Motor temperature monitoring with PTC or third-party sensor

Question:

How can motor temperature be monitored if no KTY temperature sensor as per Lenze standard is installed?

Answer:

There are two possibilities:

1. You install a linear temperature sensor (KTY) which has a different characteristic from that of KTY Sensor 83-110 installed by Lenze. Then you must set the resistances and associated temperatures in the drive controller. This is conducted with the aid of codes C1190, C1191 and C1192. Based on the resulting linear characteristic the drive controller evaluates the motor temperature. You will find further information in the operating instructions of servo inverter 9300, section 4.2.9.1: 'User-specific characteristic for a continuous temperature sensor'.
2. You install a PTC temperature sensor with a defined cutout temperature. Connect it to terminals T1 and T2, which are directly next to the power output terminals. The controller evaluates 'motor temperature rise' as soon as the resistance exceeds a level of 1,600 ohms. You will find information on DIN conformity in the operating instructions of the servo inverter 9300, section 4.2.9: 'Motor temperature rise monitoring'. One must bear in mind that in such a case monitoring functions OH3 (C0583 = 3) and OH7 (C0584 = 3) have to be deactivated.

URL for linking this AKB article: https://www.lenze.com/en-de/go/akb/20010133/1/