SLX9000 Adjustable Frequency Drives User Manual
MN04003020E
For more information visit: www.eaton.com 4-9
January 2009
Motor Thermistor (PTC) Connection
There are three ways to connect a PTC resistor to SLX9000.
1. With optional board OPTAI (recommended method).
SLX9000 drive equipped with OPTAI fulfills IEC 664 if the motor thermistor is insulated
(= effective double insulation).
2. With optional board OPTB2.
SLX9000 drive equipped with OPTB2 fulfills IEC 664 if the motor thermistor is insulated
(= effective double insulation).
3. With the digital input (DIN3) of SLX9000 drive.
The DIN3 is galvanically connected to other I/Os of SLX9000. This is why reinforced or
double insulation of the thermistor (IEC 664) is absolutely required outside the drive (in
the motor or between the motor and the drive).
Figure 4-6: Motor Thermistor (PTC) Connection
Note: The drive trips when PTC impedance exceeds 4.7 kΩ.
We strongly recommend the use of OPTAI or OPTB2 board for motor thermistor connection.
WARNING
If the motor thermistor is connected to DIN3, the instructions above
must be followed, otherwise a serious safety hazard may result
from the connection.
+24V (Terminal 6)
DIN3 (Terminal 10, Part 2.1.18 = 14)
External PTC Risistor
External Risistor
4.7 kΩ to 5.6 kΩ
GND (Terminal 11)
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