Hello all,
I am using a Sinamics G120 CP 240E-2 PN-F control unit to drive a Siemens 1LE10030DA222AB4 3-phase 1hp (0.75kW) motor. The motor has a sticker saying "Umax 30V DC PTC Thermistor". I have connected the 2TP motor terminals 1 & 2 inside the terminal box, which I am assuming are from the PTC, to the Control Unit inputs 14 and 15, labeled T1 Motor and T2 Motor. I configured the setup to use a PTC in the basic commissioning wizard of the drive. I do not get a fault since the resistance is just above the 20 ohms for a short circuit alarm, but the monitored motor temperature is a constant -200C. I have measured the resistance of the motor PTC thermistor and get a measured 75.5 ohms.
Am I doing something incorrectly? Any ideas why I'm not getting the correct resistance/ motor temperature reading?
Thanks for any reply.
I am using a Sinamics G120 CP 240E-2 PN-F control unit to drive a Siemens 1LE10030DA222AB4 3-phase 1hp (0.75kW) motor. The motor has a sticker saying "Umax 30V DC PTC Thermistor". I have connected the 2TP motor terminals 1 & 2 inside the terminal box, which I am assuming are from the PTC, to the Control Unit inputs 14 and 15, labeled T1 Motor and T2 Motor. I configured the setup to use a PTC in the basic commissioning wizard of the drive. I do not get a fault since the resistance is just above the 20 ohms for a short circuit alarm, but the monitored motor temperature is a constant -200C. I have measured the resistance of the motor PTC thermistor and get a measured 75.5 ohms.
Am I doing something incorrectly? Any ideas why I'm not getting the correct resistance/ motor temperature reading?
Thanks for any reply.