Yaskawa DSD 406 - Manual (Page 68)

Fault/Error Possible Causes &
Code
Fault/Error Name
Corrective Actions
Table 3. Troubleshooting Guide – Continued
4 Maintenance
64 Troubleshooting Guide
3/21/96
97
(continued)
98
99
100
101
102
103
Tach Loss Trip
Reverse Tachometer Connection
Not a Number
Math Overflow
Math Underflow
Floating Point Divide By Zero
➏
This fault could be caused by this motor
being pulled along by the load.
➐
Try running this DC drive in voltage
feedback to see if this fault still occurs.
This fault is declared by the TMON_0 PAC
block.
➊
This fault may be set too sensitive. On a
DC drive increase the setting of Function
42, “Volt Sense Level”, to 20 and
increase the setting of Function 43, “Tach
Sense Level”, to 15.
❷
Check tach wiring for loose or improper
connections both at tach and at drive.
❸
Check for a loose, damaged, or slipping
tach coupling.
❹
Try running this DC drive in voltage
feedback to see if this fault still occurs.
This fault is declared by the TMON_0 PAC
block.
➊
Correct tach wiring at drive or at tach.
❷
Try running this DC drive in voltage
feedback to see if this fault still occurs.
PAC Block Math Error
➊
If any of these faults occurs a few times
on powerup, then it can be ignored if the
drive is operating properly. The purpose
of these faults is to assist in checking new
code. Disable the unnecessary fault by
using Function 801/See “Error Handling
& Reporting”/Operation Section. Remove
this fault
from both the fault list and the error list.
❷
If any of these errors occur at times other
than powerup, or if the drive is not
operating properly, then the drive’s PAC
code should be reviewed. The fault
producing Block can be identified by
accessing the Error or Fault Lists.