Rockwell Automation 2198-Hxxx Kinetix 5500 Servo Drives Installation Instructions - Manual (Page 18)

18 Kinetix 5500 Servo Drives
Rockwell Automation Publication 2198-IN001C-EN-P - January 2014
Motor Overload Protection
This servo drive uses solid-state motor overload protection that operates in accordance with
UL 508C. Motor overload protection is provided by algorithms (thermal memory) that predict
actual motor temperature based on operating conditions as long as control power is continuously
applied. However, when control power is removed, thermal memory is not retained.
In addition to thermal memory protection, this drive provides an input for an external
temperature sensor/thermistor device, embedded in the motor, to support the UL requirement
for motor overload protection.
Servo drives using DSL (digital servo link) encoder technology require the encoder to perform
motor temperature monitoring and transmit the data over the single motor cable. Kinetix VP
motors use DSL technology that performs this function. No additional wiring is required.
Some motors supported by this drive do not contain temperature sensors/thermistors; therefore,
motor overload protection against excessive consecutive motor overloads with power cycling is
not supported.
This servo drive meets the following UL 508C requirements for solid-state overload protection.
Refer to your servo drive user manual for the interconnect diagram that illustrates the wiring
between your motor and drive.
Motor Overload Protection Trip Point Value
Ultimately 100% overload
Within 8 minutes 200% overload
Within 20 seconds 600% overload
ATTENTION: To avoid damage to your motor due to overheating caused by excessive,
successive motor overload trips, follow the wiring diagram provided in the user manual for
your motor and drive combination.