Rockwell Automation FlexPak 3000 Digital DC Drive Version 4.3 - Manual (Page 108)

10-2 FlexPak 3000 DC Drive Software Reference
10.1 Configuration for All Networks
NETW COMM LOSS SELECT
(P.901)
Selects how the drive
will respond to
network
communication loss
when
CONTROL
SOURCE SELECT is set
to NETWORK .
Parameter Range: FAULT
USE LAST REF
USE TRMBLK REF
4 = USE TRMBLK CNTL
Default Setting: FAULT
Parameter Type: Tunable
OIM Menu Path(s): Network Communications
The choices are:
•
FAULT : A fault is generated when network communication is lost, causing the drive
to coast/DB stop.
•
USE LAST REF : The drive continues to run if network communication is lost, using
the last reference value received over the network. The alarm A00004, NETWORK
COMMUNICATION TIMEOUT , is generated if network communication is lost.
•
USE TRMBLK REF : The drive continues to run if network communication is lost,
using the selected auto reference value from the Regulator board terminal strip
(terminals 19 and 20). The drive automatically switches back to the network
reference when network communication is re-established. The alarm A00004,
NETWORK COMMUNICATION TIMEOUT , is generated if network communication is lost.
• 4 ( USE TRMBLK CNTL ): The drive continues to run if network communication is lost.
The Regulator board terminal strip will become the source for all control (Run,
Jog, Stop, Fault Reset, Direction, and OCL Enable) and speed (auto) reference
signals. The Speed Loop PI Reset and Underwind/Overwind bits cannot be
changed while operating in this mode. They will remain at the last values received
from the network. The drive automatically switches back to the network reference
and control when network communication is re-established. Alarm A00004,
NETWORK COMMUNICATION TIMEOUT , is generated if network communication is lost.
This selection is available only when the ControlNet Network Communication
board is installed in the drive.
Alarms do not cause the drive to stop. Therefore, some form of hardwired stop must
be available in case of network communication loss, since stopping the drive
through the network might not be possible. Once the drive is stopped, it cannot be
restarted until network communication is re-established or
CONTROL SOURCE SELECT
is changed to something other than NETWORK .
If CONTROL SOURCE SELECT is not set to NETWORK , the loss of network
communication does not affect operation of the drive.
Important: The stop button on the OIM is aways functional, regardless of the vlaue
of this parameter.
!
ATTENTION: When USE TRMBLK REF or USE TRMBLK CNTL are selected,
motor speed and direction changes can occur when network
communication is lost and restored. All terminal block reference and
control signals must be set to correct values for your application. Failure
to observe this precaution could result in damage to, or destruction of,
equipment.