The most common temperature sensor types are PTC or Pt100.
For more information, see the firmware manual.
￭ Protecting the motor against overload without thermal model or
temperature sensors
Motor overload protection protects the motor against overload without using motor thermal
model or temperature sensors.
Motor overload protection is required and specified by multiple standards including the US
National Electric Code (NEC) and the common UL/IEC 61800-5-1 standard in conjunction
with UL/IEC 60947-4-1. The standards allow for motor overload protection without external
temperature sensors.
The protection feature allows the user to specify the class of operation in the same manner
as the overload relays are specified in standards UL/IEC 60947-4-1 and NEMA ICS 2.
The motor overload protection supports thermal memory retention and speed sensitivity.
For more information, see drive firmware manual.
Protecting the drive and the input power cable in
short-circuits
Protect the drive (1) with fuses (a) and the input cable with fuses (b) or a circuit breaker.
Size the fuses or the circuit breaker according to local regulations for the input cable
protection. Select the fuses for the drive according to the instructions given in the technical
data. The fuses for the drive protection will restrict drive damage and prevent damage to
adjoining equipment in case of a short-circuit inside the drive.
Note: Circuit breakers must not be used without fuses.
WARNING!
Due to the inherent operating principle and construction of circuit breakers,
independent of the manufacturer, hot ionized gases can escape from the breaker
enclosure in case of a short-circuit. To ensure safe use, pay special attention to
the installation and placement of the breakers. Obey the manufacturer’s instructions.
Protecting the drive against thermal overload
The drive has overload protection as standard.
Guidelines for planning the electrical installation 87
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