Yaskawa VCD 723 - Manual (Page 65)

4 Troubleshooting/Maintenance
59 Troubleshooting Flowcharts
9/15/93
Troubleshooting
Flowcharts
If the VCD 723 malfunctions, locate the cause and take corrective action by
following the flowcharts in this section.
A. TROUBLESHOOTING MOTOR SYMPTOMS
Motor Does Not Rotate ................................................................... Chart 1
Motor Stalls During Operation ....................................................... Chart 2
Motor Does Not Rotate at Set Speed .............................................. Chart 3
Motor Hunting................................................................................. Chart 4
B. TROUBLESHOOTING FOR FAULT CONDITIONS
Overvoltage ...................................................................................... Chart 5
Blown Fuse ....................................................................................... Chart 6
Overcurrent....................................................................................... Chart 7
Overload ........................................................................................... Chart 8
Underload ......................................................................................... Chart 9
Inverter Overheated ........................................................................ Chart 10
Control Function Error ................................................................... Chart 11
External Fault ................................................................................. Chart 12
Power Supply Verification ............................................................. Chart 13
WARNING
Oscilloscope chassis may be at voltages potentially hazardous
to life if not properly grounded. If oscilloscope is used to
measure high voltage waveforms, use only a dual channel
oscilloscope in the differential mode with X100 probes.
Always connect oscilloscope chassis to earth ground.
WARNING
Voltages dangerous to life exist when equipment is open and
energized. Do not work alone.
CAUTION
To prevent equipment damage always remove incoming three-
phase power before test equipment is connected or removed.
Never disconnect or connect the wiring while the power is
applied.