76 Guidelines for planning the electrical installation
1)
Suitable for use in safety functions (SIL2 / PL c rated)
Connection of motor temperature sensor to the drive via a relay
PTC alternative A. This table shows the insulation requirement for a customer’s external
relay, and the insulation requirement for the sensor to fulfill decisive voltage class A
(double insulation) of IEC 60800-5-1.
PTC alternative B
. Decisive voltage class B of IEC 60800-5-1 (basic insulation) is provided
with a 6 kV relay. Circuits connected to all motor protection relay inputs and outputs must
be protected against direct contact.
Pt100 alternative A.
This table shows the insulation requirement for a customer’s external
relay, and the insulation requirement for the sensor to fulfill decisive voltage class A
(double insulation) of IEC 60800-5-1.
Pt100 alternative B
. Decisive voltage class B of IEC 60800-5-1 (basic insulation) can be
achieved when there is basic insulation between the sensor and live parts of the motor.
Circuits connected to all motor protection relay inputs and outputs must be protected
against direct contact.
Example circuit diagram
See page 215.
FAIO-01 Basic insulation between sensor
connector and drive control unit
connector. No insulation between
sensor connector and other I/O
connectors.
X X X Basic insulation. Connectors
of extension module other
than sensor connector must
be left unconnected.
FPTC-
xx
1)
Reinforced insulation between sensor
connector and other connectors
(including drive control unit
connector).
X - - No special requirement
PTC relay Temperature sensor insulation requirement
Type Insulation
External relay Basic insulation 6 kV Basic insulation
Pt100 relay Temperature sensor insulation requirement
between sensor and live parts of motor
Type Insulation
External relay Basic insulation 6 kV Basic insulation
Option module Temperature sensor
type
Temperature sensor
insulation requirement
Type Insulation/Isolation PTC KTY Pt100,
Pt1000
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