Rockwell Automation 2LW3000 LonWorks Communication Option Module for VTAC 7 Drives - Manual (Page 49)

Programming the Drive for Network Communication 6-3
P.062 Option Port: Communication Loss Response (continued)
If P.062 = 0
The drive will consider a loss of network communication to be a drive fault, resulting in
an IET-type stop sequence.
When P.062 is set to IET fault (0) and communication is lost:
• The drive latches a fault condition and performs a coast stop.
• The network communication loss fault is generated (nCL is displayed).
• The front panel REMOTE LED blinks, indicating that the network is inactive.
When network communication is re-established, you must reset the fault before the
drive can be re-started. See the VTAC 7 User Manual for information on resetting
faults. (A fault reset does not clear the error log.)
If P.062 = 1
The drive continues to operate, using the last reference received from the network.
The response to network communication loss is:
• The drive continues to operate, using the last reference received from the network
master.
• An entry is made into the drive’s error log for each active-to-inactive transition of
network communication status.
• The front panel REMOTE LED blinks, indicating that the network is inactive.
If network communication is re-established, the drive will again follow the reference
and sequencing control inputs supplied by the network. Note that if P.054 = ON and
the start and stop inputs are on (1), the drive will start.
Note that in this configuration, it might not always be possible to stop the drive over
the network.
!
ATTENTION: In volts/hertz regulation, if P.000 (Control Source) is set to
OP (Option Port), and P.062 is set to 1 (hold last reference), and the drive
loses communication with the network, the drive will maintain the last
frequency command sent to it. Ensure that drive machinery, all drive-train
mechanisms, and application material are capable of safe operation at
the maximum operating speed of the drive. Failure to observe this
precaution could result in bodily injury.
ATTENTION: When P.055 is set to ON , the STOP/RESET key is
functional only from the selected control source. As a safety precaution,
Rockwell Automation recommends that an emergency stop pushbutton
be located near the drive in an easily accessible location. As a further
safety precaution, the user should post a warning on the drive to alert
personnel that the
STOP / RESET key is not functional. Failure to observe
this precaution could result in severe bodily injury or loss of life.