Motor-temperature monitoring of group drives

Question:
How can the motor temperature of group drives be monitored?

Answer:
The most Lenze inverters have only one input to the motor-temperature monitoring. If you want to monitor the temperature of e. g. 2 motors, there are two different possibilities:

1. Series connection of the motor-temperature monitoring (thermal contact or PTC) at the terminals T1 and T2.
2. Connect the motor-temperature monitoring (thermal contact or PTC) of motor 1 to the terminals T1 and T2. Connect the motor-temperature monitoring  (thermal contact or PTC) of motor 2 to the terminals 20 (+24 V DC) and e. g. E1 (digital input E1) and link the digital input E1 with the signal TRIP-SET.
In case of type 1 the error message does not give information about which motor has switched off with overtemperature. In case of type 2 this information can be seen from the error message (e. g. OH3 trip for motor 1 or EEr trip for motor 2).

Note:
At some drive controllers you can use two input parallel to connect temperatur sensors (e. g. Servo Drives 9400 HighLine from firmware 7.0, see Support for a second thermal sensor)

URL for linking this AKB article: https://www.lenze.com/en-de/go/akb/200500003/1/