APPENDIX D (Continued)
(1) Any moisture or debris (metal shavings for
example) inside the equipment.
(2) Damage or dents to the enclosure, damaged or
loose components and wires, and disconnected terminal conectors.
(3) Possible restrictions to airflow at the
cooling fans or heat sink.
(4) Unremoved shipping blocks or tapes at power
b) In addition to the VFD itself, you should also make
a visual inspection of the entire system, including motors,
disconnect switches, circuit breakers, controls, load components,
control devices (limit, float, pressure switches, etc.).
c) Finally, you should make an intense and thorough
check of the following items:
Connections (line, load, and ground).
VFD (input/output voltages, maximum output
(4) Protective devices (circuit breaker, fuses,
Disconnects (are they in place and sized
(6) Incoming line power voltage measurements to
the VFD (A-B phase, B-C phase, C-A phase).
d) It is recommended that you use a VFD start-up guide
sheet/report in your start-up procedure. Make the report part of
the project's contractual requirements within the specification
section covering the VFD. The benefits of using such a report
includes verifying key parameters prior to start-up, documenting
the installation for warranty claims, and aiding in
troubleshooting for future problems. The following instruments
should be available at the VFD location for start-up: