Hardware Manual

86 Planning the electrical installation
Connecting a motor temperature sensor to the drive I/O
WARNING! IEC 60664 requires double or reinforced insulation between live
parts and the surface of accessible parts of electrical equipment which are
either non-conductive or conductive but not connected to the protective earth.
To fulfill this requirement, the connection of a thermistor (and other similar
components) to the digital inputs of the drive can be implemented in three alternate
ways:
1. There is double or reinforced insulation between the thermistor and live parts of
the motor.
2. Circuits connected to all digital and analog inputs of the drive are protected
against contact and insulated with basic insulation (the same voltage level as the
drive main circuit) from other low voltage circuits.
3. An external thermistor relay is used. The insulation of the relay must be rated for
the same voltage level as the main circuit of the drive. For connection, see the
firmware manual.
See section AI1 and AI2 as Pt100, Pt1000, PTC and KTY84 sensor inputs (XAI,
XAO) on page 109 or section DI6 (XDI:6) as PTC sensor input on page 111 for the
connections.
This table shows what sensor types you can connect to the drive I/O extension and
encoder interface modules. These modules require double or reinforced insulation
between live parts and the surface of accessible parts of electrical equipment
Note: The inaccuracy of the analog inputs on the drive control unit for Pt100 and
Pt1000 sensors is 10 °C (50 °F). If more accuracy is needed, use the FAIO-01 analog
I/O extension module (option +L525). It forms double insulation.
Option module Temperature sensor type
PTC KTY Pt100, Pt1000
FIO-11 - X X
FEN-xx X - -
FEN-11, FEN-21, FEN-31 X X -
FAIO-01 - X X