Program features
44
Motor temperature measurement through the standard I/O
The figure below shows the temperature measurement options of one motor when
the RMIO is used as the connection interface.
WARNING! According to IEC 664, the connection of the motor temperature sensor
to the RMIO, requires double or reinforced insulation between motor live parts and
the sensor. Reinforced insulation entails a clearance and creeping distance of 0.315”
(8mm) (400 / 500 VAC equipment). If the assembly does not fulfil the requirement:
• The RMIO board terminals must be protected against contact and they may not
be connected to other equipment.
Or
• The temperature sensor must be isolated from the RMIO board terminals.
See also the section Motor Thermal Protection on page 38.
Motor
10 nF
(>
630 VAC)
RMIO board
One sensor
Three sensors
Motor
10 nF
(>
630 VAC)
RMIO board
T
AI1+
AI1-
AO1+
AO1-
T
T
T
AI1+
AI1-
AO1+
AO1-
The minimum voltage
of the capacitor
must be 630 VAC
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