Table of Contents
Advertisement
MSD Manual
Warning
Only qualified electricians should carry out all electrical installation and maintenance
work on the MotorShield™.
Disconnect all sources of power to the VFD and MotorShield™ before working on the
equipment. Do not attempt any work on a powered MotorShield™.
Reactor and Capacitor Thermal Switches
If the reactor thermal switch opens, it indicates that the MotorShield™ reactor is overheating. This
may be caused by the MotorShield™ being applied to a current that exceeds its ratings, a
switching frequency lower than its minimum specification, a motor frequency that exceeds
maximum specifications, or blocked air flow. Check to make sure current, drive switching
frequency, and drive output fundamental frequency meet product specifications. Check to make
sure ventilation openings are open and not blocked or clogged. Ensure reactor is not covered
with a thick layer of dirt and dust.
Evaluating MotorShield
The MotorShield
an oscilloscope.
This waveform illustrates typical drive output and filter input voltages when measured from line to
line.
Performance
™
performance can be evaluated by checking the output voltage waveform with
™
Figure 7: Motor Input Waveform Before MotorShield
6.0 Maintenance and Service
19
™
Advertisement
Table of Contents
