CHAPTER 1.0 Overview
1-8
CDS7324 (FORMERLY LSF-0819)
Rev. A
INSTALLATION & USER’S MANUAL
1.5.4.1 RMS
Protection
The RMS protection acts to limit the current provided to the rated continuous current of the drive. Thus,
a G362-x006 cannot supply, on average, greater than 6Acontinuous RMS to the motor. The current to
the motor is averaged and if it exceeds the RMS rating, the drive limits the current command. If the
controller continuously demands current greater than the drive capability, the RMS protection will limit
the actual current supplied to the drive rating. The time for which peak current can be supplied is
dependent on whether the motor is stalled or running.
1.5.4.2 Thermal
Foldback
Thermal foldback is implemented in the DS2110 drives to prevent the junction temperatures of the
amplifier bridge IGBT’s exceeding their maximum rated temperature. The thermal foldback is based on
a measure of the heatsink temperature and the mode in which the drive is operating (motor running or
stalled). As the heatsink temperature increases, the peak current capability of the drive is reduced to
ensure the IGBT die temperature cannot increase above the device maximum rating.
For the DS2110 D size, a simple thermal shutdown is implemented. These drives will report an
overtemperature fault once the measured heatsink temperature exceeds the maximum rating of the
drive.
