ABB ACS880 Firmware Manual page 403

No. Name/Value
60.58 DDCS controller
comm loss time
0...60000 ms
60.59 DDCS controller
comm loss function
No action
Fault
Last speed
Speed ref safe
Fault always
Warning
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.
Notes:
• 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 AC800M 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
occurs if control is expected from the external controller.
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.
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.
Drive generates an A7CA DDCS controller comm loss
warning and sets the speed to the speed defined by
parameter 22.41 Speed ref safe
safe when frequency reference is being used). This only
occurs if control is expected from the external controller.
WARNING! Make sure that it is safe to continue
operation in case of a communication break.
Drive trips on 7581 DDCS controller comm
even though no control is expected from the external
controller.
Drive generates an A7CA DDCS controller comm loss
warning. This occurs only if control is expected from the
external controller.
WARNING! Make sure that it is safe to continue
operation in case of a communication break.
60.59 DDCS
is taken.
loss. This only
(or 28.41 Frequency ref
loss. This occurs
Parameters 403
Def/FbEq16
100 ms
-
Fault
0
1
2
3
4
5