Protection and Control
The M60 motor protection system offers
comprehensive protection and control
solutions for medium to large-sized
three-phase motors. The M60 includes
advanced automation and communication
capabilities, extensive I/O options, and
powerful fault recording features that can
simplify postmortem fault analysis and
help minimize motor downtime. As part
of the Universal Relay (UR) family, the M60
provides superior protection and control
that includes:
Motor Thermal Model
The M60 features an enhanced motor
thermal model consisting of the following
elements:
• Thermal limit curves - NEMA standard,
voltage dependent and customized
• IEC 60255-8 thermal overload curves
• Current unbalance biasing
• Independent running and stopped
exponential cooling curves
• Optional RTD biasing of the thermal
model to adapt to real-time
temperature measurements
• Compensation for hot/cold motor
conditions
The M60 thermal model integrates both
stator and rotor heating and cooling into
a single model.
FlexCurves™
For applications that require greater
flexibility, FlexCurves can be used to define
custom curve shapes. These curves can
be used to protect motors with different
rotor and stator damage curves, allowing
complete protection over the total motor
capacity.
Overtemperature Protection
The M60 supports up to 16 programmable
RTD inputs that allow for the configuration
of the alarm and trip temperature of each
RTD, detecting RTD shorting conditions,
and selecting RTD voting that requires
more than one RTD to detect an over
temperature condition before it will issue a
trip command.
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