Rockwell Automation 1336T FORCE Series B - Manual (Page 223)

Chapter 6
Troubleshooting
6–11
!
ATTENTION: If you are using an external logic power
supply, the drive may be able to stay in an indefinite
ridethrough state. If the power returns to the drive (much
later), the drive automatically restarts. You must therefore
handle the control of enable, faults, time–outs, drive
configuration, and safety issues at the system level.
Use the following parameters to configure the precharge and ridethrough
functions:
•
CP Fault / Warning Configuration Select (parameter 86)
•
CP Warning / None Configuration Select (parameter 87)
•
Precharge / Ridethrough Selection (parameter 223)
•
Undervoltage Setpoint (parameter 224)
In addition, Test Select 1 (parameter 93) and Test Data 1 (parameter 92)
contain software testpoints that provide additional precharge information.
Configuring the Faults and Warnings for Precharge
You can use CP Fault / Warning Configuration Select and CP Warning /
None Configuration Select to enable fault/warning conditions when the
appropriate bit is set (1). If a bit is clear (0) in CP Fault/ Warning
Configuration Select, you can choose to have the condition reported as a
warning by setting the bit in CP Warning / None Configuration Select.
The following are the bits that pertain to precharge:
This
bit:
With this text: When set, generates a fault when:
0 RidethruTime
The ridethrough time exceeds 2 seconds
(default see P226).
1 Prechrg Time
The precharge time exceeds 30 seconds
(default see P225).
2 Bus Drop
The bus voltage drops 150 volts below the
bus tracker voltage. This is the level where
the drive would normally enter ridethrough.
3 Bus Undervlt
The bus voltage drops below the level set in
Undervoltage Setpoint (parameter 224). This
is the level where the drive would enter
ridethrough if it occurs before a 150 volt drop
in bus voltage.
4 Bus Cycles>5
At least 5 ridethrough cycles have occurred
within a 20 second period. This indicates a
converter problem or a problem with
incoming power. Consider checking the
incoming power for a phase loss.