SLX9000 Adjustable Frequency Drives User Manual
MN04003020E
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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 k
Ω
.
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)
Summary of Contents for Cutler-Hammer SLX9000 Series
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