Siemens MICROMASTER 420 - Manual (Page 138)

3 Functions Issue 07/04
MICROMASTER 420 Operating Instructions
138 6SE6400-5AA00-0BP0
Term. 5, 6
or 7
1 k Ω
5, 6
or 7
PNP digital input (P0725 = 1)
Term. 8 (24 V)
Term. 9 (0 V)
Term. 5, 6
or 7
12 k Ω
5, 6
or 7
NPN digital input (P0725 = 0)
Term. 9 (0 V)
Term. 8 (24 V)
R
PTC
≈ 900 Ω ⇒ DIN switches from "0" → "1"
Fig. 3-58 Connecting a temperature sensor to MICROMASTER 420
NOTE
The specified circuit examples apply for the PTC temperature sensor from the M11
Motor Catalog (motor protection using PTC thermistors, Code Z = A10 – A16) - that
is used for the 1LA and 1LG Siemens motors.
NOTE
In order to avoid noise from being coupled into the drive inverter electronics - with
the associated disturbances - none of the free conductors in the motor cable may
be used to connect the temperature sensor to the drive inverter. The temperature
sensor must be connected to the drive inverter using a separate cable (if possible,
using a shielded cable).