text: <s>[INST] Powerflex 700 PTC using Siemens 1PH7 motor I am using a Powerflex 700 to control a Siemens 1PH7 motor. The 1PH7 has a KTY 84 thermistor PTC. According to the Powerflex 700 user manual the HW PTC input (terminals 10 and 23) are for a 1.8k ohm PTC sensor. The Siemens documentation shows the KTY 84 is a resistance vs. temperature curve starting at 500 ohm at 0 C and going to 2.6k ohm at 300 C.The KTY 84 PTC will read 1.8k ohm at approx. 200 C. Does the Powerflex drive PTC input match the characteristics of the KTY 84 sensor? I can't find any information on the PTC input in the usermanual as far as when it alarms, faults, etc... [/INST] Here from the User Manual: The PTC is connected to either the dedicated PTC input (PF700VC only) or Analog input 1 along with a pull-up resistor of 3.32k ohms Operation is the same for both modes. Here from the Reference Manual: Alarm Operation An alarm will occur when the PTC resistance increases above 3230 ohms (5V DC), but must decrease below 2153 ohms (4Vdc) for the alarm condition to clear. Fault Operation A fault will occur when the PTC resistance increases above 3230 ohms (5V DC), and must be cleared (reset) by a fault clear command, after the resistance has decreased below 3230 ohms (5V DC). The drive will also fault if the PTC voltage drops below 0.2V DC, indicating a shorted PTC. See also Aid 29443. - fuzzy logic \\n </s>