Rockwell Automation 1336T FORCE Series B - Manual (Page 235)

Chapter 6
Troubleshooting
6–23
Inverter Diagnostics Result #2 (parameter 259) is defined as follows:
When this
bit is set (1):
Then:
0 Transistor U upper shorted.
1 Transistor U lower shorted.
2 Transistor V upper shorted.
3 Transistor V lower shorted.
4 Transistor W upper shorted.
5 Transistor W lower shorted.
6 The current feedback phase U offset is too large.
7 The current feedback phase W offset is too large.
8 Transistor U upper open.
9 Transistor U lower open.
10 Transistor V upper open.
11 Transistor V lower open.
12 Transistor W upper open.
13 Transistor W lower open.
14 Current feedback phase U open.
15 Current feedback phase W open.
If any hardware fault occurs during the open transistor testing, then the
following occur:
•
The hardware fault is saved.
•
A phase–to–phase fault is set.
•
All subsequent testing is stopped.
•
Some untested devices may be set as open.
Typically, you should fix the hardware faults and run open tests again to
determine if any opens exist.
What Do Open Transistor Faults Indicate?
Open transistor faults could indicate an open anywhere in the control or
power section that turns on a given transistor. You should check the
power transistor gate drive signal from the control board through the
cabling to the opto–isolators continuing through the gate drives and
finally through the cabling to the power transistor. This includes the
power wiring to the motor terminals and the motor. If the bus voltage is
too low, opens could occur; bus voltage should be greater than 85% of
nominal line.