Desiderata
RE: Motor PTC Thermistors
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Sometimes I only open my mouth to swap feet...
RE: Motor PTC Thermistors
RE: Motor PTC Thermistors
However, it is impractical to make a terminal box for PTC itself. The motor terminal box is enough to confine such tiny PTC terminal block. Consequently, in order to avoid such drawback as Sed pointed out; motor terminal box has blinded hole to cater for the installation of the conduit for PTC terminal only, as long as the motor you purchase has PTC.
RE: Motor PTC Thermistors
What might be suggested is to put a daughter box on the side of the main terminal box.
PTC operate much like solid state thermostats, and thier trigger is a steep resistance change. If you are using a sensor that uses an small voltage, or very small current differential (Thermocouples and RTDs) you may want to pay close attention to induced noise.
Hope this helps,