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Implementing a motor temperature sensor connection
WARNING!
IEC 61800-5-1 requires double or reinforced insulation between live parts and
accessible parts when:
•
the accessible parts are not conductive, or
•
the accessible parts are conductive, but not connected to the protective earth.
Obey this requirement when you plan the connection of the motor temperature
sensor to the drive.
You have these implementation alternatives:
1.
If there is double or reinforced insulation between the sensor and the live parts of the
motor: You can connect the sensor directly to the analog/digital input(s) of the drive.
See the control cable connection instructions. Make sure that the voltage does not
exceed the maximum allowed voltage over the sensor.
2.
If there is basic insulation between the sensor and the live parts of the motor, or if the
insulation type is not known: You can connect the sensor to the drive via an option
module. The sensor and the module must form a double or reinforced insulation between
the motor live parts and the drive control unit. See
sensor to the drive through an option module (page
does not exceed the maximum allowed voltage over the sensor.
3.
If there is basic insulation between the sensor and the live parts of the motor, or if the
insulation type is not known:You can connect a sensor to a digital input of the drive via
an external relay. The sensor and the relay must form a double or reinforced insulation
between the motor live parts and the digital input of the drive. Make sure that the voltage
does not exceed the maximum allowed voltage over the sensor.
Connecting a motor temperature sensor to the drive through an option
￭
module
This table shows:
•
option module types that you can use for the motor temperature sensor connection
•
insulation or isolation level that each option module forms between its temperature
sensor connector and other connectors
•
temperature sensor types that you can connect to each option module
•
temperature sensor insulation requirement in order to form, together with the insulation
of the option module, a reinforced insulation between the motor live parts and the drive
control unit.
Option module
Type
Insulation/Isolation
FIO-11
Galvanic isolation between sensor
connector and drive control unit con-
nector. No isolation between sensor
connector and other I/O connectors.
Guidelines for planning the electrical installation 91
Connecting a motor temperature
91). Make sure that the voltage
Temperature sensor type
PTC
KTY
Pt100,
Pt1000
x
x
x
Temperature sensor insu-
lation requirement
Reinforced insulation
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