ABB ACS880 Firmware Manual page 502

502 Parameters
No. Name / Range /
Selection
60.58 DDCS controller
comm loss time
0...60000 ms
60.59 DDCS controller
comm loss function
No action
Fault
Last speed
Description
Sets a timeout for communication with the external
controller.
If a communication break lasts longer than the timeout,
the action specified by parameter
controller comm loss function
As a rule of thumb, this parameter should be set to at
least 3 times the transmit interval of the controller.
Note:
• There is a 60-second boot-up delay immediately
after power-up. During the delay, the
communication break monitoring is disabled (but
communication itself can be active).
• With an AC 800M controller, the controller detects
a communication break immediately but
re-establishing the communication is done at
9-second idle intervals. Also note that the sending
interval of a data set is not the same as the
execution interval of the application task. On
ModuleBus, the sending interval is defined by
controller parameter Scan Cycle Time (by default,
100 ms).
Timeout for communication with external controller.
Selects how the drive reacts to a communication break
between the drive and the external controller.
No action taken (monitoring disabled).
Drive trips on 7581 DDCS controller comm
only occurs if control is expected from the external
controller, or if supervision is forced using parameter
60.65 DDCS controller comm supervision
Drive generates an A7CA DDCS controller comm loss
warning and freezes the speed to the level the drive
was operating at. This only occurs if control is expected
from the external controller, or if supervision is forced
using parameter 60.65 DDCS controller comm
supervision force.
The speed is determined on the basis of actual speed
using 850 ms low-pass filtering.
WARNING!
Make sure that it is safe to continue operation
in case of a communication break.
60.59 DDCS
is taken.
loss. This
force.
Def / Type
FbEq 16b / 32b
100 ms / uint16
- / -
Fault / uint16
0
1
2