Yaskawa DSD 406 - Manual (Page 74)

Fault/Error Possible Causes &
Code
Fault/Error Name
Corrective Actions
4 Maintenance
70 Troubleshooting Guide
3/21/96
Table 3. Troubleshooting Guide – Continued
902
(continued)
903
904
905
● Line Sync Loss Fault
Low Line Fault
Field Loss Fault
➊
Check wiring and repair as necessary.
❷
Check boards for shorts and replace as
necessary.
❸
a. Check output of 1PT
b. Check and replace fuses as necessary.
See “Replacing Fuse(s)”/Maintenance
Section.
c. Check wiring and repair as necessary.
d. Check transformer and replace as
necessary
❹
Replace DSD Power Supply. See
“Replacing the Power Supply”/
Maintenance Section.
1. Excessively noisy or intermittent
power connections.
2. Faulty voltage dividers on Armature
Interface PCB.
3. Loss of 3 phase or 1 phase power.
➊
Check power input for problems.
❷
Replace Armature Interface PCB. See
“Replacing Armature Interface
PCB”/Maintenance Section.
1. Power line dips.
a. 1 cycle below 50%.
b. 2 cycles below 70%.
c. 3 cycles below 80%.
2. Loss of power fuse.
➊
Check input power for problems.
❷
Check for blown fuses. See “Replacing
Fuse(s)”/Maintenance Section.
1. Motor field or wiring open.
2. a. Wrong trip level set.
b. Field Economy set too low.
➊
Check motor and wiring.
❷
a. Check trip level setting.
b. Change economy setting as required.